JPH10201744A - Degital radio graphic system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to eliminate any difference in the dividing range between a perspective image and a camera image at a division photo-taking, by displaying a same size frame on the perspective image display unit as a division photo-taking size at the division photo-taking. SOLUTION: An X-ray tube 14 irradiates an X-ray onto a to-be-inspected object 16, whose perspective X-ray image is then converted into a visible optical image by an image intensifier(I.I.) 2. The TV camera 4 then converts into the image signals the photo-taken image of the to-beinspected object converted into a visible optical image. The A/D converter 5 then converts the image signals from the TV camera 4 into the digital signals. The image display unit 9 is the one to display the photo-taken images each having been processed. The perspective images are retrieved into the perspective image processor 6 from the TV camera 4 in terms of image signals, by which the images are processed. The perspective image display unit 8 then displays the processed images for observation. The perspective image display unit 8 then displays a same size image frame as a division photo-taking size at the division photo- taking.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a digital radiography apparatus, and more particularly to a digital radiography apparatus suitable for displaying and confirming a photographable range in divided photographing.

[0002]

2. Description of the Related Art A digital radiography apparatus includes a detector that converts transmitted X-rays of a subject into a visible optical image, a television camera that converts an output optical image of the detector into a video signal,
An analog-to-digital converter (A / D converter) for converting the output signal from the television camera into a digital signal;
An image temporary recording device for temporarily recording image data from the D converter or image data after image processing of this image data, an arithmetic unit for performing various image processing on the image data,
An image display device that displays image data recorded in the image temporary recording device as an image, a perspective image processing device that processes a perspective image output from the television camera during fluoroscopy, and a perspective image display that displays the output It is composed of a device and a console for giving various commands to a control device for controlling these components. Various diagnostic images are displayed on the fluoroscopic display device or the image display device by combining the digital radiography apparatus and the X-ray fluoroscopic table, or photographed on a film for diagnosis.

At the time of division photographing by the digital radiography apparatus of such a system, when a division button on the console is pressed, an image intensifier I.D. I. The frame and the perspective image are displayed on the perspective image display device in a frame of the same size as the divided mask arranged between the subject and the subject. The surgeon understands the display range as the imaging range and moves the divided range to the imaging region to perform imaging. The image in the shooting range is displayed on the image display device as a shot image.

[0004] However, a divided photographed image of the digital radiography apparatus is, for example, in the case of quadruple photographing, the I.D.
I. The size of the 512 matrix at the center of is extracted as a photographed image, and the divided image is applied to a quarter of the 1024 matrix.

[0005] This four-division shooting is repeated four times, and processing is performed so that four images are treated as one image. In the case of right and left two-division shooting, the I.D. I. 1024 vertical x 51 horizontal
A two-size image is extracted and applied to a 1024 × 1024 image, and the two-division shooting is performed twice to process as one image.

Further, in the case of the upper and lower two-part photographing, the I.D. I. Extract the image of 512 vertical size x 1024 horizontal size at the center of the image 10
Apply to a 24 × 1024 image. By performing this two-division shooting twice, processing is performed as one image.

[0007] As described above, in a system capable of shooting a film, at the time of division shooting by a digital radiography apparatus,
The division mask of the fluoroscopy table is used for image intensifier I.I. I. The divided mask is displayed as a photographing range together with a perspective image on a perspective display device. Positioning is performed while viewing this perspective image, and photographing is performed.

[0008]

However, since there is a difference between the size of the divided mask and the size processed as a photographed image by the digital radiography apparatus, the size of the divided mask falls within the range of the divided mask when viewed in a perspective image. Image may not be included in the captured image.

This discrepancy is caused by the difference in the method of creating a divided photographed image by the conventional film and the divided photographed image by the digital radiography apparatus as described above.

Hereinafter, the difference between the divisional photographing by the film and the divisional photographing by the digital radiography apparatus will be described with reference to FIG. FIG. 2A shows a divisional photographing in the case of film photographing.
When a fluoroscopic image is confirmed and positioned with a division mask corresponding to the film size, and photographing is performed, a photographed image is cut by the division mask, so that a photographed image having the same size as the perspective image display is displayed on the film. However, for example, in the case of four-division shooting using a digital radiography device,
As shown in FIG. 2B, the subject is photographed, and the photographed image is
After converting the image into an image processing apparatus, the image intensifier I.D. I. The size of 512 × 512 at the center of the image is cut out as a divided photographed image, and 1024 × 102
4 is applied to the image. Four 512 × 512 photographed images are collected and processed as one image. When this is displayed on a film, one image obtained by collecting the divided images is enlarged to a film size to be used and displayed on the film. That is, in the film photographing of FIG. 2A, the division mask size is determined based on the size of the film, whereas in the photographing by the digital radiography apparatus of FIG. Based on size. For this reason, when a conventional division mask is displayed on a fluoroscopic image display device, and division photographing is performed with a digital radiography device based on the mask, what was in the photographing range at the time of fluoroscopy was not displayed in the photographed image. .

In view of the above-mentioned conventional problems, a first object of the present invention is to eliminate a difference in a division range between a perspective image and a photographed image at the time of divided photographing using a digital radiography apparatus. . Accordingly, a second object is to remove the conventionally used division mask mechanism.

[0012]

SUMMARY OF THE INVENTION An object of the present invention is to provide a detector for converting transmitted X-rays of a subject into visible light, an imaging tube or a solid-state imaging device for converting the visible light of the detector into an electric signal,
An analog-to-digital converter (A / D converter) for converting an output signal from the imaging tube or the solid-state imaging device into a digital amount, and an operation for performing various image processing on image data from the A / D converter Device, an image display device for displaying image data from the arithmetic unit as an image, a fluoroscopic image processing device for processing a fluoroscopic image output from the image pickup tube or the solid-state imaging device during fluoroscopic imaging, and a fluoroscopic image processing device In a digital radiography apparatus equipped with a perspective image display device that displays the output of the camera and a console that gives various commands to a control device that controls these components, an image frame having the same size as the divided shooting size at the time of split shooting is provided. Is displayed on the perspective image display device.

By doing so, for example, in the case of four-division imaging, a 512 × 512 size image frame is displayed on the perspective image, and the surgeon positions the imaging region as a division size and performs imaging. Then, since the division size of the digital radiography apparatus and the image frame size of the perspective image match, the lack of a captured image in the divided captured image does not occur. This eliminates the need for a conventional split mask mechanism.

In the digital radiography apparatus configured as described above, when a division button on the console is pressed during division photographing, an image frame indicating the division size is displayed on the perspective image.

This image frame display indicates the size of the photographing range at the time of division photographing of the digital radiography apparatus. For example, at the time of quadrant photography, the perspective image has a quadrant mask and 512
A × 512 size image frame is displayed. If the part desired to be photographed is placed in the image frame display at the time of fluoroscopy, missing of the divided photographed image by the digital radiography apparatus is eliminated. Also,
I. I. Even when the size is changed to 12 inches, 9 inches, or 7 inches and the magnification is changed, the image frame displayed on the perspective image is 1024 × 102 of the scanning line of the perspective display device.
Since the image frame of the 512 × 512 size of the four sizes is displayed, the size is not affected.

As described above, the image frame display is displayed on the fluoroscopic display device at the time of fluoroscopy during the divisional imaging (four divisions, upper and lower two divisions, left and right two divisions), so that the part to be photographed is put in the image frame display. By performing the divided photographing, the photographed image does not fall within the photographing range. In addition, since the divided display range can be performed by the image frame display function, an expensive divided mask mechanism can be removed from the fluoroscopic imaging device, and the cost of the fluoroscopic imaging device can be reduced.

[0017]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is a block diagram showing an embodiment of a digital radiography apparatus according to the present invention. This digital radiography apparatus is an apparatus that irradiates a subject with X-rays, A / D converts an X-ray transmission image of the subject, and allows a captured image to be observed on an image display device.

In FIG. 1, an X-ray tube 14 is
6 for irradiating X-rays onto the top plate 1 on which the subject 16 is placed
Is arranged on one side. Image Intense Fire I. I. Numeral 2 is for converting a transmission X-ray image into a visible optical image.
I. 2 is connected to a distributor 3 for guiding the visible optical image 2 in a predetermined direction. The television camera 4 is I. I. 2
Is a device that converts a captured image of a subject, which has been converted into a visible optical image, into a video signal. The A / D converter 5 converts the video signal from the television camera 4 into a digital signal.

The image display device 9 is a device for displaying a photographed image subjected to each image processing. The perspective image is captured by the television camera 4 as a video signal into the perspective image processing device 6, subjected to image processing, displayed on the perspective image display device 8, and observed.

Further, a division mask 15 is inserted between the X-ray tube 14 and the top plate 1 by a control signal from the control device 12, and a portion to be photographed in the division mask by the perspective image display device 8 is displayed in a perspective image. When performing positioning and photographing during observation, the divided image cut by the division mask 15 is a photographed image between the television camera 4, the A / D converter 5, the arithmetic unit 7, and the image display device 9. Transfer and display. Here, the image frame display function of the present invention will be described.

When the operator presses a division button (not shown) on the console 13 and performs fluoroscopy, the fluoroscopic image displays the division range of the conventional division mask as shown in the four-division mask display of FIG.
If photographing is performed in this state, as shown in FIG. 3B, since the 512 × 512 size differs from the four-division mask display, a part that is not photographed appears in the divided photographed image of the digital radiography apparatus. At this time, 512 × 5
When a 12-size image frame display is created and added to this perspective image and displayed, the perspective image display device 8 displays a perspective image as shown in FIG.

With this method, the image frame display is created by the perspective image processing device 6 for each size of the divided photographing, and if added to the perspective image and displayed, the portion photographed by the divided photographing is displayed on the perspective image display device. You can check. The image frame display type will be described with reference to FIG.

First, a method of creating an image frame will be described with reference to FIG. The method of creating the image frame display is to determine the X coordinate and the Y coordinate,
Display the frame. For example, assuming that the lower left is coordinate 0, an image frame is displayed at an X coordinate of 256 and a Y coordinate of 256 to 768. With such a method, an image frame of 512 × 512 size is created and displayed as shown in FIG. FIG.
The left and right split display of FIG. 4B is displayed in a 512 × 1024 size, and the upper and lower split display of FIG.
Display 2 sizes.

By pressing a division button (not shown) on the operation console, the divided image frame created as described above is displayed on the perspective image processing device by the arithmetic unit 7 according to a control signal from the control device 12. A command is issued as to whether the image is good, and the perspective image processing apparatus creates a divided image frame suitable for the command according to the instruction, and displays the frame on the perspective display device. It should be noted that in the embodiment of FIG. I. Although the television camera 4 is described as an example for converting the output optical image 2 into a video signal, the invention is not limited to this. For example, an apparatus using a solid-state imaging device such as a charge-coupled device two-dimensional sensor may be used. Similar effects can be obtained.

[0025]

The present invention has been configured as described above.
It is possible to prevent missed photographing of a photographed image due to a difference between a divided mask and a photographed image size at the time of divided photographing of the digital radiography apparatus. Further, since the divided image frame is displayed on the perspective image display device, the conventional divided mask mechanism can be removed.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of a digital radiography apparatus according to the present invention.

FIG. 2 is a diagram illustrating a difference between a division photographing size of a film photographing and a digital radiography device.

FIG. 3 is an explanatory diagram until an image frame display created by the perspective processing device is displayed on the perspective display device.

FIG. 4 is a view showing a type of divided image frame display and a creation method.

[Explanation of symbols]

 1 Top plate 2 Image intense fire I. I. Reference Signs List 4 TV camera 5 A / D converter 6 Perspective image processing device 7 Computing unit 8 Perspective image display device 9 Image display device 12 Control device 13 Operation console 15 Division mask

Claims (2)

[Claims] 1. A detector for converting X-rays transmitted through a subject into visible light, an imaging tube or solid-state imaging device for converting visible light from the detector into an electric signal, and a detector from the imaging tube or solid-state imaging device. An analog-to-digital converter (A / D converter) for converting an output signal into a digital amount, an arithmetic unit for performing various image processing on image data from the A / D converter,
An image display device that displays the image data from the arithmetic unit as an image, a perspective image processing device that processes a perspective image that is an output from the imaging tube or the solid-state imaging device during fluoroscopy, and an output of the perspective image processing device. A perspective image display device for displaying;
In a digital radiography apparatus having a console for giving various commands to a control device for controlling these components, an image frame of the same size as the divided photographing size is displayed on the perspective image display device at the time of divided photographing. Digital radiography device characterized by the following. 2. The digital radiography apparatus according to claim 1, wherein the image frame is created by the perspective image processing device and is displayed on the perspective image display device.