JPH0152019B2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to an X-ray diagnostic device.

Conventional X-ray fluoroscopy equipment used for this type of equipment is limited by the detector, which requires the X-ray dose to be set low, so still images of the subject can only be obtained with low density resolution. Therefore, although it is used as a device to determine the imaging position of the subject or as a device to inject a contrast agent into the subject and observe a moving image, it is not suitable as a device to obtain still images of the subject. The drawback was that it was not suitable for practical use. In addition, conventional so-called image intensifier (II) indirect photography devices use film, which has the disadvantage that the gradation width is small and image processing is difficult, which also makes them unsuitable for practical use. It was hot.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an X-ray diagnostic apparatus that can obtain images with high concentration resolution not only for moving images of a subject but also for still images. It is something to do.

The present invention will be specifically described below based on Examples.

FIG. 1 is a block diagram showing one embodiment of the present invention, in which 1 is a pulse block diagram including a controller that can adjust the intensity of X-rays generated in a pulsed manner and an aperture that can adjust the irradiation field of the generated X-rays. X-ray generator, 2 is the subject, 3
4 is an image intensifier (II) that amplifies the X-rays generated from the pulse X-ray generator 1 and transmitted through the subject 2 and converts them into light; 4 is a lens that focuses the light generated from II3; 5 is composed of m unit detectors arranged in a two-dimensional plane, and is a two-dimensional detector (for example, an image pickup tube) that detects the light focused by the lens 4 as a two-dimensional plane; 6 is a two-dimensional detector 5; 7 is a television monitor that displays an image based on the analog information output from the analog signal multiplex output device 6. Reference numeral 8 denotes a pedestal, at one end of which a pulsed X-ray generator 1 is installed.
is attached, and an II3, a lens 4, and a two-dimensional detector 5 are attached to the other end, and the pedestal 8 is connected to a pedestal control lever 2 provided on the operation panel 9.
1 (see Fig. 2), it is configured to be movable up and down, left and right, and forward and backward relative to the subject 2.
By positioning this pedestal 8, the pulse X-ray generator 1
The distance from which X-rays are irradiated to the subject 2 and the X-ray irradiation field can be adjusted. The operation panel 9 is also provided with l pushbuttons 22, as shown in FIG. When an arbitrary push button 22 is pressed, the calculator 12 operates to adjust the pulse X-ray generator 1 according to the selected number (n) and the set time interval. X-rays are now being generated from 10
is the analog signal multiplex output device 6 in accordance with information acquisition control from the computer 12 (for example, CPU).
Analog/digital (A/D) that captures analog information output from the
D) The converter 11 is a transmission information storage device (for example, a frame memory) that stores the digital object transmission information output from the A/D converter 10, and the object transmission information stored in this is: The information is sequentially rewritten every time X-rays are emitted in a pulse form from the pulsed X-ray generator 1, and the stored information immediately before the rewriting is sequentially retrieved by the function of the computer 12 to a multiple storage device 13, which will be described later. .
Reference numeral 13 denotes a multiple storage device having a bit number larger than that of the transmission information storage device 11 by at least (l _o n)/(l _o 2), and each time the object transmission information is taken out from the transmission information storage device 11, The extracted object transmission information and the object transmission information already stored in the multiple storage device 13 are added for each pixel by the function of the computer 12, and the addition result is re-stored. . Reference numeral 14 indicates that the object transmission information obtained by irradiating X-rays a set number of times, which is generated in a pulsed manner from the pulsed X-ray generator 1, is added for each pixel, and then logarithmically converted by the operation of the computer 12. An image storage device stores image information obtained through image processing, and 15 is an image display device that displays the image information.

Next, the operation of the apparatus configured as described above will be explained. If you want to obtain only a moving image of the subject 2, generate X-rays from the pulsed It is detected as a two-dimensional surface by the dimension detector 5, and the analog signal multiplex output device 6
The moving image of the subject 2 is displayed on the TV monitor 7 through the TV monitor 7 . Also, if you want to obtain a still image of subject 2,
While viewing the image on the television monitor 7, the gantry 8 is appropriately moved, positioned, and fixed by operating the gantry control lever 21 so that the target region of the subject 2 fills the screen of the television monitor 7. Then press any pushbutton 22 to pulse
A ray generator 1 generates n X-ray pulses at set time intervals. Analog signal multiplex output device 6 provides information on object penetration by the first X-ray exposure.
The data is stored in the transparent information storage device 11 through the A/D converter 10. Before the object transmission information from the second X-ray exposure reaches the transmission information storage device 11, the object transmission information from the first X-ray exposure is retrieved from the transmission information storage device 11 and multiplexed. The object transmission information resulting from the second X-ray exposure is transferred to the storage device 13 and stored in the empty transmission information storage device 11. Before the object transmission information from the third X-ray exposure reaches the transmission information storage device 11, the object transmission information from the second X-ray exposure is retrieved from the transmission information storage device 11. This and the object transmission information from the first X-ray irradiation stored in the multiple storage device 13 are added for each pixel, and the addition result is the multiple storage device 1
3, and the object transmission information resulting from the third X-ray exposure is stored in the transmission information storage device 11. Thereafter, in the same manner, all of the object transmission information obtained by n times of X-ray exposure is added for each pixel, and then logarithmically transformed by the computer 12 and image processed.
The image is stored in the image storage device 14 and displayed on the image display device 15. Therefore, the image display device 15 displays a still image of the subject 2 having a density resolution that is √ times better than the density resolution of an image obtained by just one X-ray exposure. becomes. Here, the processing for displaying the still image is automatically performed simply by controlling the A/D converter 10 with a signal from the CPU 12 and synchronizing with other circuits.

In the above embodiments, the transparent information storage device 11 or the multiplex storage device 13 is described as having an area for storing one frame, but the invention is not limited to this. A storage device having a large number of storage areas may also be used. In this way, the writing, reading, addition processing, etc. can be performed more quickly.

Since the present invention is configured as described above, it is possible to obtain images with high concentration resolution not only for moving images of the subject but also for still images, and therefore the subject can be observed precisely, making it extremely useful for medical diagnosis. It is possible to provide an X-ray diagnostic device that is effective, simple to operate, and easy to handle. Furthermore, since information that has been digitized is used for image processing, there is an advantage that inconveniences such as noise being added to the processing path can be eliminated. Further, there is provided an object transmission information means for sequentially rewriting and storing the information for each generated pulse of the pulsed X-ray, and at least (n
a multiple storage means having a bit number larger by n/ln2), and each time the object transmission information is extracted from the object transmission information storage means, the extracted object transmission information and the multiple storage means are already stored in the multiple storage means. Since the object transmission information is added for each pixel, it is possible to obtain a still image with a wide gradation range, which allows for a dynamic range that simultaneously shows the lung field and bones. Even in large areas, lesions can be clearly extracted.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention;
FIG. 2 is a schematic diagram showing the operation surface of the operation panel. 1... Pulse X-ray generator, 2... Subject, 3... Image intensifier (II), 4... Lens, 5
...Two-dimensional detector, 6...Analog signal multiplex output device,
7... TV monitor, 8... Mount, 9... Operation panel,
10...Analog/digital (A/D) converter,
11...transparent information storage device, 12...computer, 13...
Multiple storage device, 14... Image storage device, 15... Image display device, 21... Frame control lever, 22
...Push button.

Claims (1)

[Claims] 1. An image intensifier that projects an optical image based on X-rays transmitted through a subject, a two-dimensional detector that detects two-dimensional subject transmission information based on the optical image, and a An X-ray diagnostic apparatus having an image display means for displaying an image based on a signal, at least an operation unit capable of generating pulsed X-rays and specifying the number of pulses, and an output signal from the two-dimensional detector. multiple output means for guiding in two or more directions; a moving image display means for displaying the multiple output signals distributed by the multiple output means and obtained for each generated pulse of the pulsed X-rays as a moving image; The object to be examined is distributed by the multiplex output means in a direction different from the image display means, and stores the object transmission information while sequentially rewriting each generated pulse of the pulsed X-rays, and outputs the object information immediately before being rewritten. transparent information storage means;
It has a predetermined capacity, and each time the object transmission information is output from the object transmission information storage means, the output object transmission information and the already stored object transmission information are stored for each pixel. An X-ray diagnostic apparatus comprising: multiple storage means for adding and storing information; and still image display means for displaying object transmission information stored in the multiple storage means as a still image.