JPH10173996A - Automatic filter controller and x-ray image diagnostic device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an automatic filter controller in which useless insertion by other filter than a control object filter is prevented and a filter insertion area is calculated at a high speed. SOLUTION: The automatic filter controller 13 is provided with a tomology image memory 131 storing a digital signal from an A/D converter section 9 as tomology image data, a filter assignment means 132 reads angle information of an image intensifier (I.I.) support from a support control section 7 to assign a read control object filter, an insert area calculation section 133 that calculates an insert area of an X-ray compensation filter 4 based on the tomology image data stored in the memory 131 and control object filter information assigned by the means 132 depending on the shape and position of an area over a threshold level preset by using an operation area of the control object filter as an object, and a filter control section 134 that insert/withdraw the X-ray compensation filter 4 to/from the insertion area calculated by the means 133.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention I. The present invention relates to an automatic filter control device that allocates a filter to be controlled based on angle information from a support device, prevents unnecessary insertion of a filter other than the allocated control target filter, and can calculate a filter insertion area at high speed. Further, the present invention relates to an X-ray diagnostic imaging apparatus including the automatic filter control device.

[0002]

2. Description of the Related Art A conventional automatic filter control apparatus of this type stores a fluoroscopic image output from a television camera of an X-ray diagnostic imaging apparatus as image data, as disclosed in Japanese Patent Application Laid-Open No. 8-103436. And a filter insertion area for reading image data from the fluoroscopic image storage apparatus and calculating a filter insertion area of the X-ray diagnostic imaging apparatus based on the shape and position of an area equal to or larger than a preset threshold value There is provided a calculating means and a filter control device for inserting or retracting a filter into the insertion area calculated by the filter insertion area calculating means. Then, the image data used for calculating the filter insertion area targets all the data read from the perspective image storage device, and controls a plurality of filters so as to cover all the areas above a preset threshold value. Was.

[0003]

However, in the conventional filter automatic control device, all the image data read from the fluoroscopic image storage device are targeted, and all the regions above a preset threshold value are covered. In some cases, the filter insertion area generated in the image due to individual differences such as the patient's body thickness and body gas, such as the filter insertion area H shown in FIG. Nevertheless, since the filter is inserted, as can be seen from the insertion region of the lower filter in FIG. 6, there is a problem in that the blood vessel and the filter overlap with each other, resulting in a low density and a decrease in diagnostic performance. Was.

In addition, since the filter insertion area calculation unit performs processing on all image areas read from the perspective image storage device, it takes a long time from the capture of the perspective image to the start of the operation of the filter. there were.

The present invention has been made to address these problems, and has as its object the purpose of angiography. I. By assigning the control target filter from the angle information from the support device, to prevent unnecessary insertion by a filter other than the assigned control target filter,
Another object of the present invention is to provide an automatic filter control device that can calculate a filter insertion area at high speed.

It is another object of the present invention to provide an X-ray image diagnostic apparatus provided with the automatic filter control device.

[0007]

An object of the present invention is to provide a method for measuring a subject
An X-ray source for irradiating X-rays and the X-ray source
I. Detecting X-rays from a source I. And these X-ray sources and I. I. Is supported so that it can rotate at a preset center of rotation. I. An image storage device that stores angiographic images among image fluoroscopic images output from a television camera of an X-ray image diagnostic apparatus having a support device as image data, and image data read from the image storage device and set in advance. Filter insertion area calculation means for calculating a filter insertion area of the X-ray image diagnostic apparatus based on the shape and position of the area equal to or larger than a threshold value, and inserting a filter into the filter insertion area calculated by the filter insertion area calculation means Alternatively, in an automatic filter control device provided with a filter control device for retracting, I. This is achieved by a filter automatic control device comprising: filter assignment means for obtaining assignment information for assigning the filter to be controlled based on angle information from a support device, and outputting the assignment information to the filter insertion area calculation means. You.

An X-ray generator for generating X-rays, a filter provided in the X-ray generation direction of the X-ray generator for attenuating X-rays, and an I.D. I. An X-ray image diagnostic apparatus comprising: a detection image display system that detects the X-rays as an optical image, converts the images into images, and displays the images; and the filter automatic control device that controls insertion or retraction of the filter. Achieved.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an automatic filter control device employed in an X-ray image diagnostic apparatus according to the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing a configuration example of an X-ray image diagnostic apparatus of the present invention, FIG. 2 is a block diagram showing a configuration example of a filter automatic control device 13 of FIG. 1, and FIG. FIG. 7 is a diagram showing a configuration example, and FIG. I. Support device 6
FIG. 8 is a view showing an example of control target filter allocation assigned by the filter allocation means 134 of FIG. 2 based on the angle information of FIG.
Is a schematic diagram showing a processing area for calculating a filter insertion area when the filter to be controlled is allocated to the right filter by the filter allocation means 134 in FIG. 2, and FIG. 9 is a view showing an example of filter insertion according to the present invention. .

First, the configuration of the X-ray image diagnostic apparatus according to the present invention will be described with reference to FIG. X-ray diagnostic imaging apparatus
A bed 2 on which the subject 1 is placed, and the subject 1
X-ray generating unit (X-ray tube) 3 for irradiating X-rays on the X-ray, a filter 4 arranged in front of the X-ray tube 3 to attenuate X-rays to be irradiated, and X I. placed in opposition to the tube 3 to convert transmitted X-rays of the subject 1 into a visible light image; I.
5 and I.I. I. 5 and the X-ray tube 3, and the X-ray tube 3 and the I.D. I. I.5 is supported so that the incident X-ray angle to the subject 1 can be changed while maintaining a preset rotation center. I. The support device 6 and this I.P. I. A support device controller 7 for driving and controlling the support device 6 to a desired incident X-ray angle with respect to the subject 1; I. A television camera 8 for converting and outputting an optical image output from the camera 5 into an electric signal;
A / D that outputs an output signal from a digital signal
A conversion unit 9; an image processing unit 10 that performs image processing on the digital signal from the A / D conversion unit 9 so as to become fluoroscopic image data suitable for diagnosis; and a display unit that displays image data processed by the image processing unit 10. The D / A converter 11 converts the video signal into a video signal, the image display 12 displays the video signal from the D / A converter 11, and the filter 4 based on the fluoroscopic image data from the A / D converter 9. A filter automatic control device 13 for controlling the X-ray tube 3;
An X-ray control unit 14 for controlling the irradiation time of the X-ray, and a console 15 for inputting various information such as X-ray generation conditions from the operator.
And X-ray compensation filter 4, I. I. 5, a central controller 16 for controlling the support device controller 7, the television camera 8, the filter automatic controller 13, and the X-ray controller 14 so as to exhibit the functions described above.

An application of the X-ray image diagnostic apparatus in cardiovascular angiography will be described. FIG. 4 shows the I.D. I. It shows an example of the perspective image obtained with the angle of the support device, the shaded portion in the figure is a region equal to or more than a threshold value preset in the filter automatic control device,
That is, it shows the insertion area of the filter. Further, RAO 30 ° and LAO 60 ° shown in the column of angle information in the figure are defined as shown in FIG. In other words, it indicates the angle of incidence of X-rays (the angle of the II support device) on the subject in the cardiovascular angiography examination, I. Is tilted 30 degrees to the right of the drawing from a state in which it is brought right above the subject, and RAO 30 ° is tilted 60 degrees to the left of the drawing.

It is assumed that the fluoroscopic image data referred to here is limited to angiographic image data typified by cardiovascular angiography. This limitation is based on a technique in which a so-called X-ray incidence angle on a subject alone can be used to substantially specify a filter insertion region when an angiographic image is obtained by an X-ray image diagnostic apparatus (II, as can be seen from FIG. 4). It is empirically known that the filter insertion area is generated at almost the same position in the image if the angle of the supporting device is determined.)

The filter automatic control device 13 is not limited to the fluoroscopic image data output from the A / D converter 9 as described above.
It may be controlled by control data corresponding to fluoroscopic image data such as output of image data of 0.

Next, the configuration of the automatic filter control device 13 shown in FIG. 1 will be described with reference to FIG. The filter automatic control device 13 includes a perspective image memory 131 that stores the digital signal from the A / D converter 9 as perspective image data,
I. I. Filter allocating means 132 for reading the angle information given by the X-ray incident angle of the support device 6 via the central control device 16 and allocating a filter to be controlled.
And the shape and position of an area equal to or larger than a preset threshold value for the angiographic image data stored in the fluoroscopic image memory 131 and the operation area of the filter 4 to be controlled assigned by the filter assigning means 132 Area calculation means 1 for calculating the insertion area of the filter 4 by using
33, and a filter control unit 134 for inserting or retracting the filter 4 in the insertion area calculated by the insertion area calculation means 133.

As shown in FIG. 3, the filter 4 has an upper filter U, a lower filter D, a left filter L,
Each of the blades U, D, L, and R is parallelly moved back and forth or left and right around a display area of a perspective image indicated by a circle in the drawing, By rotating, the size of the opening formed by the four blades is adjusted.

Next, the operation of the X-ray diagnostic imaging apparatus of the present invention will be described.
In particular, the operation of the automatic filter control device will be mainly described.

The X-ray tube 3 irradiates the subject 1 with X-rays.
I. I. 5 receives X-rays transmitted through the subject 1 and
The line is converted into an optical image and the optical image is output on its output surface. The television camera 8 receives the optical image on an imaging surface, converts the optical image into an analog video signal, and outputs the analog video signal. The A / D converter 9 converts the analog video signal into digital data and outputs the digital data. The automatic filter control device 13 stores the digital data from the A / D converter 9 in the perspective image memory 131 as perspective image data. Filter assignment means 1
32 is a signal from the support device controller 7 to the I.D. I. As shown in the example of assigning the control target filter in FIG. I. A filter to be controlled is assigned according to the angle information of the support device. The insertion region calculation unit 133 determines the processing region from the perspective image data stored in the perspective image memory 131 and the control target filter information allocated by the filter allocation unit 132. For example, as shown in FIG. In the case of, the right half area of the image is set as a processing area, and an area (for example, an area where a halation phenomenon occurs) within a predetermined threshold value or more is calculated in the area, and a filter insertion area is calculated from the shape and position. Is calculated. Here, the processing area is the right half of the image. I. The processing area may be set in the upper right part (1/4 of the image) according to the angle of the support device 6. I. It is set in advance according to the angle of the support device 6. FIG. 9 is an example of an image in which a filter is inserted according to the present invention in an image in which a filter insertion region exists at various positions depending on individual differences such as a patient's body thickness and a body gas. I. I. Filter control is not performed on a filter insertion region generated outside of the operation region of the control target filter (the right filter in FIG. 9) assigned by the angle information of the support device 6, and thereby, the communication with the contrast blood vessel is not performed. It is possible to provide images without overlapping.

The filter control section 134 inserts or retracts the filter 4 in the filter insertion area calculated by the insertion area calculation means 133. The image processing unit 10 performs image processing calculations on the digital data obtained by inserting or retracting the filter 4 to display an image suitable for diagnosis on the image display unit 12, and converts the calculated digital data. Output as processing data. D / A converter 1
1 converts the processed data into an analog video signal and outputs it as a front video signal. The image display unit 12 displays the display video signal on a monitor.

As described above, according to the present embodiment,
I. I. By assigning the control target filter based on the angle information from the support device, it is possible to prevent unnecessary insertion by a filter other than the assigned control target filter, and to calculate the filter insertion area at high speed.

[0021]

The present invention has the above-mentioned structures, and these structures operate.
I. By assigning a control target filter based on angle information from a support device, it is possible to prevent unnecessary insertion by a filter other than the assigned control target filter, and to perform a filter insertion region calculation at a high speed. It has the effect of providing.

Further, there is an effect that an X-ray image diagnostic apparatus provided with the automatic filter control device is provided.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration example of an X-ray image diagnostic apparatus according to the present invention.

FIG. 2 is a diagram illustrating a configuration example of an automatic filter control device 13 in FIG. 1;

FIG. 3 is a diagram showing a configuration example of a filter 4 in FIG. 1;

FIG. 4. I. in cardiovascular angiography. I. The figure which showed the relationship between the angle of the support apparatus 6, and the obtained fluoroscopic image example.

FIG. 5 is a view for explaining an example of an incident angle of an X-ray in a cardiovascular angiography examination.

FIG. 6 is a view showing an example of an image when filters are inserted into all filter insertion areas in the image.

7 is a diagram illustrating an example of the perspective image shown in FIG. I. The filter assignment means 13 of FIG.
The figure which showed the example of the control target filter which 4 assigned.

FIG. 8 is a schematic diagram showing an example of a target region of a filter insertion region calculation process when a control target filter is allocated to a right filter by a filter allocation unit 134 of FIG. 2;

9 is a diagram showing an example of filter insertion when the present invention is applied to the image shown in FIG. 6;

[Explanation of symbols]

 13 Automatic Filter Control Device 131 Perspective Image Memory 132 Filter Assignment Means 133 Insertion Area Calculation Means 134 Filter Drive Control Unit

Claims (2)

[Claims] An X-ray source for irradiating a subject with X-rays and an X-ray source
An image intensifier (abbreviated as “II”) that is arranged opposite to the radiation source and detects X-rays from the X-ray source;
And these X-ray sources and I. I. Is supported so that it can rotate at a preset center of rotation. I. An image storage device that stores angiographic images among image fluoroscopic images output from a television camera of an X-ray image diagnostic apparatus having a support device as image data, and image data read from the image storage device and set in advance. Filter insertion area calculation means for calculating an insertion area of a density compensation filter (abbreviated as "filter") of the X-ray image diagnostic apparatus based on the shape and position of the area equal to or larger than the threshold value; An automatic filter control device including a filter control device for inserting or retracting a filter into an insertion region of the selected filter. I. An automatic filter control device, comprising: filter assignment means for obtaining assignment information for assigning the filter to be controlled based on angle information from a support device, and outputting the assignment information to the filter insertion area calculation means. 2. An X-ray generation unit for generating X-rays, a filter provided in the X-ray generation direction of the X-ray generation unit for attenuating X-rays, and an I.V. I. A detection image display system for detecting the X-rays as an optical image by means of a filter, and displaying and converting the X-rays into an image, and the filter automatic control device according to claim 1, which controls insertion or retraction of the filter. X-ray diagnostic imaging device.