WO2015046440A1 - 解析装置、顕微鏡装置、解析方法、及びプログラム - Google Patents
解析装置、顕微鏡装置、解析方法、及びプログラム Download PDFInfo
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B21/00—Microscopes
- G02B21/36—Microscopes arranged for photographic purposes or projection purposes or digital imaging or video purposes including associated control and data processing arrangements
- G02B21/365—Control or image processing arrangements for digital or video microscopes
- G02B21/367—Control or image processing arrangements for digital or video microscopes providing an output produced by processing a plurality of individual source images, e.g. image tiling, montage, composite images, depth sectioning, image comparison
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
- G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
- G01N21/64—Fluorescence; Phosphorescence
- G01N21/645—Specially adapted constructive features of fluorimeters
- G01N21/6456—Spatial resolved fluorescence measurements; Imaging
- G01N21/6458—Fluorescence microscopy
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B21/00—Microscopes
- G02B21/16—Microscopes adapted for ultraviolet illumination ; Fluorescence microscopes
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/56—Optics using evanescent waves, i.e. inhomogeneous waves
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/58—Optics for apodization or superresolution; Optical synthetic aperture systems
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- G—PHYSICS
- G06—COMPUTING OR CALCULATING; COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T7/00—Image analysis
- G06T7/10—Segmentation; Edge detection
- G06T7/11—Region-based segmentation
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- G—PHYSICS
- G06—COMPUTING OR CALCULATING; COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T7/00—Image analysis
- G06T7/90—Determination of colour characteristics
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- G—PHYSICS
- G06—COMPUTING OR CALCULATING; COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T2207/00—Indexing scheme for image analysis or image enhancement
- G06T2207/10—Image acquisition modality
- G06T2207/10056—Microscopic image
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- G—PHYSICS
- G06—COMPUTING OR CALCULATING; COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T2207/00—Indexing scheme for image analysis or image enhancement
- G06T2207/10—Image acquisition modality
- G06T2207/10064—Fluorescence image
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- G—PHYSICS
- G06—COMPUTING OR CALCULATING; COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T2207/00—Indexing scheme for image analysis or image enhancement
- G06T2207/20—Special algorithmic details
- G06T2207/20021—Dividing image into blocks, subimages or windows
Definitions
- the present invention relates to an analysis apparatus, a microscope apparatus, an analysis method, and a program.
- This application claims priority based on Japanese Patent Application No. 2013-200705 filed on September 27, 2013, the contents of which are incorporated herein by reference.
- STORM Stochastic Optical Reconstruction Microscopy
- STORM Stochastic Optical Reconstruction Microscopy
- an observation sample a fluorescent substance having a characteristic of being activated when irradiated with an activation light having a predetermined wavelength and subsequently emitting fluorescence when inactivated with an excitation light having a wavelength different from the activation light, or the fluorescence A substance to which a substance is attached is used.
- the fluorescent material By irradiating such an observation sample with weak activation light, the fluorescent material is activated at a low density, and thereafter, excitation light is irradiated to cause the fluorescent material to emit light, thereby obtaining a fluorescent image.
- the fluorescent luminescent spots (fluorescent substance images) are arranged at low density and are separated individually, so that the position of the center of gravity of each image can be obtained.
- a high-resolution sample image can be obtained by repeating such a step of obtaining a fluorescent image a plurality of times, for example, several hundred times to several tens of thousands times or more, and performing image processing for synthesizing the obtained plurality of fluorescent images. .
- An analysis apparatus is an analysis apparatus for quantifying the state of a fluorescent image including a plurality of bright spots, and is set according to the positions of the plurality of bright spots in the fluorescent image.
- An area setting unit that quantifies the state of the bright spot included in a plurality of areas as a numerical value is provided.
- a microscope apparatus includes a sample image generation apparatus that generates a fluorescent image including the plurality of bright spots by expressing the position of the fluorescent substance image included in the acquired fluorescent image as a bright spot. .
- An analysis method is an analysis method for quantifying a state of a fluorescent image including a plurality of bright spots, and is set according to positions of the plurality of bright spots in the fluorescent image.
- One aspect of the present invention provides a computer of an analysis apparatus for quantifying a state of a fluorescent image including a plurality of bright spots, and a plurality of regions set according to the positions of the plurality of bright spots in the fluorescent image.
- An analysis apparatus is an analysis apparatus for quantifying a state of a fluorescent image including a plurality of bright spots, and is included in each of a plurality of predetermined regions in the fluorescent image.
- a region setting unit that quantifies the state of the bright spot as a numerical value.
- an outline of an analysis method for quantitatively analyzing a moving object such as a living cell is shown.
- an analysis technique for quantitatively analyzing the state of cells from continuously observed fluorescence images In the conventional analysis method, the fluorescence image acquired with the pixel of the light receiving element as the smallest unit of space is handled, so the intensity distribution information of the fluorescence image (such as the intensity distribution of the fluorescence generated from the fluorescent substance contained in the observation sample) Is assigned to the smallest space unit of “pixel” and quantitatively uses the four values of the intensity value (fluorescence intensity) between the pixels (or between pixels), that is, uses the pixel intensity value (fluorescence intensity) of the image (or between images). It was possible to perform the four arithmetic operations.
- Ratio also referred to as “PB ratio (peak to background ratio)” or FRAP (after light fade)
- FRET fluorescence resonance energy transfer
- STORM Stochastic Optical Reconstruction Microscopy
- a general STORM can obtain a high-resolution sample image, but generates a sample image based on the fluorescent bright spots in a plurality of fluorescent images discretely detected on the time axis. In order to obtain one sample image, a plurality of fluorescent images detected in a predetermined period are required.
- STORM calculates the position of the fluorescent bright spot from the luminance distribution in the fluorescent image by calculation. In short, STORM increases the resolution indicating the position of the fluorescent luminescent spot by calculating the position based on the information obtained by optically obtaining the position of the fluorescent luminescent spot.
- a general STORM calculates the position of a fluorescent bright spot from a plurality of fluorescent images detected at different times in order to obtain one sample image.
- it is known to increase the resolution of the obtained sample image by increasing the number of fluorescent images.
- the STORM of the type that calculates the position of the fluorescent luminescent spot stochastically based on the luminance distribution, if the number of fluorescent images is increased to increase the resolution, the time for obtaining one sample image becomes longer. The calculation load increases. Conversely, if the number of fluorescent images is reduced in an attempt to shorten the interval for obtaining the sample image, the necessary resolution cannot be obtained.
- the following high-resolution sample image analysis method obtains a plurality of fluorescent images including bright spots due to excitation light irradiated on the sample, and shows the positions of the bright spots calculated from image information indicating the fluorescent images Based on the analysis.
- a predetermined area including the position of the bright spot is set as an area corresponding to the bright spot based on the position information calculated as the position of the bright spot in the sample image.
- FIG. 1 is a schematic view showing a microscope apparatus according to this embodiment.
- the microscope apparatus 10 includes a light source 12, a control unit 14, a microscope main body 15, a storage unit 16, and a display unit 17.
- the microscope apparatus 10 is a microscope apparatus using super-resolution microscope technology (Stochastic Optical Reconstruction Microscopy; STORM).
- the microscope apparatus 10 uses a sample provided with a fluorescent substance that emits fluorescence and deactivates when irradiated with excitation light L1 in an activated state.
- This fluorescent substance has a characteristic that it becomes inactivated again when it is irradiated with activation light L2 having a wavelength different from that of the excitation light L1 after it is inactivated by emitting fluorescence when irradiated with the excitation light L1. is doing.
- the operation movement which observes the fluorescence distributed discretely by making only the one part fluorescent substance in a sample light-emit using excitation light L1 and activation light L2, and many fluorescence images acquired by this are repeated. To form a sample image.
- the light source 12 includes an excitation illumination system 11 and an activation illumination system 13.
- the excitation illumination system 11 includes a laser light source 21, a shutter 22, and a total reflection mirror 32, and the excitation illumination system 11 and the microscope main body 15 are connected via the total reflection mirror 32.
- the laser light source 21 is a light source that supplies excitation light L1 for causing the fluorescent material applied to the sample to emit light to the microscope body 15.
- the laser light source 21 only needs to emit excitation light L1 having a wavelength suitable for the fluorescent material included in the sample. For example, a green laser (wavelength 532 nm), a red laser (wavelength 633 nm) depending on the type of the fluorescent material. , 657 nm), a violet laser (wavelength 405 nm), a blue laser (wavelength 457 nm), or the like.
- the shutter 22 is a device that switches between supply and stop of the excitation light L1 to the microscope body 15.
- a light shielding member that shields the excitation light L1 emitted from the laser light source 21, and an optical path of the excitation light L1 through the light shielding member. It can be set as the structure provided with the drive device made to advance / retreat with respect to.
- an AOTF Acoustic-Optic Tunable Filter
- the total reflection mirror 32 is for totally reflecting the excitation light L1 emitted from the laser light source 21 toward the stage 31 of the microscope main body 15 to be described later. Based on such a configuration, the excitation illumination system 11 irradiates the entire area of the observation visual field (observation region) on the stage 31 with the excitation light L1.
- the activation illumination system 13 includes a laser light source 42, a scanner 43, and a dichroic mirror 33, and the dichroic mirror 33 is inserted into the optical path of the excitation light L1, thereby enabling the activation illumination system 13 and The microscope main body 15 is connected.
- the dichroic mirror 33 is for reflecting the activation light L ⁇ b> 2 emitted from the laser light source 42 toward the stage 31 and transmitting the excitation light L ⁇ b> 1 toward the stage 31.
- the laser light source 42 irradiates the microscope main body 15 with the activation light L2 for activating the fluorescent material.
- the laser light source 42 only needs to emit the activation light L2 having a wavelength suitable for the fluorescent material included in the sample.
- a green laser wavelength 532 nm
- a red laser wavelength depending on the type of the fluorescent material.
- 633 nm, 657 nm a violet laser (wavelength 405 nm), a blue laser (wavelength 457 nm), or the like can be used.
- the scanner 43 scans the activation light L2 on the stage 31 of the microscope main body 15.
- a biaxial galvano scanner can be used.
- the activation illumination system 13 can irradiate the observation light field (observation region) on the stage 31 while scanning the activation light L ⁇ b> 2 by the scanner 43.
- a laser light source device that includes the laser light source 21 and the laser light source 42 in one housing and is configured to emit a plurality of types of laser light may be employed.
- an illumination system including the shutter 22 and the scanner 43 is configured together with the laser light source device, so that both the excitation light L1 and the activation light L2 are transmitted to the microscope body 15 by one illumination system. Supply is possible.
- the microscope body 15 is composed of an inverted microscope, for example.
- the microscope main body 15 includes a stage 31 on which a sample to be observed is placed.
- the microscope body 15 is connected to a camera 34 that captures a fluorescent image of the sample placed on the stage 31.
- the camera 34 for example, a CCD camera having a plurality of pixels is used.
- the microscope main body 15 is supplied with an objective lens that irradiates the stage 31 with the excitation light L1 and the activation light L2, and fluorescence (observation light) emitted from a fluorescent substance in the sample.
- An imaging lens to be coupled to the light receiving surface is provided.
- the objective lens and the imaging lens are configured as an imaging optical system of the present invention for observing a sample placed on the stage 31.
- the stage 31 is configured to allow total reflection illumination that totally reflects the excitation light L1 and the activation light L2 at the interface between the cover glass attached to the sample and the sample.
- FIG. 2 is an explanatory diagram showing a case where the sample S is irradiated with the activation light L2 (or excitation light L1) by total reflection illumination. As shown in FIG. 2, according to the total reflection illumination, when the illumination light (excitation light L1, activation light L2) is totally reflected, the sample S is illuminated by the evanescent light EV that oozes out from the cover glass 31a to the sample side. Can do.
- the range where the evanescent light EV reaches is limited to the range of about 100 to 150 nm from the interface, only the fluorescent substance located near the surface of the cover glass 31a can emit light, and it is high by significantly reducing the fluorescence of the background. It can be realized with an S / N ratio.
- microscope main body 15 of the present embodiment is configured to be usable by switching between the total reflection illumination and the normal epi-illumination.
- control unit 14 is a computer that comprehensively controls the microscope apparatus 10, and is connected to a storage unit 16, a display unit 17, and a camera controller 19.
- the control unit 14 includes at least a control signal generation function that generates a control signal for controlling these devices, a fluorescence image acquisition unit 141 that acquires a fluorescence image via the camera controller 19, and a plurality of control signal generation functions.
- An image forming unit 142 that generates a sample image from the fluorescent image of the sample, and a sample image analysis unit 143 that analyzes based on the generated sample image.
- the sample image analysis unit 143 includes an area setting unit 143A and an analysis processing unit 143B.
- the region setting unit 143A sets a predetermined region for the bright spot based on the sample image generated by the image forming unit 142.
- the analysis processing unit 143B performs quantitative analysis processing based on the image information indicating the predetermined region set for each bright spot by the region setting unit 143A. For example, Ratio or FRAP may be included as quantitative analysis processing. Specific processing of the sample image analysis unit 143 will be described later.
- the storage unit 16 includes, for example, a semiconductor memory or a hard disk, and stores a program used in the control unit 14 and data (fluorescence image or the like) supplied from the control unit 14 in a state that can be read from the control unit 14.
- the storage unit 16 indicates position information indicating the position of the bright spot and the state of the bright spot in the identification information for identifying the bright spot for each of the bright spots.
- Information (numerical values and the like) is stored in association with each other, and information indicating an area associated with the bright spot is also stored.
- the display unit 17 is, for example, a monitor (display device) or a printer (printing device), and provides a function of displaying and printing video based on image data output from the control unit 14.
- a monitor is used as the display unit 17.
- the camera controller 19 drives and controls the camera 34 connected to the microscope body 15.
- the camera controller 19 operates the camera 34 based on the control signal input from the control unit 14, acquires an image of fluorescence emitted from the sample, and outputs the acquired fluorescence image to the control unit 14.
- the microscope apparatus 10 realizes various operations necessary for carrying out an image processing method to be described later by executing a combination of the functions provided in the control unit 14. Therefore, the microscope apparatus 10 generates a sample image by STORM imaging processing and image processing, that is, a fluorescent image including a plurality of bright spots by expressing the position of the fluorescent substance image included in the acquired fluorescent image as a bright spot.
- the microscope apparatus 10 performs image analysis on a sample image obtained by imaging using a super-resolution microscope technique.
- FIG. 3 is a flowchart showing the image processing method of the present embodiment.
- the image processing method according to the present embodiment will be described in the description of the image observation method in the microscope apparatus 10.
- the image processing method includes an initialization processing step S101, a sample image generation step S102, and a sample image analysis step S103.
- the initialization process step S101 includes a step S11 for performing an initialization process required for the subsequent observation process in the microscope apparatus 10.
- the sample image generation step S102 includes a step S12 of irradiating the observation light with the activation light L2, and a step S13 of acquiring the second fluorescence image by irradiating the observation light after the irradiation with the activation light L2 with the excitation light L1.
- step S14 for storing the second fluorescence image, step S15 for determining the end of imaging, and step S16 for generating a sample image from the plurality of second fluorescence images.
- sample image analysis step S103 performs processing based on the STORM image (sample image), and based on the position information calculated as the position of the bright spot in the STORM image, a predetermined region including the position of the bright spot Is set as a region corresponding to the bright spot.
- the outline of the image observation procedure by the microscope apparatus 10 is as follows. First, in the initialization processing step S101, after the initialization processing is completed, in the sample image generation step S102, an operation of irradiating the sample with the activation light L2 and the excitation light L1 are obtained to obtain a second fluorescent image. The operation is repeated hundreds to tens of thousands of times (STORM imaging process). Then, a high-resolution STORM image is obtained by synthesizing a large number of captured second fluorescent images (STORM image processing).
- FIG. 4 is a diagram comparing an image (conventional image) observed without using the super-resolution microscope technique and the STORM image acquired in the sample image generation step S102
- FIG. 4 (a) is a conventional image
- FIG. 4B is a diagram showing an example of the STORM image
- FIG. 5 is a schematic diagram conceptually showing a conventional image
- FIG. 6 is a schematic diagram conceptually showing a STORM image.
- the conventional image cannot be imaged from the optical resolution limit to the details.
- FIG. 4A the conventional image cannot be imaged from the optical resolution limit to the details.
- the detection target indicated by the conventional image is shown as a continuous line.
- the STORM image acquired by the STORM image processing is an image showing a result detected with a higher resolution than the conventional image.
- discretely arranged bright spots are shown.
- the sample image analysis step S103 performs a process of analyzing based on the STORM image (sample image). For example, the area setting unit sets a predetermined area including the position of the bright spot as an area corresponding to the bright spot based on the position information calculated as the position of the bright spot in the STORM image (step S17).
- the bright spot P1 and the bright spot P2 shown in FIG. 6 are shown. If a person observes this sample image, it can be seen that the bright spot P1 and the bright spot P2 are adjacent to each other in the sample image. However, the position information (coordinate position) indicating each of the bright spot P1 and the bright spot P2 can be understood as being arranged at a predetermined distance.
- the bright spot P1 and the bright spot P2 shown in the sample image are not limited to those detected as points on the same fluorescent image, but those derived from data detected at different timings are arranged on the sample image.
- the predetermined areas C1 and C2 corresponding to the bright spots P1 and P2 are associated with the bright spots P1 and P2, respectively. . Although not shown, this region association is performed for all the bright spots in the sample image.
- a specific bright spot is determined as a reference point.
- “Near the bright spot” indicates a range included in a predetermined condition based on the position of the bright spot.
- a range of “near a bright spot” is defined based on a position in space.
- a predetermined area defined by the distance from the bright spot can be specified as a range.
- the predetermined region is defined as a sphere, the diameter is set in a range from ⁇ 10 nm to 200 nm, for example.
- the predetermined area can be defined as a space window that is included in a range from a position of a bright spot as a reference to a predetermined distance.
- the vicinity of a bright spot is defined by a time interval from the time when the bright spot is detected.
- the time point when the bright spot is detected is the starting point (origin) of the time axis
- the time lag from the time point when the bright spot is detected can be specified by the elapsed time from the start point.
- an elapsed time range that defines “the vicinity of a bright spot” can be defined as a period. For example, it is desirable to set the period from the period from the detection of the bright spot to 1 ms (milliseconds) to the same 10 seconds as the range.
- the time window in which the range from the detection of a certain bright spot to the lapse of the above period is an effective detection range is set in the period.
- a plurality of fluorescent images are detected by STORM, and at least one sample image is generated based on the fluorescent images included in this period.
- a value indicating the state of the defined spatial region By specifying a value indicating the state of the defined spatial region, even a result detected under different conditions can be quantitatively compared. For example, to illustrate the different conditions described above, when the spectral band is detected in a different range in a predetermined region on the same space and in a predetermined period on the same time axis, or detected in another predetermined region in the space And the case where it is detected in another period on the time axis.
- a specific evaluation value can be calculated, for example, by taking a difference between integral values detected based on different conditions or taking a ratio by the above quantitative comparison method.
- this evaluation value is within a predetermined range determined spatially or temporally, even if it is an integral value detected under different conditions (position, time, wavelength, etc.), it is calculated from the sample image detected last time. When there is little difference from the information, it can be estimated that the same sample has been detected.
- an analysis process based on the determined image information is performed by determining a predetermined area based on the bright spot of the sample image as described above.
- FIG. 7 is a diagram showing bright spots in the STORM image.
- the target range shown in FIG. 7 is described as indicating a three-dimensional space, but is not limited to processing on a two-dimensional plane.
- FIG. 7 (a) and FIG. 7 (b) shown here show sample images detected under different conditions of the spectrum band of light in the same period in a predetermined region in the same space.
- the wavelength band of the light of the sample image SPa shown in FIG. 7A is set to a region of 530 nm (nanometers) or longer, in other words, a region having a wavelength longer than that of green light, and the light of the sample image SPb shown in FIG.
- the wavelength band is less than 530 nm, in other words, a region having a wavelength shorter than that of green light.
- 530 nm is defined as a threshold
- the wavelength band of the light of the sample image SPa shown in each figure (a) is set to an area of 530 nm (nanometers) or more, and each figure (b) is shown.
- the band of the light wavelength of the sample image SPb is set to less than 530 nm.
- the positions (coordinates) of symbols OR1 to OR10 in FIG. 7A indicate the positions (coordinates) of individual bright spots.
- Reference numerals CR1 to CR10 indicate predetermined areas on the space with reference to the individual bright spots OR1 to OR10. In FIG. 7, the predetermined area is a sphere (circle). Further, the positions of the symbols OG1 to OG11 in FIG.
- FIG. 7A is compared with FIG. 7B, it can be seen that the number and position of the detected bright spots are different. Further, in FIG. 7 (a) and FIG. 7 (b), the distance between the bright spots detected under the conditions other than the wavelength is different due to the difference in the positions of the bright spots. Recognize.
- the sample image analysis unit 143 (FIG. 1) includes the position of the bright spot according to the position of the bright spot in each sample image.
- the predetermined area is set as an area corresponding to the bright spot.
- bright spot position information (coordinate position) and information indicating the bright spot state are associated with each other and stored in the storage unit 16.
- the sample image analysis unit 143 sets a value based on the information indicating the state of the bright spot as a value indicating the state of the predetermined region.
- the sample image analysis unit 143 treats an area included in a predetermined radius centered on the position indicated by the position information as a predetermined area.
- the predetermined region is associated with a plurality of unit lattices smaller than the predetermined region so that the analysis can be performed with a resolution corresponding to the size of the unit lattice.
- the sample image analysis unit 143 may apply an analysis technique such as Ratio or FARP as the analysis with the resolution corresponding to the size of the unit cell.
- FIG. 8 is a diagram showing a method for setting an area corresponding to a bright spot in the STORM image in the present embodiment.
- the sample image is analyzed according to the rules defined as the setting method 1 shown below.
- Setting method 1 Filling a predetermined area with a predetermined value (filling the sphere uniformly with a value indicating the state of one bright spot in the sphere)
- Rule 1 First, a value indicating the state of one bright spot associated with each predetermined region (sphere) is set to a predetermined constant.
- the intensity (number of photons) of a fluorescent image emitted from a sample (molecule) and forming a bright spot may be used as a value indicating the state of the bright spot.
- Rule 2 A value indicating the state of one bright spot associated with each predetermined area (sphere) is assigned to each area in a certain sphere indicated as the predetermined area.
- Rule 3 Next, when there are regions that overlap each other in a plurality of predetermined regions (spheres), each of the overlapping predetermined regions (spheres) is assigned in the above rule 2 respectively.
- a region Z1a indicated by left-down hatching indicates a region where two or more spheres overlap each other.
- a region Z1b indicated by right-down hatching indicates a region where two or more spheres overlap a predetermined region (sphere). Comparing the region Z1a in FIG. 8 (a) with the region Z1b in FIG. 8 (b) reveals that the positions of the respective regions are different, making it easier to perform quantitative analysis.
- the size of each predetermined region and the number of photons of the bright spot are uniform, the size of the region where the predetermined region (sphere) overlaps appears depending on the distance between the bright points. That is, the value assigned to each region changes according to the density at which bright spots exist.
- the space can be processed as a predetermined area (sphere) having a desired size.
- Information of desired resolution can be obtained by finely dividing the space.
- the number of data increases according to the number of divisions, it is suitable when the analysis target area is relatively narrow. For example, when analyzing a sample image in which the presence of two types of molecules changes from moment to moment in real time, it is preferable to perform grouping within a range having a diameter of 50 nm.
- FIG. 9 is a diagram showing a method for setting an area corresponding to a bright spot in the STORM image in the present embodiment.
- the sample image is analyzed according to the rules defined as the setting method 2 shown below.
- Setting method 2 When filling a predetermined area (sphere) with a predetermined value (filling the sphere uniformly with the number of bright spots contained in the sphere)
- a predetermined value corresponding to the number of bright spots included in each predetermined area is assigned.
- Rule 1 First, a value indicating the state of a bright spot included in a predetermined area (sphere) is calculated.
- a numerical value corresponding to the number of bright spots included in the predetermined area (sphere) may be a value indicating the state of the bright spots included in the predetermined area (sphere).
- Rule 2 The value calculated in rule 1 is assigned to each area in a certain sphere shown as the predetermined area.
- Rule 3 Next, when there are regions that overlap each other in a plurality of predetermined regions (spheres), each of the overlapping predetermined regions (spheres) is assigned in the above rule 2 respectively. The sum of the numerical values is calculated, and the sum of the calculation results is newly assigned as the value of the area where the predetermined area (sphere) overlaps.
- regions (Z21a to Z24a) shown by changing the three types of shading indicate regions having different values assigned to predetermined regions (spheres).
- areas (Z21b to Z23b) indicated by three types of hatching indicate areas having different values assigned to the predetermined area (sphere). Comparing FIG. 9 (a) and FIG. 9 (b) reveals that the positions of the regions indicated by the respective shades are different, and it is easy to perform quantitative analysis.
- the size of each predetermined area can be made uniform, and the density of bright spots in the predetermined area (sphere) can be expressed by the number of bright spots included in the predetermined area. For example, even when the blinking time of the bright spot varies, the influence of the variation in the blinking time can be reduced, and the quantitative analysis can be performed by eliminating the variation in the blinking time.
- FIG. 10 is a diagram showing a method for setting a region corresponding to a bright spot in the STORM image in the present embodiment.
- the sample image is analyzed according to a rule defined as the setting method 3 shown below.
- Setting method 3 dividing the cube as a predetermined area and filling it with a predetermined value (filling the cube uniformly with a value indicating the state of the bright spot contained in the cube)
- Rule 1 First, a cube having a predetermined size is arranged to divide the region. Note that the positions where the cubes are arranged may be determined along the orthogonal coordinates, and may be arranged at positions determined by the lattice. An area shown as a divided cube is defined as a predetermined area as an analysis unit.
- a predetermined region shown as a unit grid becomes a cube.
- the size of the unit cell is a cube having a side length of 50 nm.
- the predetermined region does not need to be an equidistant lattice, and may be set to an arbitrary shape (random shape). Also, a value indicating the state of the predetermined area is set to a predetermined constant.
- a numerical value proportional to the number of photons of (a plurality of or one) bright spots included in a predetermined area or a numerical value proportional to the number of the (multiple or one) bright spots included in a predetermined area, It is good also as a value to show.
- Rule 2 A value indicating the state of a predetermined area (cube) is assigned to each predetermined area indicated as the predetermined area. In FIG. 10, the results up to rule 2 are shown as oblique projections. In FIG. 10A, cubes denoted by reference numerals QR1 to QR10 are arranged in a partial region of the lattice.
- the positions of the cubes QR1 to QR10 are determined according to the position of the bright spot in a specific wavelength range.
- the specific wavelength range in FIG. 10A is, for example, a wavelength range of 530 nm or more.
- a predetermined numerical value is assigned to the cubes QR1 to QR10 according to each bright spot as a value indicating the state of the predetermined region.
- the numerical values assigned to the cubes QR1 to QR10 are sequentially set as (2, 2, 3, 3, 3, 3, 2, 1, 1, 1).
- FIG. 10B cubes indicated by reference numerals QG1 to QG11 are arranged in a partial region of the lattice.
- the positions of the cubes QG1 to QG11 are determined according to the position of the bright spot in the specific wavelength range.
- the specific wavelength range in FIG. 10B is, for example, a wavelength range of less than 530 nm.
- predetermined numerical values are assigned to the cubes QG1 to QG11 as values indicating the state of the predetermined region in accordance with each bright spot.
- the numerical values assigned to the cubes QG1 to QG11 are sequentially set as (2, 3, 3, 3, 3, 3, 2, 4, 3, 3, 1).
- FIG. 10 (a) is compared with FIG. 10 (b)
- the position of the region indicated by each cube is determined according to the wavelength of the bright spot existing in the unit cell.
- the size of each predetermined area is equal to the size of a cube which is a unit cell. In this way, a value corresponding to the number of photons of (a plurality or one) of bright spots belonging to this area or a value proportional to the number of (a plurality of or one) of bright spots included in a predetermined area is obtained. Can be set.
- the space can be processed as a predetermined area (cube) having a desired size.
- Information of desired resolution can be obtained by finely dividing the space.
- the number of data increases according to the number of divisions, it is suitable when the analysis target area is relatively narrow.
- data that is easy to compare can be generated by matching the pitch of the pixels of the confocal image with the pitch of arranging the cube. Note that the information generated by this embodiment replaces the original signal shape (sphere) with a cube.
- FIG. 11 is a diagram showing a method for setting a region corresponding to a bright spot in the STORM image in the present embodiment.
- the sample image is analyzed according to a rule defined as the setting method 4 shown below.
- Setting method 4 When a determination area (sphere) and a predetermined area (cube) are defined, and a value of the predetermined area (cube) is determined based on a result determined by the determination area (sphere))
- a predetermined value is assigned to each predetermined area.
- Rule 1 First, an area is divided into analysis target ranges based on a grid with predetermined intervals.
- An area indicated as a divided unit cell is defined as a predetermined area as an analysis unit.
- a predetermined region shown as a unit grid becomes a cube. For example, in order to analyze in real time a sample image (three-dimensional image) in which the presence of two types of molecules changes from moment to moment, the size of the unit cell is a cube having a side length of 50 nm.
- Rule 2 Next, a determination area (sphere) corresponding to each bright spot is defined.
- the radius of the determination area is determined so that the determination area is an area having a size larger than the unit lattice (cube).
- the size of the determination region is, for example, a sphere having a diameter of 200 nm (radius of 100 nm).
- the size of the unit cell and the size of the determination region can be set independently, so that the size of the unit cell and the size of the determination region can be easily set. For example, by defining a sphere having a radius according to the number of photons as the determination region, even if the size of the sphere becomes larger than the size of the unit cell, the following determination can be made without adjusting the size of the determination region.
- each determination area is assigned a value based on information indicating the state of the bright spot located at the center of each determination area (sphere). For example, information indicating the state of the bright spot is associated with a value proportional to the number of photons at the bright spot.
- Rule 4 Next, a value corresponding to the determination region (sphere) included in each unit lattice (cube) is set as a value indicating the state of the bright spot included in the unit case.
- the space can be processed as a unit lattice (cube) having a desired size.
- Information of desired resolution can be obtained by finely dividing the space.
- the position in the space can be normalized by using the unit cell (cube), so that the analysis becomes easy.
- the determination area (sphere) and the predetermined area (cube) are set. However, only a predetermined area having an arbitrary three-dimensional shape is set, and the number of bright spots included in each predetermined area is set.
- the numerical value may be a value indicating the state of the bright spot included in the predetermined area.
- FIG. 12 is a diagram showing a method for setting a region corresponding to a bright spot in the STORM image in the present embodiment.
- the sample image is analyzed according to a rule defined as the setting method 5 shown below.
- Setting method 5 about the case where the size of the predetermined area is determined according to the brightness of the bright spot, and is filled with a predetermined value according to the information indicating the state of the bright spot (the sphere is filled uniformly)
- a predetermined value is assigned to each predetermined area.
- FIG. 12 (a) unlike the spheres CR1 to CR10 having the same radius shown in FIG. 7 (a), the spheres CR1 having radii different from each other with reference to the positions of the bright spots OR1 to OR10. 'From CR10' is shown.
- FIG. 12 (a) unlike the spheres CR1 to CR10 having the same radius shown in FIG. 7 (a), the spheres CR1 having radii different from each other with reference to the positions of the bright spots OR1 to OR10. 'From CR10' is shown.
- FIG. 12 (a) unlike the spheres CR1 to CR10
- Each sphere is generated according to the following rules.
- Rule 1 First, a sphere having a radius to a second bright spot (the closest bright spot) adjacent to the first bright spot is detected. The detected sphere is defined as a predetermined area corresponding to the first bright spot. A value indicating the state of the bright spot is determined in advance for one bright spot associated with each predetermined region (sphere).
- a numerical value proportional to the number of photons at the bright spot may be a value indicating the state of the bright spot.
- Rule 2 A value calculated based on the value of the state of each bright spot and the volume of the fixed area (sphere) is assigned to each area in the sphere indicated as the predetermined area. For example, the result of dividing the value based on the information indicating the state of the first bright spot by the value indicating the size (volume) occupying the first area indicates the state of the bright spot included in the first area. Value.
- the sum of the numerical values assigned in rule 2 for each of the overlapping predetermined areas (spheres) And a sum based on the calculation result may be newly assigned as the value of the area where the predetermined area (sphere) overlaps.
- the size of each predetermined region is determined according to the density at which the bright spots exist, and the number of photons at the bright spots can be distributed according to the density. That is, the value assigned to each region can be changed according to the density at which bright spots exist.
- the resolution can be increased when the density at which bright spots are present is high, and the resolution can be decreased when the density at which bright spots are present is low.
- the calculation processing amount can be adjusted according to the density at which the bright spots exist, and analysis can be performed efficiently. It becomes like this.
- the microscope apparatus 10 (analysis apparatus) can perform quantitative analysis based on a high-resolution image.
- the present invention is not limited to the configuration shown in the above embodiment, and the configuration can be changed without changing the gist of the invention.
- STORM is taken as an example of a fluorescence microscope apparatus that acquires a super-resolution image, and a case where quantitative analysis is performed from an image acquired by these methods is exemplified.
- US Pat. No. 7,626, The present invention is also applicable to a case where quantitative analysis is performed from an image (sample image) captured by PALM (Photoactivation Localization Microscopy) disclosed in No. 695 or the like.
- Dronpa is adopted as a fluorescent material.
- Dronpa When Dronpa is irradiated with light of a predetermined intensity, it can absorb the excitation wavelength, and has a characteristic that does not emit fluorescence even when receiving excitation light in a non-activated state. Therefore, the low-resolution fluorescent image can be used as a mask image by acquiring the low-resolution fluorescent image and the high-resolution fluorescent image by adjusting the intensity of light applied to the sample as appropriate, as in the above-described STORM. The quantitative analysis can be performed from the high-resolution fluorescence image.
- STED Stimulated emission
- the present invention can also be applied to a case where quantitative analysis is performed from an image (sample image) captured by depletion. Even in this case, as the conventional image, the image according to the above-described embodiment or the image acquired by the above-described SIM can be used. Note that the requirements of the above-described embodiments can be combined as appropriate. Some components may not be used. In addition, as long as it is permitted by law, the disclosure of all publications and US patents relating to the devices cited in the above embodiments and modifications are incorporated herein by reference.
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Abstract
Description
本願は、2013年9月27日に出願された日本国特願2013-200705号に基づき優先権を主張し、その内容をここに援用する。
このようなSTORMにおいて、蛍光輝点の位置を求める手法として、得られた情報に基づいた分布の確率を算出する演算処理(Gaussian分布)の結果から擬似的に蛍光輝点の位置を算出する手法が知られている(例えば、非特許文献1参照)。
本発明に係る態様は、高分解能の画像を基にした定量解析を行える解析装置、顕微鏡装置、解析方法、及びプログラムを提供することを目的とする。
例えば、継続的に観察された蛍光画像から、細胞の状態を定量的に解析する解析手法がある。従来の解析手法においては受光素子の画素(ピクセル)を空間の最小単位として取得した蛍光画像を扱うので、蛍光画像の強度分布情報(観察試料に含まれる蛍光物質から発生する蛍光の強度分布等)を「画素」という最小空間単位に割振り、定量的に画素(又は画素間)で強度値(蛍光光量)を利用した四則演算、つまり画像(又は画像間)の画素強度値(蛍光光量)を利用した四則演算を行うことができた。このようにして得た情報を基にして、定量的に解析する方法として、例えば、Ratio(「P-B比(P-B ratio(peak to background ratio))」ともいう。)やFRAP(光褪色後蛍光回復法、fluorescence recovery after photo bleaching)やFRET(fluorescence resonance energy transfer)などの方法がある。上記の方法に関する詳細は、下記の文献を参照とする。
(1)Rajesh Babu Sekar and Ammasi Periasamy,”Fluorescence resonance energy transfer (FRET) microscopy imaging of live cell protein localizations”, The Journal of Cell Biology,Volume 160, Number 5, March 3,2003:629-633
(2)Richard N. Day and Fred Schaufele, ”Imaging Molecular Interactions in Living Cells”, Endocrine Society, Molecular Endocrinology, July 2005, 19(7):1675-1686
(3)Peter F. Davies, Jenny Zilberberg, Brian P. Helmke, ”Spatial Microstimuli in Endothelial Mechanosignaling”, American Heart Association, Journal of the American Heart Association, Circuiation Research 2003;92:359-370
ただし、観察試料に含まれる蛍光物質の位置情報に基づいて作成したSTORM画像は、輝点の情報(光子数、楕円率など)が位置情報(重心座標)に帰属しているので、強度値(蛍光光量)を画素単位で取得する蛍光画像に対して適用する従来の定量解析方法をそのまま適用することができなかった。
そこで、以下の実施形態に示す手法により、高分解能の試料画像において、複数の輝点を含む蛍光画像の状態を定量化し、定量的な解析を行えるようにする解析方法について説明する。
一般的なSTORMは、高分解能の試料画像を得ることができるものであるが、時間軸上で離散的に検出された複数の蛍光画像における蛍光輝点を基にして試料画像を生成しており、1枚の試料画像を得るには所定の期間に検出された複数の蛍光画像を必要とする。
STORMは、蛍光画像における輝度分布から蛍光輝点の位置を計算によって算出する。
要するに、STORMは、蛍光輝点の位置を光学的に得た情報を基に位置を算出して蛍光輝点の位置を示す分解能を高めている。
そのため、一般的なSTORMは、1つの試料画像を得るために、異なる時刻に検出された複数の蛍光画像から蛍光輝点の位置を算出する。蛍光輝点の位置を算出にあたり、蛍光画像の数を多くすることにより、得られる試料画像の分解能を高めることが知られている。ただし、輝度分布を基にして確率的に蛍光輝点の位置を算出するタイプのSTORMでは、分解能を高めるために蛍光画像の数を多くすると、1つの試料画像を得るための時間が長くなるとともに、演算負荷が増加してしまう。逆に、試料画像を得る間隔を短くしようとして、蛍光画像の数を少なくすると、必要な分解能が得られなくなってしまう。
以下に示す高分解能の試料画像の解析方法は、試料に照射した励起光による輝点を含む蛍光像を複数取得して、蛍光像を示す画像情報から算出された輝点の位置を示す試料画像を基に解析する。また、同解析方法は、試料画像における輝点の位置として算出された位置情報に基づいて、該輝点の位置を含む所定領域を、該輝点に対応する領域として設定している。
顕微鏡装置10は、光源12と、制御部14と、顕微鏡本体15と、記憶部16と、表示部17とを備えている。
励起照明系11は、レーザ光源21と、シャッタ22と、全反射ミラー32とを備えており、全反射ミラー32を介して励起照明系11と顕微鏡本体15とが接続されている。
あるいはシャッタ22として、AOTF(Acousto-Optic Tunable Filter;音響光学フィルタ)を用いても良い。全反射ミラー32は、レーザ光源21から照射される励起光L1を後述する顕微鏡本体15のステージ31に向けて全反射させるためのものである。
このような構成に基づき、励起照明系11は、ステージ31上の観察視野(観察領域)の全域に対して励起光L1を照射するようになっている。
このような構成に基づき、活性化照明系13は、ステージ31上の観察視野(観察領域)に対して、活性化光L2をスキャナ43により走査しながら照射可能になっている。
図2は、全反射照明により活性化光L2(あるいは励起光L1)を試料Sに照射する場合を示す説明図である。図2に示すように、全反射照明によれば、照明光(励起光L1、活性化光L2)が全反射する際にカバーガラス31aから試料側へにじみ出るエバネッセント光EVにより試料Sを照明することができる。エバネッセント光EVが届く範囲は界面から100~150nm程度の範囲に限られるため、カバーガラス31a表面近傍に位置する蛍光物質のみを発光させることができ、バックグランウドの蛍光を著しく低減することで高いS/N比で実現することができる。
また、試料画像解析部143は、領域設定部143Aと解析処理部143Bと、を有する。領域設定部143Aは、画像形成部142によって生成された試料画像を基に、輝点に対して、所定領域を設定する。解析処理部143Bは、領域設定部143Aによって、輝点ごとに設定された所定領域を示す画像情報に基づいて、定量解析処理を行う。例えば、定量解析処理として、Ratioや、FRAPを含めても良い。試料画像解析部143の具体的な処理については後述とする。
カメラコントローラ19は、顕微鏡本体15に接続されたカメラ34を駆動制御する。
カメラコントローラ19は、制御部14から入力される制御信号に基づいてカメラ34を動作させ、試料から放射された蛍光の画像を取得し、取得した蛍光画像を制御部14に出力する。
まず、初期化処理ステップS101において、初期化処理を終えた後、試料画像生成ステップS102において、活性化光L2を試料に照射する動作と、励起光L1を照射して第2の蛍光画像を得る動作とを、数百回から数万回繰り返す(STORM撮影処理)。そして、撮影した多数の第2の蛍光画像を合成することで、高解像度のSTORM画像を得る(STORM画像処理)。
図4は、超解像顕微鏡技術を用いずに観察される画像(コンベンショナル画像)と、試料画像生成ステップS102で取得されるSTORM画像とを比較した図であり、図4(a)はコンベンショナル画像の一例を示し、図4(b)はSTORM画像の一例を示す図である。また、図5は、コンベンショナル画像を概念的に示す模式図であり、図6は、STORM画像を概念的に示す模式図である。
図4(a)に示されるように、コンベンショナル画像は光学的な解像限界から細部まで画像化することができない。図5に示すように、コンベンショナル画像によって示される検出対象は、連続した線として示されている。
一方、図4(b)に示されるように、STORM画像処理で取得されるSTORM画像は、コンベンショナル画像に比べて高分解能で検出された結果を示す画像である。図6に示されるように、離散的に配置された輝点が示されている。
前述の図6を参照し、本実施形態におけるSTORM画像(試料画像)から解析を行うための原理について説明する。
図6に示されている輝点P1と輝点P2が示されている。この試料画像を、人が観察すれば、輝点P1と輝点P2は、試料画像において互いに隣接する関係にあることがわかる。
しかしながら、輝点P1と輝点P2をそれぞれ示す位置情報(座標位置)からは、所定の距離を隔てて配置していることがわかるに留まる。この試料画像に示される輝点P1と輝点P2は、同じ蛍光画像上の点として検出されるものに限られず、別々のタイミングで検出されたデータから導出されたものが、試料画像上に並んだ点として示されている場合がある。
仮にこの点が、それぞれ移動した場合、先に検出されていた点が移動したものなのか、別の点が移動してきたものか、さらに、新たに検出された点であるかを、データ上から判定することが困難である。
そこで、STORMによって生成された試料画像における個々の輝点ごとに順に以下の処理を行うことにより、輝点P1,P2に対して、輝点P1、P2に対応する所定領域C1、C2をそれぞれ関連付ける。図示していないが、この領域の関連付けは、試料画像における全ての輝点に対し行う。
「輝点の近傍」は、輝点の位置を基準とする所定の条件に含まれる範囲を示す。例えば、「輝点の近傍」の範囲を空間における位置に基づいて定義する。この場合、輝点からの距離によって定められる所定領域を範囲として特定することができる。所定領域を、球として定義した場合、その直径を例えばφ10nmから200nmまでの範囲に設定する。
要するに、上記所定領域について、基準とする輝点の位置から、予め定められた所定の距離までに含まれる範囲とする空間窓として定義できる。
この期間内には、STORMによる複数の蛍光画像が検出されており、この期間内に含まれる蛍光画像に基づいて、少なくとも1つの試料画像が生成される。
図7は、STORM画像における輝点を示す図である。この図7に示されている対象範囲は、3次元空間を示すものとして説明するが、2次元平面上の処理とすることを制限するものではない。
図7(a)における符号OR1からOR10の位置(座標)は個々の輝点の位置(座標)を示す。符号CR1からCR10は個々の輝点OR1からOR10を基準とする空間上の所定領域を示し、この図7においては所定領域を球(円)とした場合を示している。また、図7(b)における符号OG1からOG11の位置は個々の輝点の位置を示し、符号CG1からCG11は個々の輝点OG1からOG11を基準とする空間上の所定領域を示し、この図7においては所定領域を球(円)とした場合を示している。
試料画像解析部143は、位置情報が示す位置を中心とする所定の半径に含まれる領域を所定領域として扱う。例えば、以下の実施形態に示すように、上記の所定領域を、所定領域の大きさより小さい複数の単位格子に対応付けることにより、単位格子の大きさに応じた分解能により解析を行うことができるようになる。試料画像解析部143は、単位格子の大きさに応じた分解能による解析としては、Ratioや、FARPなどの解析手法を適用してもよい。
図8を参照し本実施形態におけるSTORM画像における輝点の位置に基づいて、輝点に対応する領域を設定する一態様について説明する。
図8は、本実施形態におけるSTORM画像における輝点に対応する領域の設定方法を示す図である。
(設定方法1:所定領域を所定の値で埋める(球内を球内の一つの輝点の状態を示す値で均一に埋める)場合について)
本実施形態において、それぞれの所定領域内に所定の値を割り付ける場合について説明する。
ルール1:まず、所定領域(球)ごとに対応付けられている一つの輝点の状態を示す値を、予め定められる所定の定数に設定する。例えば、試料(分子)から発せられ、輝点を形成する蛍光像の強度(光子数)、つまり輝点の光子数に比例する数値を、輝点の状態を示す値としてもよい。
ルール2:所定領域(球)ごとに対応付けられている一つの輝点の状態を示す値を、所定領域として示される一定の球内の領域に、それぞれ割り付ける。
ルール3:次に、複数の所定領域(球)に係り、それらの所定領域(球)において互いに重なる領域がある場合、重なる所定領域(球)のそれぞれに対して上記ルール2においてそれぞれ割り付けられている数値の和を計算し、所定領域(球)の重なる領域の値として計算結果による和を新たに割り付ける。
図8(a)において左下がりのハッチングで示す領域Z1aは、2つ以上の球の所定領域(球)が重なる領域を示す。図8(b)において右下がりのハッチングで示す領域Z1bは、2つ以上の球が所定領域(球)の重なる領域を示す。図8(a)の領域Z1aと図8(b)の領域Z1bとを比べると、それぞれの領域の位置が相違していることが明らかになり、定量解析が行いやすくなっていることがわかる。
上記ルールに従えば、各所定領域の大きさと、輝点の光子数が一律であれば、輝点間の距離によって、所定領域(球)が重なる領域の大きさが異なって現れる。即ち、輝点が存在する密度に応じて、各領域に割り付けられる値が変化する。
例えば、2種類の分子の存在が時々刻々と変わる試料画像をリアルタイムで解析する際には、50nmを直径とする範囲でグルーピングすると好適である。
図9を参照し本実施形態におけるSTORM画像における輝点の位置に基づいて、輝点に対応する領域を設定する一態様について説明する。
図9は、本実施形態におけるSTORM画像における輝点に対応する領域の設定方法を示す図である。
(設定方法2:所定領域(球)を所定の値で埋める(球内を球の中に含まれる輝点の数で均一に埋める)場合について)
本実施形態において、それぞれの所定領域内に、含まれる輝点の数に応じた所定の値を割り付ける場合について説明する。
ルール1:まず、所定領域(球)に含まれる輝点の状態を示す値を算出する。
例えば、所定領域(球)に含まれる輝点の数に応じた数値を、所定領域(球)に含まれる輝点の状態を示す値としてもよい。
ルール2:所定領域として示される一定の球内の領域に、ルール1において算出した値をそれぞれ割り付ける。
ルール3:次に、複数の所定領域(球)に係り、それらの所定領域(球)において互いに重なる領域がある場合、重なる所定領域(球)のそれぞれに対して上記ルール2においてそれぞれ割り付けられている数値の和を計算し、所定領域(球)の重なる領域の値として計算結果による和を新たに割り付ける。
図10を参照し本実施形態におけるSTORM画像における輝点の位置に基づいて、輝点に対応する領域を設定する一態様について説明する。
図10は、本実施形態におけるSTORM画像における輝点に対応する領域の設定方法を示す図である。
(設定方法3:所定領域として立方体で分割して所定の値で埋める(立方体内を立方体の中に含まれる輝点の状態を示す値で均一に埋める)場合について)
本実施形態において、それぞれの所定領域内に所定の値を割り付ける場合について説明する。
ルール1:まず、所定の大きさの立方体を配置して領域を分割する。
なお、立方体を配置する位置を、直交する座標に沿って格子を定め、格子によって定められる位置に配置しても良い。分割された立方体として示される領域を、解析単位とする所定領域として定義する。なお、直交する座標に沿って格子を定め、格子の間隔を等しくすることにより、単位格子として示される所定領域が、立方体になる。例えば、2種類の分子の存在が時々刻々と変わる試料画像(3次元画像)をリアルタイムで解析するために、上記の単位格子の大きさを、一辺の長さが50nmの立方体とする。
なお、所定領域として、等間隔の格子である必要はなく、任意の形状(ランダム形状)に設定してもよい。
また、所定領域の状態を示す値を、予め定められる所定の定数に設定する。例えば、所定領域に含まれる(複数又は1つの)輝点の光子数に比例する数値、あるいは所定領域に含まれる(複数又は1つの)輝点の数に比例する数値を、所定領域の状態を示す値としてもよい。
ルール2:所定領域(立方体)の状態を示す値を、所定領域として示される一定の領域に、それぞれ割り付ける。
なお、この図10においては、上記ルール2までの結果を斜投影図として示す。
図10(a)において、格子の一部の領域に、符号QR1からQR10として示す立方体が配置されている。立方体QR1からQR10のそれぞれの位置は、特定の波長範囲の輝点の位置に応じて定められている。図10(a)における特定の波長範囲は、例えば、530nm以上の波長範囲とする。ここで、上記のルールに従って、所定領域の状態を示す値として、各輝点に応じて立方体QR1からQR10に所定の数値を割り付ける。例えば、立方体QR1からQR10ごとに割り付けた数値を、順に(2、2、3、3、3、3、2、1、1、1)と設定する。
図10(b)において、格子の一部の領域に、符号QG1からQG11として示す立方体が配置されている。立方体QG1からQG11のそれぞれの位置は、特定の波長範囲の輝点の位置に応じて定められている。図10(b)における特定の波長範囲は、例えば、530nm未満の波長範囲とする。ここで、上記のルールに従って、所定領域の状態を示す値として、各輝点に応じて立方体QG1からQG11に所定の数値を割り付ける。例えば、立方体QG1からQG11ごとに割り付けた数値を、順に(2、3、3、3、3、3、2、4、3、3、1)と設定する。
上記のように、図10(a)と図10(b)とを比べると、単位格子内に存在する輝点の波長に応じて、それぞれの立方体で示した領域の位置が定められていることから、輝点の波長に応じて立方体の位置が相違していることが明らかになり、定量解析が行いやすくなっていることがわかる。
上記ルールに従えば、各所定領域の大きさが単位格子である立方体の大きさに揃っている。このようにして、この領域内に帰属している(複数又は1つの)輝点の光子数に応じた値、あるいは所定領域に含まれる(複数又は1つの)輝点の数に比例する数値を設定することができる。
また、従来のコンフォーカル画像との比較において、コンフォーカル画像の画素のピッチと、上記立方体を配置するピッチとにおける互いのピッチを合わせることにより、比較しやすいデータを生成することができる。
本実施形態によって生成される情報は、本来の信号の形(球)を立方体に置き換えていることに注意する。
図11を参照し本実施形態におけるSTORM画像における輝点の位置に基づいて、輝点に対応する領域を設定する一態様について説明する。
図11は、本実施形態におけるSTORM画像における輝点に対応する領域の設定方法を示す図である。
(設定方法4:判定領域(球)と所定領域(立方体)とを定義して、判定領域(球)によって判定された結果に基づいた値で、所定領域(立方体)の値を定める場合について)
本実施形態において、それぞれの所定領域内に所定の値を割り付ける場合について説明する。
なお、直交する座標に沿って格子を定め、格子の間隔を等しくすることにより、単位格子として示される所定領域が、立方体になる。例えば、2種類の分子の存在が時々刻々と変わる試料画像(3次元画像)をリアルタイムで解析するために、上記の単位格子の大きさを、一辺の長さが50nmの立方体とする。
ルール2:次に、各輝点に対応する判定領域(球)を規定する。その判定領域が単位格子(立方体)より大きな大きさを有する領域となるように、判定領域の半径が定められる。
上記の単位格子(一辺の長さが50nmの立方体)の大きさに従えば、判定領域の大きさを例えば直径200nm(半径100nm)の球とする。このように単位格子の大きさと判定領域の大きさとをそれぞれ独立に定めるようにしたことにより、単位格子の大きさと判定領域の大きさを容易に設定することが可能になる。例えば、光子数に応じた半径の球を判定領域として定めることにより、その球の大きさが単位格子の大きさより大きくなるような場合が生じても改めて判定領域の大きさを調整することなく以下の解析処理を進めることが可能になる。
ルール3:次に、各判定領域(各球)に、それぞれの判定領域(球)の中心に位置する輝点の状態を示す情報に基づいた値を、それぞれ割り付ける。例えば、輝点の状態を示す情報には、輝点の光子数に比例した値が対応付けられる。
ルール4:次に、各単位格子(立方体)内に含まれる判定領域(球)に応じた値を、単位格に含まれる輝点の状態を示す値として設定する。例えば、単位格子(立方体)内に含まれる判定領域(球)に応じた値として、判定領域(球)の体積に対する、単位格子(立方体)内に含まれる判定領域(球)の体積の比率に応じた光子数を立方体に一定値として設定する。
ルール5:次に、複数の判定領域(球)に係る領域が、それらの判定領域(球)において互いに重なる領域がある場合、重なる判定領域(球)のそれぞれに対して上記ルール4においてそれぞれ割り付けられている数値の和を計算し、単位格子(立方体)に含まれる輝点の状態を示す値として設定する。
なお、この図11においては、上記ルール4までの結果を斜投影図として示し、ルール5の処理の結果の表示を省略している。
なお、本実施形態は、判定領域(球)と所定領域(立方体)をそれぞれ設定したが、単に任意の立体形状の所定領域のみを設定し、各所定領域に含まれる輝点の数に応じた数値を、所定領域に含まれる輝点の状態を示す値としてもよい。
図12を参照し本実施形態におけるSTORM画像における輝点の位置に基づいて、輝点に対応する領域を設定する一態様について説明する。
図12は、本実施形態におけるSTORM画像における輝点に対応する領域の設定方法を示す図である。
(設定方法5:輝点の蜜度に応じて所定領域の大きさを定め、輝点の状態を示す情報に応じた所定の値で埋める(球内を均一に埋める)場合について)
本実施形態において、それぞれの所定領域内に所定の値を割り付ける場合について説明する。
本実施形態の場合は、図12(a)において、図7(a)に示した同一半径の球CR1からCR10と異なり、輝点OR1からOR10の位置を基準にして、互いに半径が異なる球CR1’からCR10’が示されている。図12(b)において、図7(b)に示した同一半径の球CG1からCG11と異なり、輝点OG1からOG11の位置を基準にして、互いに半径が異なる球CG1’からCG11’が示されている。各球は、以下に示すルールに従って生成されている。
ルール1:まず、第1の輝点を基準に隣接する第2の輝点(最も近い輝点)までの距離を半径とする球を検出する。検出した球を第1の輝点に対応する所定領域として定める。所定領域(球)ごとに対応付けられている一つの輝点には、輝点の状態を示す値が予め定められる。例えば、輝点の光子数に比例する数値を、輝点の状態を示す値としてもよい。
ルール2:それぞれの輝点の状態を示す値と、定領域(球)の体積とに基づいて算出される値を、所定領域として示される球内の領域にそれぞれ割り付ける。例えば、第1の輝点の状態を示す情報に基づいた値を、第1の領域を占める大きさ(体積)を示す値で割った結果を第1の領域に含まれる輝点の状態を示す値とする。
なお、複数の所定領域(球)に係り、それらの所定領域(球)において互いに重なる領域がある場合、重なる所定領域(球)のそれぞれに対して上記ルール2においてそれぞれ割り付けられている数値の和を計算し、所定領域(球)の重なる領域の値として計算結果による和を新たに割り付けてもよい。
このルールに従って処理を行うことにより、輝点が存在する密度に応じて定められる大きさの所定領域(球)を設定して処理することができる。輝点が存在する密度が高い場合には、分解能を高めることができ、輝点が存在する密度が低い場合には分解能を下げることができる。このように、輝点が存在する密度に応じて分解能を調整することができることから、演算処理量を、輝点が存在する密度に応じて調整することができるようになり、効率よく解析が行えるようになる。
なお、上述の各実施形態の要件は、適宜組み合わせることができる。また、一部の構成要素を用いない場合もある。また、法令で許容される限りにおいて、上述の各実施形態及び変形例で引用した装置などに関する全ての公開公報及び米国特許の開示を援用して本文の記載の一部とする。
Claims (16)
- 複数の輝点を含む蛍光画像の状態を定量化するための解析装置であって、
前記蛍光画像において、複数の輝点の位置に応じて設定された複数の領域に含まれる前記輝点の状態を数値として定量化する領域設定部
を備える解析装置。 - 前記領域設定部は、
前記輝点の位置から最寄りの他の前記輝点の位置までの距離に応じて前記領域の大きさを定める
請求項1に記載の解析装置。 - 前記複数の領域のうち、少なくとも2つの領域は互いに大きさが異なる
請求項2に記載の解析装置。 - 前記領域設定部は、
前記輝点の状態を示す数値を、前記領域の大きさを示す数値で割った結果を前記領域の状態を示す数値とする
請求項3に記載の解析装置。 - 前記領域設定部は、
前記輝点の位置を中心とする所定の半径に含まれる領域を、前記領域として設定する
請求項1から請求項4の何れか1項に記載の解析装置。 - 複数の前記領域として、第1の領域と第2の領域があり、
前記第1の領域の状態を示す数値を第1の状態値とし、
前記第2の領域の状態を示す数値を第2の状態値とし、
前記領域設定部は、
前記第1の領域と前記第2の領域とが重なる領域がある場合、前記重なる領域の状態を示す数値を第1の状態値と第2の状態値の和とする
請求項1から請求項5の何れか1項に記載の解析装置。 - 前記領域設定部は、
前記領域が単位格子である場合、該単位格子の大きさより大きな大きさの判定領域をさらに設定し、
前記領域の状態を示す数値は、前記判定領域に含まれる前記輝点の状態を示す数値に基づいて設定される
請求項1から請求項6の何れか1項に記載の解析装置。 - 前記領域設定部は、
前記領域を、任意の形状からなる領域に設定する
請求項1に記載の解析装置。 - 前記任意の形状は、格子状の領域の単位格子である
請求項8に記載の解析装置。 - 前記領域設定部は、
前記輝点の状態を示す数値を前記各領域に含まれる前記輝点の数とする
請求項1から請求項9の何れか1項に記載の解析装置。 - 前記領域設定部は、
前記輝点の状態を示す数値を前記各領域に含まれる前記輝点の光子数とする
請求項1から請求項9の何れか1項に記載の解析装置。 - 取得した蛍光画像に含まれる蛍光物質の像の位置を輝点として表すことにより、前記複数の輝点を含む蛍光画像を生成する試料画像生成装置
を備える顕微鏡装置。 - 複数の輝点を含む蛍光画像の状態を定量化するための解析方法であって、
前記蛍光画像において、複数の輝点の位置に応じて設定された複数の領域に含まれる前記輝点の状態を数値として定量化する領域設定過程
を含む解析方法。 - 複数の輝点を含む蛍光画像の状態を定量化するための解析装置のコンピュータに、
前記蛍光画像において、複数の輝点の位置に応じて設定された複数の領域に含まれる前記輝点の状態を数値として定量化する領域設定ステップ
を実行させるためのプログラム。 - 複数の輝点を含む蛍光画像の状態を定量化するための解析装置であって、
前記蛍光画像において、予め設定された複数の領域の各領域に含まれる前記輝点の状態を数値として定量化する領域設定部
を備える解析装置。 - 前記蛍光画像は、3次元蛍光画像であり、
前記領域は、3次元領域である
請求項15に記載の解析装置。
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| WO2018008136A1 (ja) * | 2016-07-07 | 2018-01-11 | オリンパス株式会社 | 画像処理装置および画像処理装置の作動方法 |
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Also Published As
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|---|---|
| US10268033B2 (en) | 2019-04-23 |
| JP6292238B2 (ja) | 2018-03-14 |
| EP3051276B2 (en) | 2026-01-21 |
| JP2018120224A (ja) | 2018-08-02 |
| US10527838B2 (en) | 2020-01-07 |
| JPWO2015046440A1 (ja) | 2017-03-09 |
| EP3051276A1 (en) | 2016-08-03 |
| EP3051276B1 (en) | 2021-03-31 |
| EP3051276A4 (en) | 2017-05-31 |
| JP6587004B2 (ja) | 2019-10-09 |
| US20160202465A1 (en) | 2016-07-14 |
| US20190137754A1 (en) | 2019-05-09 |
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