JPH07116151A - X-ray diagnostic apparatus - Google Patents

Abstract

PURPOSE:To enable the center position of an image on a monitor screen output from a conversion means into optical images to be adjusted with electrical processing by varying a starting position for writing into a storage means in a given area smaller than the whole x-ray receiving surface while watching the output image from the conversion means. CONSTITUTION:For adjustment so that the center of an output image of an image intensifier will be displayed almost at the center of the screen of a TV monitor 12, a process comprising: firstly setting the focus of the lens of an optical system such that the output image of the image intensifier is smaller than the x-ray receiving surface of CCD; writing the image data of CCD at a radiation of x-rays from an x-ray tube 6 into an image memory 10 and displaying the image data on the monitor 12; operating a rotary switch provided at an operating unit 4 so that the center of the output image will be approx. at the center of the monitor screen by an operator while watching the output image displayed on the monitor screen; varying and setting a starting position for writing into the image memory 10 from the x-ray receiving surface.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an X-ray diagnostic apparatus, and more particularly, an output image from a means for converting an X-ray image such as an image intensifier into an optical image is displayed at an appropriate position on a monitor screen. The present invention relates to an X-ray diagnostic apparatus that can be adjusted so that it can be adjusted.

[0002]

2. Description of the Related Art Generally, an X-ray diagnostic apparatus has an X-ray fluoroscopic imaging table and a control section including an image processing section, uses X-rays as irradiation rays, and adjusts the X-ray absorptivity of each part of a subject. The distribution is photographed as a screen film image, or a digital image is formed and image-processed to obtain a perspective image. Usually, a subject is lying on the tabletop of the bed of the X-ray fluoroscopic imaging table, and the bed can be tilted. The X-ray tube and the image intensifier are always arranged so as to face each other across the subject, and the X-ray tube irradiates the imaging region of the subject with X-rays. X-rays emitted from the X-ray tube are partially absorbed by the human body, and the rest reach the image intensifier as transmitted X-rays, and are imaged via an optical system and a CCD camera. The image intensifier converts the transmitted X-rays into an optical image, and the imaging means such as a CCD camera receives the converted optical image. Image data obtained from the CCD camera is output from a CCU (Camera Control Unit), and if necessary, image processing is performed by an image processing unit to obtain an imaged perspective image, which is displayed on a monitor screen.
The X-ray fluoroscopic imaging table includes an over table tube system in which the X-ray tube is located above the top plate and an under table tube system in which the X-ray tube is located below the top plate. The over table tube type has a wider top plate, so it is easy to use when performing various operations on the fluoroscopy table, while the under table tube type uses an image intensifier or film. The image quality is good because it can be brought closer to the subject.

In such an X-ray diagnostic apparatus, the output image of the image intensifier which detects the X-rays emitted by the X-ray tube when the apparatus is installed is displayed on the monitor screen which displays the fluoroscopic image. It must be adjusted so that it is displayed in the proper position. This is to adjust so that the center position of the output image of the image intensifier is displayed at the substantially center position of the monitor screen. The output image of the image intensifier is output to the light receiving surface of the CCD, and the image data from the light receiving surface of the CCD is C
The image is output from the CU, subjected to image processing and the like as necessary, once written in the image (frame) memory, read from the image memory, and the fluoroscopic image is displayed on the monitor. Therefore, since the light receiving surface of the CCD has a one-to-one correspondence with the screen of the monitor, the output image O of the image intensifier is conventionally the light receiving surface R of the CCD as shown in FIG.
If it is out of the proper position, the CCD camera is mechanically moved while observing the output image O so that the center position of the output image O of the image intensifier is almost at the center position of the light receiving surface R of the CCD. I was making adjustments.

[0004]

However, in the conventional X-ray diagnostic apparatus of this type, the operator mechanically operates the CCD camera while watching the output image O of the image intensifier on the light receiving surface R of the CCD. Since the operator was moved and adjusted, the adjuster had to work near the X-ray tube, and there was a problem that there was a risk of receiving a large amount of X-ray irradiation.

The present invention has been made in view of the above circumstances, and an object thereof is to electrically adjust an output image from a means for converting an optical image and a center position of a monitor screen without being exposed to X-ray irradiation. To provide an X-ray diagnostic apparatus that can be operated by remote control.

[0006]

In order to achieve the above object, the present invention has a structure of an X-ray diagnostic apparatus as described below to facilitate the center adjustment. That is, an image pickup device that has a conversion unit that detects an X-ray transmitted through a subject and outputs an optical image, and a light receiving surface that is larger than this optical image, and that picks up the optical image that has entered the light receiving surface and outputs a video signal. Means, a storage means for storing only a video signal corresponding to a specific area smaller than the entire area of the light receiving surface, a display means for visualizing the video signal stored in the storage means, and a display means for displaying the video signal on the display means. An input means for inputting information for changing the specific area based on an image; and a changing means for changing the specific area according to the information for changing the specific area. It is characterized by.

Further, it has a conversion means for detecting an X-ray transmitted through the subject and outputting an optical image, and a light receiving surface larger than this optical image. The optical image incident on this light receiving surface is picked up to generate a video signal. An image pickup means for outputting, a storage means for storing the video signal, a display means for reading out and visualizing only a video signal corresponding to a specific area smaller than the entire area of the light receiving surface from the storage means, and displayed on the display means. An input unit for inputting information for changing the specific region based on the image, and a changing unit for changing the specific region according to the information for changing the specific region. It is characterized by that.

[0008]

According to the above construction, when the video signal from the light receiving surface of the image pickup means is written in the storage means, the write start position is made variable, and only the video signal corresponding to a specific area smaller than the entire area of the light receiving surface is changed. The video signal output from the storage means for storing is visualized and displayed on the screen of the display means, and the writing start position in the storage means in a specific area smaller than the entire area of the light receiving surface while watching the output image from the conversion means. Is adjusted by the input means for changing the specific area to adjust the output image of the converting means and the center position of the screen of the display means. Therefore, not a mechanical adjustment but a position away from the X-ray tube. Can be adjusted electrically (digitally),
The coordinator is not at risk of being exposed to X-rays.

Further, the video signal from the light receiving surface of the image pickup means is once written in the storage means as it is, and the reading start position is made variable when reading out from this storage means, and the read start position is changed to a specific area smaller than the entire area of the light receiving surface. Only the corresponding video signal is read out and visualized and displayed on the screen of the display means,
The read start position is determined by the input means for changing the specific area while observing the output image of the means for converting the X-ray image into the optical image, and the output image of this converting means and the center position of the screen of the display means are adjusted. Therefore, X is not a mechanical adjustment.
Adjustments can be made electrically (digitally) away from the X-ray tube, eliminating the risk of the adjuster being exposed to X-rays.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. The same components as those of the conventional technique are designated by the same reference numerals. FIG. 1 is a schematic view of an embodiment of the X-ray diagnostic apparatus of the present invention. In FIG. 1, reference numeral 1 is an X-ray fluoroscopic imaging table, and the X-ray diagnostic apparatus has a control unit 2 for performing various controls together with the X-ray fluoroscopic imaging table 1. And
The control unit 2 is provided with a CPU 3 for performing overall control, and the CPU 3 is connected with an operation unit 4 for inputting control information such as image processing. A bed 5 for placing an examinee is installed on the X-ray fluoroscopic imaging table 1, and an X-ray tube 6 and an image intensity are sandwiched between the examinee lying on the top plate of the bed 5. A conversion unit 7 having a fire, an optical system and a CCD camera is arranged. In this conversion unit 7, the X-rays emitted from the X-ray tube 6 are partially absorbed by the human body on the top plate, and the rest are imaged as transmitted X-rays.
It reaches the intensifier, is converted into an optical image, and is converted into a video signal through an optical system and a CCD camera. The image data obtained from the CCD camera of the conversion unit 7 is output from a CCU (Camera Control Unit) 8 for controlling the scan of the camera in the control unit 2, and the image data is output under the control of the CPU 3 as necessary. Image processing is performed by the processing unit 9, and is temporarily written and stored in the image (frame) memory 10 that is a storage unit. The digital images stored in the image memory 10 are sequentially read, D / A converted by the D / A converter 11, and displayed on the monitor 12. The control unit 2 also includes a hard disk 13 such as a magnetic disk for recording various information, which is connected to the CPU 3. Further, the raising / lowering operation of the bed 5 is performed by the bed drive control unit 14 under the control of the CPU 3, and the high voltage control for the X-ray tube 6 is performed by the X-ray control control unit 15 under the control of the CPU 3.

In this embodiment, in order to adjust the center position of the output image O of the image intensifier so that it is displayed at substantially the center position of the monitor screen M when the apparatus is installed, the CCD of the image intensifier is adjusted. From the light receiving surface R to the control unit 2
The writing start position can be changed when writing to the image memory 10 therein, and a writing start position adjusting means such as, for example, a rotary switch is provided in the operation unit 4 to perform the variable operation.

Next, the operation / procedure of the center position adjustment in this embodiment will be described. (a) First, as shown in FIG. 2, the output image O of the image intensifier is C
The focus of the lens of the optical system is set so as to be smaller than the light receiving surface R of the CD.

(B) Next, X-rays are emitted from the X-ray tube 6. Then, as shown in FIG. 2, the output image O of the image intensifier is output to the light receiving surface R of the CCD in a state where the respective center positions are displaced.

(C) The image data from the light receiving surface R of the CCD is output from the CCU 8, once written in the image memory 10, read out from the image memory 10, and then D / A.
It is converted 11 and displayed on the monitor 12. Therefore, CC
The light receiving surface R of D corresponds to the screen M of the monitor on a one-to-one basis. Therefore, if it is left as it is, the light receiving surface R of the CCD shown in FIG.
Is set on the monitor screen M only.

(D) Then, the adjuster looks at the output image O of the image intensifier displayed on the monitor screen M and, as shown by the dotted frame M in FIG.
The start position of writing from the light receiving surface R of the CCD to the image memory 10 is digitally changed and set by using the rotary switch provided in the operation unit 4 so that the center position of the image is substantially the center position of the monitor screen M. There is. In FIG. 3, the write start position is adjusted from (A, α) to (B, β).

(E) As a result, as shown in FIG. 4, the output image O is displayed at an appropriate position on the monitor screen M. In the above embodiment, the center position is adjusted by changing the start position of writing from the light receiving surface R of the CCD to the image memory 10, but the light receiving surface R of the CCD is once written and stored in the image memory 10 as it is. The read start position may be adjusted to be variable when read from the image memory 10 and displayed on the monitor screen M. The operation / procedure of the center position adjustment in this case is also a digital adjustment, and in the step (d) above, the "start position of writing from the light receiving surface R of the CCD to the image memory 10" is changed to "image memory 1".
The read start position may be changed from 0.

In the above embodiment, the image processing unit 9 and the image memory 10 are provided in the control unit 2 in the above description.
These may be provided in the CU8, and a write start position or a read start position adjusting means such as a rotary switch may be provided in the CCU8 to perform the same center position adjustment operation / procedure as in the above embodiment. Good. An example of that case is shown in FIG. The CCU 8 has an A / D converter 1 for A / D converting image data obtained from a CCD camera.
6, an image memory 17 for storing the digitized image, an image processing section 18 for image-processing the digital image, D / A conversion for displaying the image-processed digital image on the television monitor 12. A D / A converter 19, a camera control unit 20 for controlling the camera unit connected to the image memory 17 and the image processing unit 18, and a camera I / F 21 are provided. Camera interface 21
Is connected to the CPU 3 in the control unit 2 and transmits control information of the X-ray controller 15 and the like. And
The camera control unit 2 provided on the PC board of the CCU 8
The rotary switch for position adjustment may be arranged at position 0 to adjust the center position in the same procedure as described above. With such a configuration, the device itself becomes compact and simple. In this case, the CCU 8 and the CCD camera may be collectively referred to as an X-ray television camera. In any case, the CCU 8 is one control unit in the X-ray diagnostic apparatus and can be considered as one configuration of the control unit 2.

The center position of the output image O of the image intensifier and the substantially center position of the monitor screen M, that is, the light receiving surface R of the CCD, is determined from the write start position or the read start position determined by the adjusting means in the above embodiment. Is calculated under the control of the CPU 3, and the data of the calculated deviation amount is fed back to the image receiving unit to be automatically or manually adjusted by the calculated deviation amount CC.
The center position may be adjusted by mechanically moving the D camera in the horizontal and vertical directions. In this case, the device may be slightly complicated, but the light receiving surface R of the CCD can be changed by changing the focus setting of the lens of the optical system.
Has a merit that a larger area of can be used as the output image O of the image intensifier. Also CCD
Since it is not necessary to move the camera mechanically while irradiating X-rays from the X-ray tube, it is not necessary for the adjuster to move X-rays as in the past.
There is no danger of being exposed to radiation.

[0019]

As described above, according to the present invention, X
Since the coordinator can digitally adjust the center position by a remote operation without being exposed to the line irradiation, it is possible to reduce the burden on the coordinator and shorten the center position adjustment time. .

[Brief description of drawings]

FIG. 1 is a schematic diagram of an embodiment of an X-ray diagnostic apparatus of the present invention.

Figure 2: Output image of image intensifier and CC
It is a figure for demonstrating the positional relationship of the light receiving surface of D.

FIG. 3 is a diagram showing a positional relationship between a light receiving surface of a CCD and a monitor screen for explaining center position adjustment.

FIG. 4 is a diagram showing a monitor screen when center position adjustment is completed.

FIG. 5 is a diagram for explaining the configuration of a CCU.

FIG. 6 is a diagram for explaining the positional relationship between the output image of the image intensifier and the light receiving surface of the CCD during the conventional center position adjustment.

[Explanation of symbols]

 1 X-ray fluoroscopic imaging stand 2 Control part 3 CPU 4 Operation part 5 Bed 6 X-ray tube 7 Image receiving part 8 CCU 9 Image processing part 10 Image memory 11 D / A converter 12 Monitor 13 Hard disk 14 Bed driving control part 15 X-ray Control unit 17 image memory 18 image processing unit 20 camera control unit

Claims (2)

[Claims] 1. A conversion means for detecting an X-ray transmitted through an object to output an optical image, and a light-receiving surface larger than the optical image. An optical image incident on the light-receiving surface is picked up to generate a video signal. An image pickup means for outputting, and a storage means for storing only a video signal corresponding to a specific area smaller than the entire area of the light receiving surface,
Based on the display means for visualizing the video signal stored in the storage means and the video displayed on the display means,
According to the input means for inputting information for changing the specific area and the information for changing the specific area,
An X-ray diagnostic apparatus comprising: a changing unit that changes the specific area. 2. A conversion means for detecting an X-ray transmitted through an object to output an optical image, and a light receiving surface larger than the optical image, and an optical image incident on the light receiving surface is picked up to generate a video signal. An image pickup means for outputting, a storage means for storing the video signal, a display means for reading out and visualizing only a video signal corresponding to a specific area smaller than the entire area of the light receiving surface from the storage means, and displayed on the display means. Based on the footage
According to the input means for inputting information for changing the specific area and the information for changing the specific area,
An X-ray diagnostic apparatus comprising: a changing unit that changes the specific area.