JPS61209640A - Scanning apparatus of 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 [Field of Application of the Invention] The present invention relates to a scanning device in a device for performing computed tomography such as an XtlACT device or a positron CT device, and more specifically relates to a gantry in these scanning devices. This relates to improvements to the mechanism that tilts the front and back.

[Background of the invention]

Among these scanning devices, as well as the scanning devices of NMR-CT devices, those capable of diagnosing the whole body have a gun 1 equipped with a detector, etc., supported by a base so that it can be tilted back and forth. It is common to obtain a cross-sectional image oblique to the patient's body axis.

These scanning devices have the versatility of being able to perform CT imaging of not only the patient's body but also the head.

However, since the device is large and bulky, a fairly large scanner room is required for installation. For this reason, in hospitals with limited space, such as the small hospital 2, the introduction of the system involves remodeling the hospital, which requires a large amount of cost, and the current situation is that it is not possible to install the system even if there is a need for it.

[Purpose of the invention]

The present invention provides a more compact scanning device for this type of CT apparatus.

[Summary of the invention]

The present invention allows the slope of the gantry to hold shafts extending horizontally from both sides of the gantry in bearings in the base;
This is done by rotating the gantry with a power cylinder on the base, and the total +1. There are quite a lot of +, and therefore a large scanner room is required for installation, whereas many scanner rooms are rectangular,
Focusing on the fact that it can be installed by reducing only one dimension, only the total length of the scanning device was reduced, and the entire device was configured to be compact.

More specifically, the scanning device of the present invention has a mechanism for supporting the gantry on the base, which includes a ball member and a ball seat member, and the ball member is arranged such that the ball member can rotate only in a vertical plane when tilting. The spherical seat member is comprised of a ball joint connected to the gantry and the base. For this purpose, for example, the base is located on the bottom surface of the gantry, the ball joint is placed between the bottom surface of the gantry and the top surface of the base, and each member constituting the ball joint is connected to the gantry and the base. , the device gold mine can be made approximately equal to the gantry IJ.

Embodiments of the scanning device of the invention are described below in conjunction with the accompanying drawings.

[Embodiments of the invention]

This scanning device is for an X-ray CT device, and its gun 1 is equipped with an X-ray source 1, an X-ray detector 2, and a rotating frame 3. The X-ray source is equipped with an X-ray tube and an x, 6-bundle aperture mechanism, and can emit fan beam X-rays.

The X-ray detector is in the form of an ionization chamber and has a large number of detection elements. The X-ray source and the X-ray detector are supported by arms 4 and 5 extending from the rotating frame 3, facing each other, so that the detection elements of the X-ray detector are aligned along the spread of the fan beam X-rays. ing. The rotating frame is a hollow cylindrical member that is held in bearings on the main frame 6 and can rotate about an axis 7 on the main frame 2. The rotating frame is rotated by an electric motor 9 in the main frame 6 rotating a pulley 11 via a speed reducer 10.
The bell 1 to 8 is made by rotating a pulley formed at the end of the rotating frame=3-3.

The gantry is supported on a base 15 so as to be able to rotate back and forth about a horizontal axis, for example through an angle of 30 degrees about a vertical plane, and is pivoted about the patient's body axis. This makes it possible to perform CT imaging not only of a cross section perpendicular to the body axis, but also of a cross section inclined at an angle corresponding to the inclination angle of the gantry with respect to the body axis. explain in detail.

The main frame 6 has side walls located at right angles from the front wall that holds the rotating frame. Each of the side walls has a sloped lower surface, and the base 15 is arranged so as to enter the space formed by these slopes. A ball joint is disposed between the portion of the frame that extends to the top surface of the base I5 and the top surface of the base 15.

The ball joint itself comprises a ball member 14 and a ball seat 16.

The ball seat member is fixed to the upper surface of the base, and the ball member is coupled to a shaft 12 fixed to the lower surface of the side wall of the main frame, so that the gantry can rotate about this ball joint. be. Of course, the line connecting the rotation centers of the ball joints intersects at right angles to the rotation center axis of the rotating frame 3, and is positioned within the fan beam X-ray.

Such a support structure includes the side walls of the main frame 3 and the base 1.
5 are located approximately in the same plane together with the ball joint, so that the entire device 11 can be approximately equal to the width of the gantry. Since the base 15 is arranged so as to fit into the space formed by the slopes of the lower surfaces of both side walls of the main frame 6, the overall height of the device does not increase.

The gantry is rotated by a power cylinder 17. The power cylinder has a rond and a case mounted on shafts supported by brackets on the rotating frame 3 and the main frame I5, respectively. The power cylinder itself has, for example, a screw shaft and an electric motor guided in a case so as to be able to move only in a straight line, and when the electric motor rotates the screw shaft, the rond can be moved in a straight line. Note that the power cylinder is placed between the bases 15 to prevent the size of the device from becoming too large.

The gun can be tilted at any angle with the ball joint as the center by extending the rond of the power cylinder 17. That is, when the rond of the power cylinder 17 is extended, the gantry is moved, the ball member I4 is rotated together with the gantry only in the vertical plane at the ball seat member I6, and the power cylinder is stopped. , the gantry can be stopped at a predetermined angle. Therefore, the patient is placed with his or her body axis aligned with the central axis of rotation of the rotating frame 3 and the area to be examined aligned with the fan beam X-rays, and the rotating frame 3 is rotated by the electric motor 9 and X-rays are emitted at the same time. By
It is obtained in each detection element of the line detector 2. Also, when installing the device, the width of the gantry is approximately equal to 1] of the gantry, and the width of the gantry is the size that allows the X-ray source 1 and X-ray detector 2 to rotate, that is, the width of the rotation radius R shown in FIG. Since it only needs to be slightly larger than twice the size, the installation location is less restricted than with conventional devices.

〔Effect of the invention〕

As described above, in the scanning device of the present invention, the gantry is supported by a ball joint on the base, and the ball member can be rotated only in a vertical plane, thereby reducing the size of the device and making it possible to Since it is a self-contained system, there are no restrictions on where it can be installed.

[Brief explanation of drawings]

The drawing shows an embodiment of the scanning device of the present invention.
The figure is a front view, and FIG. 2 is a side view. 3...Rotating frame, 6...Supporting frame, 14.
... Ball member, 15... Base, 16... Ball seat member,
17...Power cylinder.

Claims (1)

[Claims] a gantry, a base, a support mechanism for supporting the gantry so that the gantry tilts back and forth about a horizontal axis, and a drive mechanism disposed between the gantry and the base for causing the gantry to make the tilt. The support mechanism has a ball member and a ball seat member, and the ball member and the ball seat member are connected to the gantry and the base so that the ball member can rotate only in a vertical plane during the tilting. A scanning device for a CT apparatus characterized by comprising a ball joint.