JPH04109934A - X-ray imaging device - Google Patents

Abstract

PURPOSE:To obtain an X-ray picture taking device with which a light quantity separation ratio on the output side of an image tube can be changed on the user side by composing to change a gain of a digital cine-picture taking system, picture taking conditions, or both of the gain and the picture-taking conditions corresponding to a change of the light quantity separation ratio. CONSTITUTION:When a switch 14 is pushed, a signal S1 is sent to a S1 control circuit 12, a signal S2 is sent from the control circuit 12 to an optical system 5 to drive a motor 19, and a movable frame 15 moves right to make a change to position a prism reflection mirror 16 on the optical axis of an image tube 4. Simultaneously, a TV gain changing signal S3, a throttle value changing signal S4, and an X-ray condition changing signal S5 are sent to a TV control unit 10, an auto-iris 8, and a high voltage unit 11 respectively to be set at the optimum values for a light quantity separation ratio for the prism reflection mirror after the change. As a result, the light quantity separation ratio of an output image of the image tube guided to a cine-camera and a TV camera of a digital cine-picture taking system can be changed easily, and an X-ray picture taking device which can take ways of thinking and demands of inspection doctors and engineers can be obtained.

Description

[Detailed Description of the Invention] The converted visible image is changed to the X@@fr town visual image, and this converted visible image is divided into two paths with a predetermined light amount using an optical system (light amount splitter), and then sent to a cine camera and a digimole image. A television camera connected to an image processing means is used to capture cine images using a cine camera and digital cine images using a television camera. This invention relates to an X-ray imaging device that performs simultaneous imaging.

[Prior art]

For many years, cine camera equipment has been used for X-ray examinations of the circulatory system, especially the heart, which has a rapid blood flow rate and movement among human organs. Digital cine imaging has begun to be used for cardiac examinations as the resolution and acquisition rates have increased (e.g., radiographs, etc.) in order to shorten the examination time and not increase the amount of contrast medium used.

Cine camera shooting and digital cine shooting are performed simultaneously.

That is, simultaneous X-ray exposure is performed, and the light from the image amblifier is split by an optical system and sent to the ik cine camera and television camera, respectively. Currently, digital cine images are inferior to cine camera images, so digital cine photography is rarely performed alone.

Figure 3 is a diagram showing the configuration of this type of equipment. The X-rays are received by an image intensifier (hereinafter referred to as an image tube) (4), and the transmitted X-ray image is converted into a visible image. This converted image is divided (distributed) at a specific ratio by the optical system (5)
and then guided to a cine camera (6) and a television camera (7). The television camera (7) is equipped with an auto iris (8) to keep the amount of light incident on the image pickup tube within an appropriate range. In addition, the video analog content changed by the television camera (7) is transferred to a digital I equipped with a cine memory and an image processing means (
At step 9), the image is converted into a digital signal and subjected to appropriate image processing and image storage. In Figure 9, aα is the TV control unit) and Qll is the X-ray high pressure device.

Figure 4 is a principle diagram showing an example of an optical system (prism reflector) that uses two prisms to divide the output image of the image tube (4), that is, the light beam, at a specific ratio. ), part of the light incident on side A is reflected by the semi-transparent film to side B (cinema camera side), and the rest of the light is reflected on the total reflection surface.

It is reflected again on six sides (towards the TV camera) by the semi-transparent film. By changing the transmittance of the semi-transparent film, the spectral ratio changes. The light intensity division ratio of the optical system is 9: ], 8:2
．． 5:5 etc. by 11 equipment manufacturers.

Alternatively, various ratios are taken depending on the type of equipment. This ratio is determined by whether you prioritize the image quality of a cine camera or digital cine.

Naturally, more light t is distributed to the side that gives priority in terms of image quality.

Currently, the device manufacturer makes the decision based on its design philosophy.

[Problem to be solved by the invention]

Should you give priority to the image quality of cine photography with a cine camera?

Whether or not to give priority to the image quality of digital cine photography, which uses a television camera and digital imaging means, depends on the thinking and requirements of the examining physician and technician at the hospital using the device.

fii
It changes from time to time.

However, in conventional devices, the light amount splitting ratio of the optical system is fixed, so the user using the device cannot change or switch the light amount splitting ratio to increase the amount of light on the side that prioritizes one image quality. was there.

In view of the above, the present invention determines the light intensity division ratio between the image tube and the output side of the image tube to the digital cine imaging type television camera gJIt depending on the inspection site and inspection purpose.

To provide an X-ray imaging device that can be changed by the user?゛Aim.

[Means to solve the problem]

In order to solve all of the above problems, it is possible to change the light intensity division ratio of the image tube output image to the cine camera and the television camera of the digital cine shooting system, and the gain of the digital cine shooting system is changed according to the change of the light intensity division ratio.

Alternatively, the photographing conditions or both the gain and the photographing conditions may be changed.

[Effect]

According to the above configuration, a cine camera or a television camera is used depending on whether a hospital's examining doctors or technicians place emphasis on cine camera or digital cine photography for the desired image, taking into consideration the purpose of examining the cardiac examination area. The light amount division ratio can be changed so that the amount of light increases.

If you change the light splitting ratio, the amount of light incident on the cine camera and TV camera will change.

The gain of the digital cine imaging system (auto iris aperture, TV gain of the TV camera) and/or X-ray conditions (tube voltage, tube current) changes in conjunction with changes in the light intensity splitting ratio between images taken with a cine camera and images taken with digital cine imaging. are automatically changed to achieve the optimal image quality.

[Sudden example]

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of an X-ray imaging apparatus according to the present invention, and the same components as in FIG. 3 are given the same reference numerals. In the figure, a'aVi control circuit.

131 is a console of the digital cine device, and 141 is a switch for changing the light amount division ratio.

FIG. 2 is a perspective view showing the configuration of the optical system (5) in FIG.
051 is a moving frame with a rank formed on the lower surface supported by a guide mechanism (not shown), and a61a'7) is a moving frame (1
Two types of prism reflectors with different light intensity division ratios are fixed side by side on the moving frame [151], Oa is a pinion that meshes with the rank of moving frame [151], α is a motor that rotates and drives the pinion Ga, and it moves when the motor αα is driven. The frame (151) moves in parallel in the direction of the arrow to position any one of the prism reflectors Cl61 and G71 on the optical axis of the image tube. For example.

If you place importance on the image R of the cine camera, use a reflector (151) with a spectral ratio of 9:1 to increase the amount of light on the cine camera side; conversely, if you place importance on the digital cine image, use a reflector with a spectral ratio of 5:1.
:5 reflector (161) is used to increase the amount of light on the TV camera side. This spectral ratio is just an example, and other ratios may be used.

In the above configuration, when the switch na+i is pressed, the symbol S is sent to the control # circuit αZ, the symbol S2 is sent from the control circuit az to the optical system (5), and this @ symbol is used to control the motor Q9.
1 is driven and 1 moves from the state shown in FIG. 2, for example, to the moving frame 0.
51 is moved to the right, and the prism reflector QEI is switched to be positioned on the optical axis of the image tube (4).

At the same time, a TV gain switching signal 8 is sent from the control circuit C121.
3. Aperture switching signal S4. X-ray condition switching signal 85;
The light is sent to the TV control unit CIQl, auto iris (8), and high voltage device qO1, and is set to the optimum value corresponding to the light intensity division ratio of the switched prism reflector.

[Modification example]

(1) The optical system for switching the light amount division ratio may be constructed by a combination of a half mirror and a total reflection mirror, and the switching method may also be a rotation method.

(2) Instead of operating the pushbutton switch on the console to switch the optical system, the switching may be included as one of the memory items in the acquisition parameter preset function of the digital cine device, and the switching may be done by pressing the preselect button. .

(3) The number of switching stages of the light intensity division ratio is two stages in the embodiment, but
It may be three or more stages, or it may be interlocking variable.

(4) The switching is driven by a motor in the embodiment.

Other method 1 For example, a magnetic plunger may be used.

(5) In the embodiment, the gain of the digital cine imaging system (auto iris aperture value, TV gain) and X-ray conditions are changed in synchronization with the switching of the light intensity splitting ratio. I tried to switch them at the same time, but
Only one of them may be switched.

〔effect〕

According to this invention, it is possible to easily switch the light intensity division ratio of the output image of the image tube guided by the cine camera and the digital cine photography type television camera.

As a result, the following remarkable effects occur.

(1) Diagnostic performance is improved by being able to respond to the ideas and demands of examining physicians and technicians regarding whether to examine primarily film images from a cine camera or images captured by digital cine photography.

(2) Depending on the area to be examined, for example, the left ventricle can be primarily photographed using digital cinema, and the coronary arteries can be primarily photographed with a cine camera.

(3) Depending on the purpose of the examination, digital cine imaging can be used as the main method when the purpose is PTCA treatment.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention.
Fig. 2 is a perspective view showing the configuration of the optical system in Fig. 1, Fig. 3 is a perspective view showing the schematic structure of the imaging section of a conventional X@ photographing device, and Fig. 4 is the principle of light intensity division of the optical system. It is an explanatory diagram. 1: X-ray tube, 2: X-ray collimator, 3: object. 4: Image intensifier 5: Optical system (light splitter), 6: Cine camera. 7: TV camera, 8: Auto iris. 9: Digital image processing means 10: Television control (CCU) 11: High voltage device, 12: Control circuit. 13: Conso/L', 14: Switch. l5: Moving frame 16/17 Niprism reflector 18: Pinion. 19: Motor

Claims (1)

[Claims] (1) The transmitted X-ray image of the subject, converted into a visible image by the image intensifier, is divided at a predetermined light intensity division ratio and guided to a cine camera and a television camera with digital image processing system. In an X-ray imaging apparatus that simultaneously performs digital cine imaging using a cine imaging system, an optical means for changing a light intensity division ratio of an output image of the image intensifier guided to the cine camera and a television camera of the digital cine imaging system; A means for changing the gain and/or the X-ray conditions of the digital cine imaging system is provided, and the gain and/or the X-ray conditions of the digital cine imaging system are changed in connection with the change of the light amount division ratio. X-ray imaging equipment.