JPH03178643A - X-ray ct device - Google Patents

Abstract

PURPOSE:To reduce the deformation and the vibration of a main frame part of a rack base, to obtain exact image information, and to improve the image quality of a display image by constituting a device so that the turning part of the other end part of the main frame part is supported against a stand part through a buffering means. CONSTITUTION:A main frame part 3 is stable since it is supported by the four parts of supporting points A, B, a diagonal driving supporting part C and a damper supporting part D, and also, since a shock which an arm part 3b receives is absorbed by a damper 8, the deformation and the vibration of the main frame part 3 generated at the time of scan operation and at the time of actuation and the shut-off of a diagonal driving means 7 are reduced. Accordingly, the fluctuation of the scan center displacement in the course of scan is reduced, and exact image information by high resolution and high image formation degree can be obtained, therefore, the image quality of a display image is improved. Also, since the main frame part 3 is stable, the difference of a CT image caused by the scan of CW/CCW rotations can be reduced.

Description

Detailed Description of the Invention [Objective of the Invention] (Industrial Application Field) The present invention relates to an X-ray CT apparatus for obtaining a tomographic image (CT image) of a subject using X-rays, and particularly relates to an The present invention relates to an X-ray CT device that can reduce vibration.

(Prior Art) Conventionally, as this type of X-ray CT apparatus, there is one shown in FIG. 3, for example. FIG. 3 is a perspective view showing the scanner section of the X-ray CT apparatus. In the figure, when the upper part of the bed 102 on which the subject 101 is placed moves in the direction a in the direction of the arrow in the figure, the subject 101 is placed in the imaging hole 103 of the pedestal 103.
inserted into a. Inside the frame 103, there is an X-ray irradiation system 104.
and a detector 105 are arranged facing each other, and the X-ray irradiation system 10
4 and the detector 105 are rotated around the subject 101, the subject 101 is irradiated with X-rays, and the subject 101 is photographed.

Then, the image information obtained by the detector 105 is sent to the image 1'Jl tl section (not shown), and CT@! is configured and displayed.

Further, when obtaining a tomographic image oblique to the body axis direction of the subject 101, the gantry 103 is tilted in the direction indicated by the arrow in the figure (hereinafter referred to as oblique entry operation) to perform imaging.

As shown in FIG. 4, the pedestal 103 is either a main frame part 106 in which the X-ray irradiation system 104 and the detector 105 are rotatably provided via a rotating member, or a stand part 107 fixedly arranged on the floor. It is supported so that it can be tilted against.

Both end portions 108 and 109 of the main frame portion 106 in the lateral direction (in the direction of arrow C in the figure) are rotatable at fulcrums A and B, respectively, and are connected to oblique entry operation shafts 110 . Bearing 111
It is attached to the stand section 107 via.

Further, the end portion 109 is supported by a driving means 112 in the oblique entry drive support section C, and during the oblique entry operation, the drive means 112 drives the oblique entry drive support section C to move it up and down in the direction of arrow d in the figure. As a result, the end portion 109 rotates about the fulcrum B in the direction of the arrow e in the figure, thereby tilting the pedestal 103 in the direction in which it loses its mark.

(Problem to be Solved by the Invention) However, in the case of the above-mentioned prior art, the main frame part 106 is unstable because it is supported at three places, the fulcrums A and B, and the oblique drive support part C, and the scanning X of time
Raysho Q1 series 104. F! of the rotating part including the detector 105! In response to shaking, the portion of the main frame portion 106 on the side opposite to the oblique drive support portion C is likely to shake and deform in the direction of the arrow f in FIG. 4. Further, when the drive means 112 is started or stopped during the oblique insertion operation, the main frame portion 106 receives a large impact and is likely to generate vibrations.

If such deformation or vibration of the main frame section 106 occurs during imaging, the scan center displacement during scanning will fluctuate, that is, the X-ray irradiation system 104. The relative positional relationship between the rotating part including the detector 105 and the subject 101 changes, and the image information obtained by the detector 105 becomes inaccurate. As a result, the quality of the displayed image deteriorates, and the main frame section 1
06 is unstable, there is a problem in that a large difference tends to occur in CT@ between scans of cw and ccw rotations.

The present invention has been made to solve the problems of the prior art described above, and its purpose is to reduce the deformation and vibration of the main frame of the mount, obtain accurate image information, and display it in one display. (X-ray C that can improve the image quality of elephants)
The objective is to provide a T device.

[Structure of the Invention] (Means for Solving the Problems) In order to achieve the above object, in the present invention, the main frame section on which the X-ray irradiation system and the detector are rotatably provided is a stationary system. In an X-ray CT apparatus including a pedestal that is tiltably supported with respect to a fixedly arranged stand part, the main frame part is rotatably supported on the stand part at a pair of fulcrums whose ends in the lateral direction are opposite to each other. A rotating part attached to the main frame part and rotating around a fulcrum at one end is supported by an oblique drive means for rotating the rotating part around the fulcrum and tilting the main frame part. In addition, the rotating portion at the other end of the main frame portion is supported by the stand portion via a buffer means.

(Function) In the device of the present invention having the above configuration, the main frame portion has two fulcrums at both ends, a support portion supported by the diagonal drive means, and a support portion supported via the buffer means.
Since it is supported at several points, it is stable, and the impact received by the main frame when the diagonal drive means is retracted during scanning operations or when the diagonal drive means is started or stopped is absorbed by the shock absorbing means. , deformation and vibration occurring in the main frame are reduced.

Therefore, fluctuations in scan center displacement during scanning are reduced, and accurate image information can be obtained.

Furthermore, since the main frame portion is stabilized, the difference in CT images due to scanning of CWCCW rotation is reduced.

(Example) Examples of the present invention will be described below with reference to the drawings. FIG. 1 is an explanatory diagram showing the configuration of a frame of an X-ray CT apparatus according to an embodiment of the present invention. In the figure, the pedestal 1 has a main frame part 3 supported by a stand part 2 fixedly arranged on the floor as a generally stationary system, and the stand part 2 and the main frame part 3 are placed inside a cover member 4 having a substantially rectangular parallelepiped shape. It is stored.

This pedestal 1 is provided with an imaging hole 1a into which the central portion is inserted, and the subject is moved in the direction of arrow a in the figure and placed in the imaging hole 1a.
inserted into a.

The stand part 2 consists of a base part 2a arranged parallel to the floor surface, and side parts 2b and 2C erected at the ends of the base part 2a in the lateral direction of the pedestal (direction C in the figure). 2b and 2C are provided perpendicularly to the floor surface.

The main frame section 3 includes a plate-shaped frame section 3a and arm sections 3b, 3 attached to both side surfaces of the frame section 3a.
The longitudinal direction of the arm portions 3b and 3C is substantially perpendicular to the plane direction perpendicular to the side surface of the frame portion 3a. The main frame section 3 is connected to the stand section 2.
4 of the support parts A, B, the oblique drive support part C, and the damper support part p. The main frame part 3 is supported by a force point.
The pedestal 1 is arranged so that a plane perpendicular to the side surface thereof is parallel to the lateral direction of the pedestal 1. Support parts A and B are arm parts 3b, respectively.
, 3c are provided on the lower surface of the front side (subject insertion side), and the arm portions 3b and 3c are connected to the side surface portion 2 of the stand portion by oblique movement shafts 6 via bearings 5 in the support portions A and B, respectively.
It is rotatably supported with respect to b and 2c.

The oblique drive support section C is provided on the lower surface of the rear side of the arm section 3C, and the arm section 3C is supported by the oblique drive means 7 in this oblique drive and dynamic support section C. The diagonal entry drive means 7 is installed on the base portion 2a, and during the diagonal entry operation, the arm portion 3c is rotated in the direction of the arrow e about the fulcrum B by moving the diagonal entry drive support portion C of the arm portion up and down in the direction of the arrow d. This causes the main frame portion 3 to tilt in the direction indicated by the arrow, thereby tilting the pedestal 1.

The damper support portion is provided on the rear lower surface of the arm portion 3b, that is, at a position opposite to the oblique drive support portion C.
The arm portion 3b is supported by the base portion 2a of the stand portion via a damper 8 as a buffer means at this damper support portion.

The damper 8 is a shock absorber that is extendable and retractable using hydraulic pressure, air pressure, etc., and expands and contracts in accordance with the impact received by the arm portion 3b to absorb this impact.

Further, an X-ray irradiation system 9 and a detector 10 are rotatably provided and arranged opposite to the main frame part 3 via a rotating member, and during imaging, the X-ray irradiation system 9 and the detector 10 are arranged opposite each other. The X-ray irradiation system 9 irradiates the subject with X-rays while rotating around the subject inserted into the imaging hole 1a, and the detector 10 detects the X-rays that have passed through the subject.

As shown in FIG. 2, the image information obtained by the detector 10 is sent to the preprocessing unit 10 and subjected to preprocessing such as signal processing, and then the image reconstruction unit 11 reconstructs the image from the image information. A tomographic image is constructed by the configuration calculation, and the CT image is displayed on the display unit 12.

When performing the diagonal insertion operation, as described above, the arm portion 3C is rotated by the diagonal insertion driving means 7 to tilt the main frame portion 3 in the direction indicated by the arrow, thereby tilting the pedestal 1. By performing the above imaging while tilting the gantry 1 in this manner, tomographic images having various angles other than perpendicular to the body axis direction of the subject can be obtained.

In this embodiment, the main frame section 3 has fulcrums A and B.
, the diagonal drive support part C and the damper support part, so it is stable, and the impact received by the arm part 3b is absorbed by the damper 8, so it is not difficult to use during scanning operation or diagonal drive. Deformation and vibration of the main frame portion 3 that occur when the means 7 is started and stopped are reduced. Therefore, fluctuations in scan center displacement during scanning are reduced, and accurate image information can be obtained with high resolution.
The quality of the displayed image can be improved.

In addition, since the main frame part 3 is stable, cw,
Differences in CT images due to scanning with ccw rotation can be reduced.

[Effects of the Invention] The X-ray CT apparatus of the present invention has the above-described configuration and operation, and by supporting the end of the main frame portion on the opposite side from the oblique drive means via the buffer means, scanning operation can be performed. Deformation and vibration of the main frame part that occur when starting and stopping the diagonal drive means are reduced, and high resolution and high resolution (accurate images due to image quality (obtain image information and improve the image quality of displayed images) Furthermore, image differences due to CW and CCW rotations can be reduced.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing the configuration of an X-ray CT device mount according to an embodiment of the present invention, FIG. 2 is a block diagram showing a schematic configuration of the same embodiment, and FIG. 3 is a conventional X-ray CT device. FIG. 4 is an explanatory diagram showing the configuration of the pedestal of the conventional example. 1... Frame 2... Stand part 3.
...Main frame part 5...Bearing 6...Oblique entry operation shaft 7...Oblique entry drive means 8...Damper (
Buffer means) 9... X-ray irradiation system 10... Detector
A, B... Support part C... Oblique drive support part D... Damper support part

Claims (1)

[Scope of claims] In the apparatus, the main frame part is attached to the stand part so that both end parts in the lateral direction can rotate at a pair of supporting points facing each other, and a rotating part that rotates about the supporting point at one end is attached to the stand part. The rotating portion is supported by a diagonal drive means for rotating the rotating portion about a fulcrum to tilt the main frame portion, and the rotating portion at the other end of the main frame portion is connected to the rotating portion via a buffer means. An X-ray CT apparatus characterized by being supported by a stand part.