JPS60194936A - X-ray vessel image fluoroscopic 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 Field of Application of the Invention The present invention relates to X-ray angiographic fluoroscopic imaging in which an angiographic examination of the head, neck, abdomen, limbs, etc. is performed by injecting a contrast medium into the body of a subject through a vein. The present invention relates to an apparatus, and particularly to an X-ray vascular image fluoroscopic photographing apparatus which is pressurized so that when a subject undergoes body movement during contrast imaging, shadows obstructed by the body movement can be removed or mask processing can be easily performed.

Prior Art and Problems In conventional X-ray angiography fluoroscopic imaging systems, it is difficult to remove shadows or perform mask processing due to body movements of the subject (displacement of the body position on the imaging table) during contrast imaging. First, operate the keyboard of the device to input the program for remasking processing, and then enter the frame memory number of the mask image before contrast imaging and the frame memory of the live image during contrast imaging near where the body movement seems to have occurred. Specify the number using the keyboard above, perform subtraction between the two to find the live image where the obstacle shadow appears, then set that live image as a new mask image, and set the frame memory number of the subsequent live image. The subtraction was performed by sequentially specifying the above keyboard, and the reprocessed image was displayed. However, in this case, inputting the above program and specifying frame memory numbers for mask images and live images are all done by operating the keyboard.
There were times when I had to repeatedly specify the frame memory number of a live image in the vicinity where a body movement seemed to have occurred based on trial and error. In addition, setting a new mask image and specifying the live image (r) 7L/-me memory number for subsequent subtraction all require keyboard operations, making operations for remasking extremely complicated and time-consuming. This was the case.

Purpose of the Invention The present invention has been made to solve the above-mentioned problems, and provides a method for easily and quickly removing obstructive shadows caused by body movements and masking when a subject moves during contrast imaging. An object of the present invention is to provide an X-ray blood vessel image fluoroscopic imaging device that can perform

SUMMARY OF THE INVENTION According to the present invention, while injecting a contrast medium into the body of a subject, an X-ray generator is used to irradiate K-X-rays to the imaged area of the subject. The transmitted X-rays are
The video signal is detected by a line TV camera and converted into a video signal, and this video signal is converted into a digital signal by an image processing unit, and an arithmetic unit performs image processing by adding and subtracting, and converts the output into an analog signal. In an X-ray angiography fluoroscopic imaging system that displays images on an image monitor, there is a large-sized device that can write and read out all images of the pre-contrast mask image of the imaging area and the live image during imaging in real time on the output side of the arithmetic unit. In addition to providing a recording medium with a large capacity, a subtraction image is displayed by calculating between the mask image before contrast imaging and the live image during contrast imaging between each frame memory of this recording medium, and the image during contrast imaging is displayed on the operation panel. In addition to providing an operation button to remove shadows caused by body movements of the subject, this operation button sets the live image after the body movement as a new mask image, and calculates between it and the subsequent live image. This is achieved by providing an X-ray blood vessel image fluoroscopic photographing apparatus characterized in that it displays a reprocessed image.

Embodiments of the Invention Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a block diagram showing an X-ray blood vessel image fluoroscopic imaging apparatus according to the present invention. The X-ray generator 1 irradiates X-rays to the imaging site of the subject 2, and controls X-ray generation in response to a control signal from the X-ray control interface 4 of the image processing unit 3. Line control device 5, high voltage generator 6, and X
It consists of 7 wire tubes. An X-ray television camera 8 is provided at a position facing the X-ray tube 1 with the subject 2 in between. This X-ray television camera 8 detects the X-rays that have passed through the imaged part of the subject 2 using an image intensifier (■.■,) 9, converts this into a video signal using an optical system, and outputs it. It is something to do.

The output side of the X-ray television camera 8 is converted into an NΦ converter 11 via a television camera control section 10. An arithmetic unit 13 is provided on the output side of the Φ converter 11 via a logarithmic amplifier 12. This arithmetic unit 13 takes in the digital signal logarithmically converted by the logarithmic amplifier 12, superimposes and adds or subtracts a plurality of digital images of a mask image before contrast imaging and a live image during contrast imaging, and performs desired image processing. This is what we do.

The output side of the arithmetic unit 13 is equipped with a large capacity recording medium 14. This recording medium 14 is, for example, a video disk, a large capacity memory, a high speed magnetic disk, etc., and a 7V memory 14 a + . . . 1 as an image file.
4n has, for example, 22 frames, and is configured so that all images of the mask image before contrast imaging and the live image during contrast imaging of the imaging region can be written and read out in real time at the time of imaging. Here, each of the frame memories 14a, . . . 14
For example, the role of n is as follows.

First frame memory 14a...stores a mask image; second frame memory 14a;
Frame memory 14b... stores live image (1) 3rd frame memo January 4c stores live image (2) 2nd
2 frame memories 14n...store live images (21), and each of these frame memories 14a.

...14n, the mask image in the first frame memory 14a and the live image (1) in the second frame memory 14b
subtraction image (1) is output by subtraction between the mask image in the first frame memory 14a and the live image (2) in the third frame memory 14c)
) to output the subtraction image (2) (see FIG. 3(b)), and the following subtraction images are sequentially output in the same manner. Since the contrast of the subtraction image output in this way is very small,
As shown in FIG. 1, the contrast is emphasized by the enhancement cycle M15a#15b.

On the output side of the engine circuit 15a #15b, V
An A converter 16 is provided, and this D/A converter 16
The subtraction image is converted into an analog signal. An image monitor 17 is connected to the D/A converter 16, and a processed image of the blood vessel at the imaging site is displayed on the image monitor 1T.

The image processing section 3 is provided with an operation panel 18, as shown in FIG. This operation panel 18 performs all operations for angiography using the X-ray angiography fluoroscopic imaging device in a one-touch manner. Here, in the present invention, as shown in FIG. 2, a glue mask processing operation section 19 is provided on the operation panel 18 to remove shadows that are obstructed by the operation of the patient 2 during contrast imaging. The remask processing operation section 19 has a remask button 20, an increment button 21, a decrement button 22, and a set button 23 as operation buttons. The remask button 20 is used to instruct the start and end of remask processing, and the increment button 21 is used to designate a live image after the current live image and subtract it from the initial mask image to perform subtraction. The decrement button 22 is used to specify a live image immediately before the current live image, subtract it from the initial mask image, and display a subtraction image. Yes, the set button 23 is
When a live image immediately after 0 rest is found, that live image is designated as a new mask image.

Next, each operation of the remasking operation section 19 will be described with reference to the flowchart shown in FIG. 4. First, as shown in FIG. 1, a catheter for injecting a contrast medium into a vein in an arm or leg is inserted into the subject 2. When the start button of the apparatus is pressed in this state, a contrast medium injection start signal is sent from the interface 4 of the image processing unit 3, the injector 24 is activated, and the contrast medium is injected as shown in FIG. is started (25). Next, an X-ray exposure signal is sent from the interface 4 to the X-ray control device 5, and the X-ray tube 7 emits X-rays to the imaged area of the subject, resulting in a mask image (Fig. 3 (a) )). This mask image reaches the recording medium 14 via the Φ converter 11 and the arithmetic unit 13, and is transferred to the first frame memory 14a.
is stored in Next, after waiting for time for the injected contrast medium to circulate to the imaging site, X-rays are emitted from the X-ray tube γ to the imaging site, and the live image (1) (Fig. 3 (a)
(see). This live image (1) reaches N■ and is stored in the second frame memory 14bK. Below, X-ray exposure is performed at predetermined time intervals, and live images (2),
Live images (3), . . . are photographed and stored in the third frame memory 14c and fourth frame memory 14, respectively.
d1...K are stored.

Here, it is assumed that the subject 20 moves between the live image (2) and the live image (3) as shown in FIG. 3(a). At this time, since the shadows of the skeleton etc. in the mask image and the shadows of the skeleton etc. in the live image (3) are misaligned, subtraction is performed between the mask image and the live image (3). Obstacle shadows will appear in the subtraction image (3). Therefore, in order to remove the above-mentioned obstruction shadow, each operation button 20, 2 of the remasking operation section 19 shown in FIG.
Operate 1, 22 and 23. izu, remask button 2o
When is pressed, the remasking process is started as shown in FIG.

Here, it is checked whether the remask button 20 has been pressed as a signal to start the remask process (A). If you press the remask button 20 correctly, proceed to the “YES” side,
The first frame memory 14a of the recording medium 14 is designated (B). Then, the mask image before contrast is read out from the frame memory 14a and displayed on the image monitor 17 (C
). Next, in order to search for a live image in which an obstacle shadow occurs, the increment button 21 is pressed to advance the live images one by one. Here, when the increment button 21 is pressed - times, the frame memory number advances by one, but it is checked whether the frame memory number is the final one (see reference numeral 14n in Fig. 1) (D). . This is because when the last frame memory 14n has already been reached, it is no longer necessary to perform mask processing. If the frame memory number is not yet the final one, proceed to the NO'' side, advance the frame memory of the recording medium 14 by one, and specify the second frame memory 14b (E).Next, the first
mask image in the frame memory 14a and live image (1) in the second frame memory 14b, ! : is input to the arithmetic unit 13 (F). Then, in the arithmetic unit 13 (mask image)
- (live image) is executed to display the subtraction image (1) shown in FIG. 3(b) (G). When looking at this subtraction image (1), if there is no obstructive shadow, return the operation button to the input position (2) to advance the live image further, and wait for the next operation. In this case, the user further presses the increment button 21 and repeats the same flow as above to sequentially display the subtraction image (2) and the subtraction image (3) (G). Here, as shown in FIG. 3(a), it is assumed that there is a body movement between the live image (2) and the live image (3).
), a shadow of the disorder is observed.

However, when the increment button 21 is pressed again to advance to the live image (4) and the subtraction image (4) is examined, if a shadow of the disorder is also recognized in this subtraction image (4), the live image immediately after subject 2's body movement is detected. is determined to be the above live image (3).

Therefore, next, in Fig. 4, the decrement button 22
Press. Here, when the decrement button 22 is pressed - times, the frame memory number returns by one, but it is checked whether the frame memory number is 2 or less (only numbers 14a and 14b in Fig. 1). . (). This is because there is no need to perform remask processing when returning to the second frame memory 14b from the beginning.And if the frame memory number is not 2 or less, No.
'' side, move back one frame memory of the recording medium 14 and specify the fourth frame memory 14d (I). Next, the mask image of the first frame memory 14a and the mask image of the fourth frame memory 14d are Live image (3) and computing unit 13
(J). Then, the arithmetic unit 13 executes the calculation (mask image) - (live image), as shown in FIG. 3(b).
The subtraction image (3) shown in (I()) is displayed.

Naturally, a shadow of the disorder is recognized in this subtraction image (3).

Next, the set button 23 is pressed in FIG. As a result, the returned live image (3) is designated as a new mask image (L). As a result, the live image (3) is read out from the fourth frame memory 14d and displayed on the image monitor 11 as a new mask image (M). and,
This time, with the new mask image set, return to the input position of the operation button, press the increment button 21, and repeat 70- of E, F, G. After remasking, the subtraction image with the obstructed shadow removed is created. are displayed one after another, and finally the remask button 2o is pressed to end the remask process. The steps of the above-mentioned glue mask processing are as shown in the following table. Effects of the Invention As explained above, the present invention provides a mask image of the imaging region before contrast imaging and a mask image during contrast imaging on the output side of the arithmetic unit 13. A large-capacity recording medium 14 is provided on which all images of the live image can be written and read in real time at the time of imaging, and on the operation panel 18 there is a recording medium 14 for removing obstructive shadows caused by body movements of the patient 2 during contrast imaging. Since operation buttons 20, 21, 22, and 23 are provided,
By simply pressing the button, you can view the subtraction images sequentially in the time direction in a one-touch manner, making it easy to find the live image immediately after subject 2's body movement, and use that live image as a new mask. Can be set as a statue. Furthermore, the display of the subtraction image between the new mask image and the subsequent live image can also be performed with a one-touch button operation. Therefore, the operation for remasking processing can be performed easily and quickly, and its operability can be improved.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the X-ray blood vessel image fluoroscopic imaging apparatus according to the present invention, FIG. 2 is a plan view of the main parts showing the mask processing operation section on the operation panel, and FIG. 3 is the video signal readout and output monitor. FIG. 2 is a timing diagram with an image and a flowchart showing a procedure for M4 beam mask processing. FIG. DESCRIPTION OF SYMBOLS 1... X-ray generator, 2... Subject, 3... Image processing unit, 7... X-ray tube, 8... X-ray television camera, 11...
... Le Φ converter, 13 ... Arithmetic unit, 14 ... Recording medium, 14a, 14b ... 14n ... Frame memory, 1
6... D/A converter, 1γ... Image monitor, 18... Operation panel, 19... Remask processing operation section, 20... Remask button, 21... Increment button, 22. ...Decrement button, 23...Set button. Applicant Hitachi Medeico Co., Ltd.

Claims (1)

[Claims] While a contrast medium is injected into the body of the patient, an X-ray generator is used to emit X-rays to the area of the patient to be imaged, and an X-ray television camera detects the X-rays that have passed through the patient. This video signal is converted into a digital signal by an image processing unit, and an arithmetic unit performs image processing by addition and subtraction, converts the output into an analog signal, and displays this processed image on an image monitor. In the X-ray angiography fluoroscopic imaging device, all images of the mask image before contrast enhancement and the live image during contrast enhancement of the imaging region are written in real time at the time of imaging to the output side of the arithmetic unit;
In addition to providing a readable large-capacity recording medium, 1. between each frame memory of this recording medium, calculations are performed between the mask image before contrast imaging and the live image during contrast imaging to display a subtraction image, and the subtraction image is displayed on the operation panel. is provided with an operation button to remove obstructive shadows caused by body movements of the subject during contrast imaging, and with this operation button, the live image after the body movement is set as a new mask image, and the subsequent live image is set. An X-ray blood vessel image fluoroscopic imaging apparatus characterized in that a reprocessed image is displayed by performing calculations between the two.