JP2796110B2 - DSA equipment - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a DSA (Digital Subtraction Angiography) device, and more particularly to a DSA device for automatically setting a recording / photographing number.

[Conventional technology]

The DSA device is a device suitable for knowing the blood flow condition of the blood vessel and the like, and calculates the difference between the captured images before and after the injection of the contrast agent,
This is a device that detects a moving part due to injection of a contrast agent.

In the DSA apparatus, a plurality of images are taken together with the flow of the contrast agent at a diagnostic site for one injection of the contrast agent. The term “plurality” is often around ten times.

It should be noted that there are many cases in which the same diagnostic region is imaged while changing the imaging direction. In this case as well, a plurality of images are taken for one injection of the contrast agent, and two images before and after the plurality of images are selected from the plurality of images, and a difference is obtained to obtain a DSA image.

In such a DSA apparatus, if a period from one injection of a contrast medium to a series of images (for example, 10 images) is defined as one imaging period, each imaging period can be distinguished by the number of imagings (number). Therefore, if the subject identification key code and the photographing number are added to the photographed image, the photographed image can be easily managed. In this case, there is a problem of when to add the shooting number. Conventionally, a photographing number is added to an image when the image is photographed.

For DSA equipment, see “Recent Medical Diagnostic Imaging Equipment” (edited by Hirokazu Kimura. Asakura Shoten. Published in 1988. P-60 ~
P-63).

[Problems to be solved by the invention]

In the above-described conventional example, the photographing number is added at the time of photographing. However, the DSA image is stored once in a storage memory (recording memory), and is read and used. However, there is a drawback that the shooting numbers of the images in the storage memory become discontinuous, making it difficult to perform image management. This will be described below.

In the captured images, there are many examples of failure images (invalid images) due to body movement of the subject. If there is such a failure image,
The image is excluded and a successful image (valid image) is selected as a DSA image. Only the selected DSA image is stored in the storage memory. After storing it in the storage memory, it is displayed or a difference process is performed. What is problematic in the processing after the storage is that the shooting numbers are not consecutive as the management numbers. That is, since the failed image is not stored, the photographing number is discontinuous in the failed image. For example, shooting number 2
Is an unsuccessful image, the photographing number is automatically added in terms of measurement, so that the photographing number 1 is followed by the photographing number 3
Will appear.

Thus, the management is performed by the discontinuous photographing numbers, and the managing side has a disadvantage that the management is difficult to manage because the photographing numbers are discrete.

SUMMARY OF THE INVENTION An object of the present invention is to provide a DSA device capable of continuously adding shooting numbers (synonymous with recording numbers) in a storage memory without skipping.

[Means for achieving the task]

According to the present invention, the photographing number is updated each time a DSA image is recorded in the storage memory.

[Action]

According to the present invention, the addition of the shooting number is not performed at the time of shooting,
Since the image data is stored in the storage memory, a continuous shooting number matching the storage order is added to each image in the storage memory.

〔Example〕

FIG. 3 shows an embodiment of the DSA apparatus of the present invention. This D
The SA device has the following configuration.

Control unit 1: Inputs a command from operation panel 2, X-ray control device 3
(Control of X-ray generation, etc.), control of contrast agent injector 7 (injection command, etc.), control of arithmetic unit 12 (selection of image, obtaining DSA image by difference processing, etc.), control of image memory 13 (Writing and reading control). Besides this
Control of A / D converter 11, movement control of subject 6, TV camera 9
Various kinds of control such as movement control may be performed. This control unit 1 is preferably constituted by a computer.

Operation panel 2 ... A manual operation command section. For example, X
A line generation command, a contrast agent injection command, and the like are manually generated and sent to the control unit 1.

The X-ray controller 3, the high-voltage generator 4, the X-ray tube 5,... Constitute an X-ray generator.

Subject 6, contrast agent injector 7... The contrast agent injector 7 supplies a contrast agent (for example, iodine) having high X-ray transmission and absorption characteristics to the subject 6.
Inject into

Image intensifier (II) 8, TV camera 9,
Telehi camera controller 10... Image intensifier 8 receives transmitted X-rays from subject 6 and generates an amplified light output. The TV camera 9 captures the amplified light output to obtain a captured image. This is so-called shooting. In one shooting period, multiple images (for example, about 10 images) are successively displayed on TV.
Obtain on camera 9. The TV camera controller 10 reads out each captured image and sends it to the AD converter 11. The plurality of images for each single imaging period include an image before the injection of the contrast agent and an image for each time-dependent change in the concentration of the contrast agent after the injection.

AD converter 11, arithmetic unit 12... Arithmetic unit 12 takes in image density data for each image obtained by AD converter 11, obtains one image from these, stores this image in a buffer, (This refers to a plurality of images obtained during one shooting period) as they are, or two images to be subtracted are selected and subjected to a difference process, and the result of the difference process is obtained. Each processing such as obtaining a DSA image is performed (therefore, the DSA image includes both the image before the difference processing and the image after the processing). Difference 2
The two images are one of the images before the injection of the contrast agent and one of the images after the injection of the contrast agent. Further, the operation unit 12
Adds a continuous photographing number to each DSA image when storing the image in the image memory 13 which is a feature of the present embodiment. In addition to the photographing number, a subject identification key is also added for each DSA image.

In the calculation unit 12, if the image moves due to the movement of the subject, the image is excluded from the processing as a failed image. The operator determines whether to go out of the park.

Image memory 13... This memory has a capacity for an image obtained by one photographing. For example, if a maximum of 20 images are to be obtained by one shooting, the capacity of the image is 20 pieces. Further, if the operator confirms a failure during the photographing, the photographed image up to that point is stored in the image memory 13 together with the photographing number. Either resetting and erasing, or leaving the image until the next photographing without erasing it, and overwriting the image obtained at the next photographing and virtually erasing it, is removed by either method.

Recording device 16: a storage memory for storing DSA images. This is a large-capacity file memory such as a magnetic disk or an optical disk. As the image in the recording device 16, a successful image before the DSA processing may be stored in addition to the DSA image. In any case, a subject identification key code and a photographing number are added to the stored image. This photographing number is a continuous number according to the photographing order.

Display unit 14, display device 15... The image in the image memory 13 is read by the display unit 14, converted into a video signal, and displayed on the display device 15. The display device 15 is composed of a CRT or the like.

Regarding the characteristic portion of this embodiment under the above configuration,
This will be described in detail with reference to FIGS. 1 and 2. FIG. 1 shows a processing flow, and FIG. 2 shows an example of an image addition code format.

The image addition code format of FIG. 2 is composed of a subject identification key code and a photographing number as shown in FIG. The subject identification key code includes a subject name code (or a reception code), a subject diagnostic part, and the like.
This is a code for identifying the subject in the image. The shooting number is a number for each shooting section, and is a serial number added to an image for each shooting. For example, an image obtained in the first shooting section is given “1” as a shooting number, and an image obtained in the next shooting section is given “2” as a shooting number.

FIG. 2 (b) is a specific code example, in which "1352-10-35" is given as the identification key code and "1" is given as the photographing number.

FIG. 4 shows an example of the overall operation sequence, in which the subject is first updated (F1). This subject update means that a new subject has been measured. In many cases, a plurality of imagings are performed for each subject.

When the subject update is completed, the photographing operation starts (F2). The imaging operation refers to a series of operations from injection of a contrast agent and X-ray exposure, imaging with a camera, DSA processing, and storage of the captured image in an image memory.

Finally, the recording operation (F3) is started. The recording operation refers to an operation of removing a failed image from the captured DSA images in the image memory and storing only the successful image in the recording memory of the recording device.

FIG. 5 shows the relationship between the photographing order, the photographing number, and the photographed image. Although a photographing number is not added for each photographing order, in the figure, a series of numbers n is considered if there is one photographing, regardless of whether the photographing has failed or succeeded. In the figure, n = 1,2,
3 shows three photographing examples. In each shooting cycle, a maximum of 20 images are obtained. Assuming that a body motion has occurred at n = 2, the operator confirms this and considers the captured six images as failed images and removes them from the recorded image. Then, at the time of storage in the recording memory, the shooting number N is set as
Set as n = 1 → N = 1, n = 3 → N = 2 (shooting number N
Is updated), and this is added to the captured image and stored. still,
In addition to the method based on whether or not a maximum of 20 images have been obtained, there is also a method in which the operator determines whether or not a successful image is not limited to the number, by looking at the shooting status, not the number.

FIG. 1 shows a processing flow for updating the number of times of photographing and for each operation of the present invention. This processing flow is the processing content of the control unit 1 in FIG. First, it is in an operation waiting state. There are three types of operations: subject update, imaging, and recording. The sequence is as follows: subject update → imaging → recording.

When an instruction to update the subject is given from the operation panel 2 by the operator, the control unit 1 sets the value CNT = 1. Here, the value CNT means a shooting number added to an image at the next shooting. This value CNT may be set in the control unit 1 or in the calculation unit 12.

Next, a photographing instruction from the operator enters the control unit 1 from the operation panel 2. The control unit 1 enters a shooting operation. As a result, a photographed image is obtained in the image memory 13 as in the first time (n = 1) in FIG. When this imaging is performed, CNT = 1 is added as the imaging number N, the subject identification key is added, and the flag NEW is set to NEW = "1". The flag NEW is a flag indicating whether an image has been recorded after photographing.

Finally, a recording instruction from the operator enters the control unit 1 from the operation panel 2. The control unit 1 stores the subject identification key, the photographing number, and the photographed images (20 in FIG. 5) in the recording memory in the recording device 16. The subject identification key may be added at the time of this recording.

After recording, check the flag NEW, and if NEW = "1", the value CNT
Is updated to CNT + 1 → CNT. Therefore, last time CNT =
Since it was 1, CNT = 2. At the same time, NEW = "0" is reset.

Thus, the operation from the first photographing to recording is completed. Next, the second shooting is started. If the subject is the same subject, the operation of “update subject” is not performed, and the photographing operation is started. The control unit 1 that has received the photographing operation instruction performs the photographing and sets the CNT set at that time as the photographing number. Actually, CNT = 2. However, in the example shown in FIG. 5, since the second imaging operation has been performed and failed, NEW is not set to “1”, and NEW = “0”. Therefore, even if the next recording instruction is issued, the CNT is not updated because NEW = "0". No records can be made.
Since the failure is determined by the operator, it may be considered that the recording instruction is not originally issued for the failed image. Also in this case, the CNT is not updated and NEW = "0" remains.

In any case, at the time of the third imaging, CNT = 2 remains, and according to FIG.
2 is added as a photographing number and recorded together with the photographed image.

〔The invention's effect〕

According to the present invention, even if there is an invalid image in the photographed images, consecutive photographing numbers are given in the order of storage in the recording device, so that the recording numbers in the recording device become continuous, and management becomes easy.

[Brief description of the drawings]

FIG. 1 is an embodiment diagram of the processing flow of the present invention, FIGS. 2A and 2B are data setting example diagrams, FIG. 3 is an embodiment diagram of a DSA device, and FIG. An example diagram, FIG. 5,
FIG. 4 is a diagram illustrating a relationship among a shooting order, a shooting number, and a shot image. 1 ... Control unit, 2 ... Operation panel, 13 ... Image memory, 16 ...
... recording device.

Claims (1)

(57) [Claims] 1. A DSA device which continuously captures a plurality of images in a single photographing operation, stores the plurality of images in a memory, and records the plurality of images from the memory to another recording device. A DSA device having a photographed image number and a flag indicating whether or not the photographed image has been recorded in the recording device, and updating the next photographed image number at the time of the first recording in the recording device.