JPS63264045A - X-ray ct 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 [Object of the Invention] (Industrial Application Field) The present invention relates to an X-ray CT apparatus that performs X-ray photography of a subject.

(Prior Art) Conventionally, in third generation or later generation X-ray CT apparatuses, a scanogram of a subject is taken in advance in order to determine a scan position.

In other words, the X-ray tube and X-ray detector in the X-ray CT apparatus are fixed at fixed positions, and the bed on which the subject is placed is moved between the X-ray tube and the X-ray detector. At the same time, X-rays are irradiated toward the subject in synchronization with the movement of the bed, and the X-rays are
Obtain a scanogram that is almost the same as a line perspective image. A scanogram and a plurality of equally spaced horizontal lines indicating the positions of tomographic regions are simultaneously displayed on the CRT display of the X-ray CT apparatus. After the operator views the scanogram and identifies the area to be tomographically scanned, the operator inputs the number corresponding to the corresponding horizontal line on the CRT display into the X-ray tomography device via the keyboard. The top of the bed is moved so that the subject's tomographic region is located at
Next, tomography is performed by rotating the X-ray tube.

However, the CRT display and operation console are usually located at the console, and the X-ray CT scanner and bed are
It is located in the shooting room adjacent to the console, so
Scan positioning using a scanogram must be set remotely, and there is a risk of interference with the subject due to tilting of the gantry, movement of the bed top, etc.

Further, scan positioning may be performed manually by an operator. This positioning is performed by an operator near the bed on which the subject is placed, controlling the movement of the bed top while checking the position of light irradiation from the projector.

However, in this manual setting, the operator has no choice but to grasp the position of the subject's internal organs and the like by palpation from the outside, so it is not always possible to perform accurate positioning.

(Problems to be Solved by the Invention) As described above, scan positioning using a scanogram has the problem of interference with the object, and scan positioning using manual operations by an operator has a problem with positioning accuracy.

SUMMARY OF THE INVENTION It is an object of the present invention to eliminate the above-mentioned drawbacks, and to provide an X-ray CT apparatus that can safely and accurately perform scan positioning during X-ray imaging of a subject.

[Structure of the Invention] (Means for Solving the Problems) The present invention provides an X-ray C method that sets a scan position for a subject placed on a top plate of a bed and performs X-ray photography at the scan position.
The T device is characterized in that a display means for displaying an image for scan positioning is provided near the top plate.

(Function) The operator can perform scanning positioning near the bed while looking at the display contents of the display means, and thereby,
Positioning in X-ray photography can be performed safely and accurately.

(Example) Hereinafter, the present invention will be specifically explained with reference to Examples.

Ru.

FIG. 1(a) is an external perspective view of an apparatus according to an embodiment of the present invention.

As shown in the figure, the apparatus of this embodiment includes a pedestal 1 having an imaging hole 6, and a bed 3 from which a subject (not shown) can enter and exit the gantry imaging hole 6.

Floodlights 7, 8.9 for scanning positioning are provided above and on both sides of the entrance and exit of the gantry photographing hole 6. An X-ray tube and an X-ray detector are placed inside the pedestal 1.
These are hidden from view from the outside by a cover material forming the inner wall surface of the gantry photographing hole 6.

The bed 3 is designed to move up and down in the four directions of arrows.
In addition, a top plate 2 that moves in the direction of arrow 5 is provided. A subject is placed on this top plate 2.

Further, an operation panel 10 is provided near the top plate 2 of the bed 3.

FIG. 1(b) shows details of this operation panel 10. As shown in the figure, this operation panel 10 includes a display means 11 for displaying image information for scan positioning, a search key, and a window key.

A first operation key group 12 including an ROI (region of interest) movement key, an ROI rotation key, etc., and a top plate movement key.

A second operation key group 13 including a tilt key, a floodlight key, etc.
and has. The display means 11 is a CRT display, a liquid crystal display, or the like. The scan positioning image information includes a scanogram 16 of the subject and a first image superimposed on the scanogram 16. and second lines RO114 and RO15.

The first line ROI 14 represents the scan plane of the object;
The second line RO115 represents the projector plane. This first. The second lines ROI'14 and 15 are configured to move according to the tilt of the gantry and the movement of the bed top.

FIG. 2 is a block diagram of the main parts of the apparatus of this embodiment. X
The object transmission information of the X-rays irradiated from the ray tube 16 is detected by the X-ray detector 17, and this detection output is sent to a data acquisition section comprising an integrating circuit, a sample hold circuit, and an A/D conversion circuit. (DAS: Data Acousi
tion system) 18 to the reconfiguration unit 19
The image is then captured into the camera and used for image reconstruction. The scanogram formed by scanning the scanogram is transferred from the reconstruction unit 19 to the image memory 21 and written therein. The scano image in the image memory 21 is sent to the D/A converter 23 via an adder 22 arranged at a later stage, where it is converted into an analog signal and then sent to the display means 11. ing.

On the other hand, the first. Various operation command signals from the second operation key group 12, 13 are taken into the control section 26. The control unit 26 controls the movement of the top plate of the bed 3 and the tilting of the gantry based on the operation command signal, and also controls the operation of the image memory 21 and the graphic memory 25. ). Further, movement signals related to movement of the top plate and tilting of the pedestal are inputted to the graphic memory 25, and graphic information in the graphic memory 25 is read out in accordance with this movement signal, and this is read out by the adder 22. It will be added to the scanogram. The graphic information includes characters, graphs, etc., and the first and second lines ROX are also formed by this graphic information. Note that the image memory 21. Adder 22, D/A converter 23. Graphic memory 25
The control unit 26 and the like are arranged on the layer side of the operation panel 10.

In the above configuration, first, a scanogram of the subject on the bed top 2 is taken. This scanogram photographing is performed by fixing the X-ray tube 16 and the X-ray detector 17 in a fixed position and moving the bed top 2, as in the conventional case, and the scanogram obtained by this photographing is Image memory 21.
Display means 11 via adder 22 and D/A converter 23
will be displayed.

In addition, scano image search and window processing.

The execution of arithmetic processing related to ROI setting can be appropriately instructed by the first operation key group 12.

The operator then moves the bed top 2 or tilts the pedestal 1 as necessary by operating the second operation key group 13. The movement of the bed top 2 and the tilt information of the pedestal 1 are captured in the graphic memory 25,
Graphic information corresponding to this information, especially the first one. The second line ROI information is displayed on the display means 11 via the adder 22 and the D/A converter 23. In other words, the first . Second line RO1
14 and 15 move on the scanogram 16. The operator sets a desired scanning position while viewing the displayed content on the display means 11. In such scan position setting, since the operator is in the vicinity of the bed 1, there is no risk of interference with the subject due to tilting of the gantry, movement of the bed top, etc.; This enables accurate scan positioning.

Incidentally, since the tomography of the subject is the same as the conventional method, the explanation thereof will be omitted.

Although one embodiment of the present invention has been described above, it goes without saying that the present invention is not limited to the above embodiment and can be implemented in various modifications.

For example, in the above embodiment, the display means 11 is provided on the bed 3, but the display means 11 may be installed at any location that is easy for the operator to see, and it is possible to attach the display means 11 to any of the 9 locations near the bed top 2. . For example, they may be arranged in parallel to the bed 3.

[Effects of the Invention] As described in detail above, according to the present invention, it is possible to provide an X-ray CT apparatus that can safely and accurately perform scan positioning during X-ray imaging of a subject.

[Brief explanation of the drawing]

FIG. 1(a) is an external perspective view of the main parts of a device according to an embodiment of the present invention, FIG. 1(b) is a detailed explanatory diagram of the display means in FIG. 1(a), and FIG. A block diagram showing the main parts of the system is required. DESCRIPTION OF SYMBOLS 1... Frame, 2... Top plate, 3... Bed, 10 Operation panel, 11... Display means.

Claims (2)

[Claims] (1) In an X-ray CT apparatus that sets a scan position for a subject placed on the top of a bed and performs X-ray photography at the scan position, a display means for displaying an image for scan positioning is set on the top of the bed. X-ray C characterized by being provided near the plate
T device. (2) The X-ray CT apparatus according to claim 1, wherein the display means is mounted on a bed.