JPH0810250A - X-ray ct scanner - Google Patents

Abstract

PURPOSE:To provide an X-ray CT scanner capable of securing an access space widely for a testee inserted to a testee insertion hole. CONSTITUTION:An opening part 14 opened from the side plane of a main body cover 6 to the side part of the testee insertion hole 5 is provided on the front side part of the main body cover 6, and a cover member 15 which covers the opening part 14 is provided freely slidably on the rear side of the main body cover 6.

Description

Detailed Description of the Invention

[0001]

This invention relates to X-ray CT (Computation).
erized tomography) The present invention relates to an X-ray CT scanner used when obtaining an image.

[0002]

2. Description of the Related Art Conventionally, this type of X-ray CT scanner has a subject insertion hole in the center of the front surface of a body cover forming a gantry, and an X-ray is emitted to a subject inserted into this subject insertion hole. X-ray projection data is obtained by irradiating from multiple directions, and the obtained projection data is reconstructed to obtain a CT image.

Since such an X-ray CT scanner uses a multi-channel type X-ray detector as a means for obtaining X-ray projection data, it is possible to obtain a CT image having high spatial resolution and density resolution. For example, it is possible to find a minute lesion part having a diameter of about 5 mm from a CT image.

However, the conventional X-ray CT scanner does not have a fluoroscopic function and cannot display the positions of the biopsy needle and the catheter in real time. Therefore, when performing a percutaneous biopsy on a lesion found from a CT image, an X-ray fluoroscope capable of obtaining a fluoroscopic image is prepared, and the fluoroscopic image obtained by the X-ray fluoroscopic apparatus is displayed on the display device. The position of the biopsy needle or catheter is confirmed by displaying on the screen, but the resolution of the fluoroscopic image obtained by the above-mentioned X-ray fluoroscopic device is not so high as that of the CT image, and therefore the qualitative diagnosis of the lesion site is fluoroscopically performed. It could not be done only with images.

[0005]

Therefore, in order to deal with such a problem, the applicant of the present application first applied for an X-ray CT scanner having a fluoroscopic function (Japanese Patent Application No. 6-240).
No. 86). This X-ray CT scanner uses a two-dimensional detector having a large number of X-ray detection elements arranged in the circumferential direction and the depth direction of the subject insertion hole as an X-ray detector, and collects the output of this X-ray detector as data. Then, the perspective image is displayed on the display device.

However, in such an X-ray CT scanner, the body cover is an obstacle when a fluoroscopic image is displayed on the display device to perform a percutaneous biopsy, and the subject is inserted into the subject insertion hole. On the other hand, there is a drawback that a percutaneous biopsy cannot be performed from the outside of the main body cover.

The present invention has been made in view of the above problems, and an object thereof is an X-ray C which can secure a wide access space for a subject inserted into a subject insertion hole.
It is intended to provide a T-scanner.

[0008]

In order to solve the above problems, the present invention is directed to a main body cover having a subject insertion hole in the center of the front surface, and a vertical body provided in the main body cover with the subject insertion hole as the center. Rotation frame that rotates in a flat plane, an X-ray tube that is attached to the rotation frame and irradiates the subject inserted into the subject insertion hole with X-rays, and the rotation frame that faces the X-ray tube And an X-ray detector for detecting X-rays transmitted through the subject, the X-ray CT scanner comprising: a front side portion of the body cover; It is characterized in that an opening opening to the side is provided, and a cover member for closing the opening is slidably provided at the rear of the main body cover.

[0009]

In the above structure, when the cover member for closing the opening formed on the front side of the body cover is slid to the rear of the body cover, the access space is formed on the front side of the body cover. Therefore, a percutaneous biopsy is performed through the access space formed on the front side of the body cover so that the body cover does not get in the way and does not interfere with the subject inserted into the subject insertion hole. A skin biopsy can be performed from outside the body cover.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to FIGS.
Will be described with reference to. FIG. 1 shows an X-ray CT scanner according to an embodiment of the present invention, and an X-ray CT scanner according to an embodiment of the present invention, as shown in FIG.
And a subject (not shown) placed on the bed 1
And a main body (gantry) 4 for irradiating rays from multiple directions to obtain X-ray projection data.

The bed 1 is provided with an X-ray C as shown in FIG.
The table main body 2 is fixed to the floor of the T-scanner room, and the top plate 3 is arranged on the table main body 2. Inside the table main body 2, the top plate 3 is provided. 2, a top plate drive mechanism (not shown) for horizontally moving in the front-rear direction is provided.

On the other hand, the main body 4 is, as shown in FIG.
A body cover 6 having an object insertion hole 5 in the center of the front surface, a fixed base 7 fixed to the bottom surface of the body cover 6, and a ring rotatably supported by the fixed base 7 via a plurality of rollers 8. -Shaped rotation frame 9 and X attached to the front of this rotation frame 9
The X-ray detector 10 is mounted on the front surface of the rotation frame 9 so as to face the X-ray tube 10, and the X-ray detector 11 is provided on the front side portion of the main body cover 6. An opening 14 (see FIG. 3) is provided for forming an access space for the subject inserted into the patient 5.

The rotation frame 9 is
A rotation frame drive mechanism (not shown) rotates in a vertical plane about the subject insertion hole 5. The X-ray detector 11 has a large number of X-ray detection elements arranged in the circumferential direction and the depth direction of the subject insertion hole 5 in order to obtain fluoroscopic image data and multi-slice CT images (or volume data). Is configured. Alternatively, the X-ray detector 11 is composed of a two-dimensional detector or a multi-slice detector.

As shown in FIG. 3, the opening 14 is open from the side surface of the main body cover 6 to the side of the subject insertion hole 5, and is closed by a cover member 15. The cover member 15 is slidably supported by an upper guide 16a and a lower guide 16b (see FIG. 2) provided on the inner surface of the body cover 6, and is slidable in the front-back direction of the body cover 6. .

Further, the main body 4 is, as shown in FIG.
A high voltage generator 12 for applying a high voltage to the X-ray tube 10,
The heat exchangers 13a and 13b for cooling the X-ray tube 10 are provided, and the high voltage generator 12 and the heat exchanger 1 are provided.
3a and 13b are attached avoiding one location of the rotation frame 9 so as not to hinder the sliding operation of the cover member 15.

The rotation frame 9 is provided with weights 17a and 17b for maintaining a stable balance when the rotation frame 9 rotates. However, the weights 17a and 17b may be replaced with other units. Further, a fixed frame 18 is provided on the back side of the rotation frame 9, and a fixed frame 19 and the rotation frame 9 are slidably contacted with a brush 19 provided on the back side of the rotation frame 9 on the front side of the fixed frame 18. A slip ring 20 is provided for exchanging signals between them. An operation panel 21 (see FIG. 1) is provided on the front surface of the body cover 6.
The operation panel 21 is provided with a selection switch as selection means for selecting the CT mode and the fluoroscopic mode.

FIG. 5 shows an X-ray C according to an embodiment of the present invention.
1 shows a schematic configuration of a T scanner. In the figure, 2
Reference numeral 2 denotes an A / D conversion unit that converts a signal output from each detection element of the X-ray detector 11 into a digital signal. The signal output from this A / D conversion unit 22 is X-ray fluoroscopic image data. Is supplied to the first CRT 24 through the first display controller 23 as
The line projection data is stored in the magnetic disk 26 via the buffer memory 25 and further supplied to the reconstruction device 28 via the buffer memory 25 and the preprocessing device 27.

The reconstructing device 28 reconstructs the X-ray data preprocessed by the preprocessing device 27 into image data, and the signal output from the reconstructing device 28 is X
It is supplied to the image processing device 29 as line slice image data.

The image processing device 29 is a reconstruction device 28.
An image signal is generated from the data reconstructed by the above, and the signal output from the image processing device 29 is the second signal.
The second CRT 31 via the display controller 30
It is supplied to.

Further, 32 is a gantry controller for controlling a rotation frame driving mechanism (not shown) for rotationally driving the rotation frame 9, and 33 is an X for controlling the voltage applied from the high voltage generator 12 to the X-ray tube 10. A line controller, 34 is a data acquisition controller for controlling the A / D conversion unit 22 and the preprocessing device 27, and 35.
Is a system controller that controls the entire apparatus. The system controller 35 includes the operation panel 21.
An operation controller 36 that sends a signal from the system controller 35 to the system controller 35 is connected.

In such a structure, when a CT mode signal is input from the operation controller 36 to the system controller 35, a top plate drive mechanism (not shown) is driven. As a result, the top plate 3 of the bed 1 horizontally moves to the main body 4 side, and the subject placed on the top plate 3 is carried into the subject insertion hole 5 of the main body cover 6.

When the top plate 3 of the bed 1 is horizontally moved to the main body 4 side, the rotation frame 9 is inserted into the subject insertion hole 5
The X-ray is emitted from the X-ray tube 10 attached to the rotation frame 9 while rotating at a predetermined speed in a vertical plane centering on the X axis, and the X-ray is emitted to the subject carried into the subject insertion hole 5. Exposed.

At this time, the X-ray detection signal output from the X-ray detector 11 is converted into a digital signal by the A / D conversion unit 22, and then stored in the magnetic disk 26 through the buffer memory 25. Buffer memory 25,
It is supplied to the second display controller 30 via the preprocessing device 27 and the reconstruction device 28, and is displayed on the second CRT 31 as an X-ray slice image. The X-ray detector 1
Since 1 is a two-dimensional detector or a multi-slice detector, it is possible to simultaneously obtain volume data or CT images of a plurality of slices.

At this time, the voltage application condition to the X-ray tube 10 is controlled to 120 kV 300 mA, for example. On the other hand, from the operation controller 36 to the system controller 3
When a perspective mode signal is input to 5, a top driving mechanism (not shown) is driven. As a result, the top plate 3 of the bed 1 horizontally moves to the main body 4 side, and the subject placed on the top plate 3 is carried into the subject insertion hole 5 of the main body cover 6. When the subject placed on the top plate 3 is carried into the subject insertion hole 5 of the main body cover 6, X-rays are emitted from the X-ray tube 10 attached to the rotation frame 9, and the subject is examined. The subject carried in the insertion hole 5 is exposed to X-rays.

At this time, the rotation frame 9 does not rotate, and the position shown in FIG. 2, that is, the X-ray tube 10 is positioned directly above the subject (or the X-ray tube 10 is positioned directly below the subject). It has been stopped). Then, the X-ray detection signal output from the X-ray detector 11 in the fluoroscopic mode is converted into a digital signal by the A / D conversion unit 22, and then sent to the first display controller 23 to detect the X-ray. It is displayed on the second CRT 24 as a fluoroscopic image. The voltage application condition to the X-ray tube 10 in the fluoroscopy mode is controlled to a low dose of 80 kV 4 mA, for example.

Further, when the cover member 15 is slid to the rear of the main body cover 6 in the above-mentioned perspective mode, as shown in FIG. 4, the access space 37 for the subject inserted into the subject insertion hole 5 becomes the main body cover. 6 is formed on the front side portion.

Therefore, a percutaneous biopsy is performed through the access space 37 formed on the front side of the main body cover 6 so that the main body cover 6 is inserted into the subject insertion hole 5 without disturbing it. A percutaneous biopsy can be performed on the subject from the outside of the main body cover 6. If the rotation frame 9 is not in the position shown in FIG. 2, the rotation frame 9 is rotated by the input of the perspective mode signal, and when the rotation frame 9 reaches the position shown in FIG. To be done. Therefore, the slide space of the cover 15 is automatically secured only by inputting the perspective mode.

Further, in the embodiment of the present invention, since the high voltage generator 12 and the heat exchangers 13a and 13b are attached to one side of the rotation frame 9 in a biased manner, the cover member 15 is provided behind the main body cover 6. It can be slid greatly, and a deep access space 37 can be formed on the front side of the body cover 6.

In one embodiment of the present invention, a large number of X
Fluoroscopic image data is obtained by using the X-ray detector 11 in which the X-ray detection elements are arranged in the circumferential direction and the depth direction of the subject insertion hole 5, but the number of X-ray detectors 11 is small (narrow width). When the X-ray detection elements of No. 1 are arranged in the circumferential direction and the depth direction of the subject insertion hole 5, wide perspective image data can be obtained by using the tabletop movement of the bed 1 together. .

Further, in one embodiment of the present invention, means for taking out the output signal of the X-ray detector 11 to the outside or transmitting the high voltage generator 12 is provided with a brush 19 provided on the rear surface of the rotation frame 9. Fixed frame 19
However, the signal transmission may use optical transmission instead of slip ring.

[0031]

As described above, according to the present invention, it is possible to provide the X-ray CT scanner which can secure a wide access space for the subject inserted into the subject insertion hole.

[Brief description of drawings]

FIG. 1 is a perspective view showing a bed and a main body of an X-ray CT scanner according to an embodiment of the present invention.

FIG. 2 is a diagram showing an internal structure of a main body of the scanner.

FIG. 3 is a sectional view taken along the line AA of FIG. 2;

FIG. 4 is an operation explanatory view of the scanner.

FIG. 5 is a diagram showing a schematic configuration of an X-ray CT scanner according to the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Bed 4 ... Main body 5 ... Subject insertion hole 6 ... Main body cover 9 ... Rotation frame 10 ... X-ray tube 11 ... X-ray detector 14 ... Opening 15 ... Cover member

Claims (4)

[Claims] 1. A main body cover having a subject insertion hole in the center of the front surface, a rotation frame provided in the main body cover and rotating in a vertical plane about the subject insertion hole, and attached to the rotation frame. X for irradiating the subject inserted in the subject insertion hole with X-rays
An X-ray CT scanner comprising a X-ray tube and an X-ray detector attached to the rotation frame so as to face the X-ray tube and detect X-rays transmitted through the subject. An opening is provided on a side portion of the main body cover from a side surface of the main body cover to a side portion of the subject insertion hole, and a cover member for closing the opening is slidably provided on the rear side of the main body cover. Line CT
Scanner. 2. The high voltage generating means for applying a high voltage to the X-ray tube, and the X-axis on the rotation frame.
The X-ray CT scanner according to claim 1, wherein a heat exchanger for cooling the wire tube is attached to one side of the rotation frame in a biased manner. 3. A CT for detecting a X-ray emitted from an X-ray source rotating around a subject by an X-ray detector and reconstructing a tomographic image based on transmission data collected from each direction. A mode, a fluoroscopic mode for generating a fluoroscopic image based on transmission data of X-rays emitted from an X-ray source stationary at a predetermined position, selection means for selecting one of these CT mode and fluoroscopic mode, and this selection An X-ray CT scanner, comprising: a gantry control unit that controls the X-ray source to be positioned at a predetermined position and stopped when the fluoroscopic mode is selected by the unit. 4. The X-ray CT scanner according to claim 1, wherein the X-ray detector is a two-dimensional detector or a multi-slice detector.