JPS6185931A - Tomographic display apparatus - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to the nuclear magnetic resonance phenomenon (Nuclear Magnetic Resonance phenomenon).
The present invention relates to a tomographic display device (hereinafter referred to as an NMR tomographic device) for obtaining tomographic images for medical or industrial use using the NMR tomography (NMR).

[Conventional technology]

Conventionally, there has been a device of this type as shown in FIG. In the figure, (IN- is a normal or superconducting magnet,
(2) is a high frequency (hereinafter referred to as RF) coil, (8) is a bed on which the subject is placed, (4) is a subject such as a human body placed on the bed (8), and (5) is an inclination (not shown). M oblique magnetic field power supply with magnetic field coil, (6) is this system.

(a) is an RF-based interference matching device, (8) is an RP transmitter, (9) is an RF receiver, 0o) is an analog-to-digital converter, o
1) is a central processing unit (hereinafter referred to as CPU), 0@ is a memory, 08) is an input device through which the operator inputs the designation of parameters for data collection, etc., and 0→ is an image display device.

Next, the operation of the above configuration will be explained.

Parameters for data collection are specified from the input device θB), a control signal is sent to the system controller (6), and the signal obtained from the subject (4) is converted from analog to digital via the RF receiver (9). Data for reconstructing both images is collected from the instrument (10). A large amount of data collected by the analog-to-digital converter α is temporarily stored in memory.

Next, when all data collection is completed, CPUQl)
The information in the memo IJ (12) is called up, the data for each processing unit is reconfigured into image information, and the information is output to the image display device (1→) to be displayed as an image.

FIG. 4 is a flowchart showing the above operation.

That is, the control parameter (11a) input from the input device 08) is read by the CP [JCLl),
It is output to the controller (6). Controller (6)
controls the gradient magnetic field power supply (5) and the RF system, and
) and the resulting free induction decay signal, i.e., F I D (Fres Induction
n Decay ) signal is sent analog-to-digital via an RF receiver (9) to an analog-to-digital converter. The analog-to-digital converter αO) converts the sent analog signal into a digital signal to obtain digital image data. Image data from the analog-to-digital converter (101) is collected by (11b) from the CPU (1υ).The data collected by this (Nb) is transferred from CPU (10) to memory (flatly). , is temporarily memorized by this memory scream.After that, Memo!J (
12) transfers data for each processing unit to the CPU (11), reconstructs the image (11c), and displays the image on the image display device 04.
) to output the image for display (11d).

[Problem that the invention seeks to solve]

Conventional NMR tomographic display necks are configured as described above, and when collecting data, the C'PU requires processing such as rearranging the transferred data due to differences in data collection timing and imaging method, so image information is While a huge amount of data is being collected at high speed, the CPU cannot perform image reconstruction processing in parallel with the data collection, resulting in a problem that it takes a long time to display the image.

This invention was made to solve these problems, and it shortens the time from data collection to image display.
The purpose of this research is to obtain an NMR tomography device that can be used.

[Means for solving problems]

The NMR tomography apparatus according to the present invention is provided with two CPUs, a master cpσ and a slave CPσ.

[Effect]

The master CPσ performs sequential data collection, and the slave CPσ performs processing necessary for image reconstruction, such as smoothing and filtering, in parallel with the above.

〔Example〕

FIG. 4 is a block diagram showing an embodiment of the present invention. In the figure, (110) is the master CPσ that constitutes the main central processing unit, (111) is the slave CPσ that constitutes the slave central processing unit, and (120) is the slave CPσ that constitutes the slave central processing unit. ) is memory.

Next, the above configuration will be explained according to the flowchart of FIG. 2. In FIG.
The configuration up to the point where the data is read into the controller (6), outputted to the controller (6), and inputted via the analog-to-digital converter α0) is the same as the conventional one.

Therefore, during data collection (110b), the master CPU collects data for each projection (unit of data obtained at one time from the RF system) and stores it in the memory (120). Thereafter, the slave CPU (111) is activated (110c). Since the slave CPσ (111) can operate independently of the master CPU (110), it performs image reconstruction (111a) using data stored in the memory (120). The image is output to be displayed (110d) on the image display device 0→.

In the meantime, the master CPU (110) collects data for the next projection and stores the data in another area provided in advance in the memory (i20).

As described above, since data collection and image reconstruction processing proceed in parallel, the time from data collection to image display is significantly shortened in proportion to conventional devices.

Note that the apparatus in the above embodiments can be applied to both a single slice (data collection of one tomographic image) and a multi-slice (data collection of multiple tomographic images) of the subject.

Further, as a modification of the master cpσ and slave CPσ described above, the present invention can be similarly applied to an apparatus in which the image reconstruction ability of the slave cpU side is improved by combining the mask CPσ, the slave CPσ, and the array processor. Furthermore, the memories for data collection and image reconstruction can also be provided physically separately.

〔Effect of the invention〕

According to this invention, since two CPUs, a mask CPU and a slave CPU, are provided, data collection and image reconstruction processing can be performed in parallel, thereby shortening the time from data collection to image display. be able to.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an NMRvfr layer device showing an embodiment of the present invention, FIG. 2 is a flowchart showing the operation of the above device, FIG. 3 is a block diagram of a conventional NMR tomography device, and FIG. 4 is a flowchart showing the operation of the above device. In the figure, (1) is a normal conducting or superconducting magnet, (2) is a high frequency coil, (s)? i bed, (4) is the subject, (5
) is a gradient magnetic field power supply, (6) is a controller, (7) is an impedance matching device, (8) is an RF transmitter, (
9) is the RF receiver, (to) is the analog-digital converter, αB) is the input equipment, CI→ is the image display device, (11
0) is the master CPU. (111) is the slave CPσ, and (120) is the memory. In each figure, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] An analog-to-digital converter converts the free induction attenuation signal from the subject obtained using the nuclear magnetic resonance phenomenon into an image data signal, and the image data via this converter is collected and temporarily stored in memory. In a tomographic display apparatus comprising a central processing unit having a means for calling image data obtained by a computer, reconstructing an image, and displaying the image on a display device, the central processing unit is a main central processing unit that performs a process of sequentially collecting image data. The image forming apparatus is characterized by being composed of a device, and a slave central processing unit that operates independently of the main central processing unit and performs a process of recalling image data stored in the memory for each processing unit and reconstructing an image. A tomographic display device.