JPS6274332A - X-ray multi-track tomographic 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] [Technical Field of the Invention] The present invention relates to an X-ray multi-orbit solar shading device equipped with a grid rotation transmission mechanism that rotates a grid in synchronization with the operation of an X-ray tube, and particularly relates to , equipped with a grid rotation transmission mechanism that has high torsional rigidity, is expandable and has a low cost of 1~, and transmits the rotation of the X-ray tube to the grid without phase shift, resulting in a high-quality X51.
The present invention relates to an x5i multi-orbit tomography device capable of obtaining images.

[Technical background of the invention]

The X-ray tomography 11i1 imaging device moves the X-ray tube along a certain trajectory and at the same time moves the X-ray tube at a certain point on the is moved C along a certain trajectory so that the relative velocity between the projection of any white on a certain plane of the subject onto the film surface and the film becomes zero.

Among such X-ray tomographic imaging devices, there are so-called X-ray multi-orbit tomography devices in which the X-ray tube draws multiple orbits. - Straight line 1 in the tena plane
It is common to move the object along a circular, spiral, etc. trajectory.

By the way, in the X-ray dance, the object of the photograph was Mt. Tayu.
In order to allow only the secondary X-rays to reach the film and to prevent the secondary X-rays, which are in a different direction from the primary X-rays, from reaching the film, a grid made of thin metal foils was used. The configuration has been applied. For example, in the case of a circular orbit, a grid rotation transmission mechanism is applied that moves the grid in synchronization with the circular orbit of the X-ray tube.

Figure 4 shows the conventional grid rotation transmission x15 with 1M groove.
A is a schematic diagram of a multi-orbital tomography device, in which an X-ray tube 1 is supported by an arm 2 so as to be able to draw a circular orbit, and a Butsky device 3 arranged opposite to the X-ray tube 1 has a rotatable grid. 4 is provided.

The grid rotation transmission mechanism also includes an X-ray tube-side first shaft 5 and an X-ray tube-side second shaft 6 as a rotation transmission system for the X-ray tube 1, and a grid-side first shaft 7 as a rotation transmission system for the grid 4. , a grid-side second shaft 8, and the X-ray tube-side second shaft 6 and the grid-side second shaft 8 are connected by a flexible wire 9.

[Problems with back clasp technology] In the case of a structural acid, the rotation of the XlI tube 1 is transmitted from the first shaft 5 on the X-ray tube side and the second shaft 6 on the X-ray tube side to the flexible wire 9. 9 can be transmitted to the grid 4 via the grid-side first shaft 7 and the grid-side second shaft 8.

However, since the X-ray tube rotation transmission system and the grid rotation transmission system are configured to transmit rotation using the flexible wire 9 with low torsional rigidity, it is impossible to transmit the rotation of the X-ray tube 1 without phase shift. Have difficulty. In this case, if a phase shift occurs, it will lead to poor image quality due to insufficient dose, and good X-ray diagnosis will not be possible. Although it is conceivable to use a spline shaft instead of the flexible wire 9 as a method that does not cause a phase shift, this increases the cost and is not practical, which is a problem when applied to this type of mechanism.

[Purpose of the invention]

The present invention has been made based on the above-mentioned circumstances, and its purpose is to provide a grid rotation transmission mechanism with high torsional rigidity, telescoping, and low cost, and to prevent phase shifts and provide high-quality X-ray images. The object of the present invention is to provide a multi-track cutting 111&i shadow device.

[Summary of the invention]

In order to achieve such an object, the present invention provides an X-ray multi-orbit tomographic imaging apparatus equipped with a grid rotation transmission mechanism that rotates a grid in synchronization with the movement of an X-ray tube, in which the grid rotation transmission mechanism comprises: , a hollow cylinder having one end connected to move in synchronization with the X-ray tube and having a pair of axially opposed grooves formed therein, and one end connected to move the grid in rotation, It! ! A shaft whose end is inserted into the other end of the hollow cylinder, and a pin formed by being hung in the pair of grooves at right angles to the shaft to prevent mutual rotation between the shaft and the hollow cylinder. It is characterized by the following:

[Embodiments of the invention]

An example of an X-ray multi-orbit tomography apparatus according to the present invention will be described below with reference to the drawings. Figures 1(a) and 1(b) show the X-ray multi-orbit tomography apparatus of this embodiment.
> is a front view, and FIG. 1(b) is a side view.

In FIG. 1, reference numerals 11 and 12 are stands fixed to the floor, and the stand 11 includes an X-direction guide that guides the movement of a butt key device (18) and a movable case (15), which will be described later, in the X direction shown in the figure. A rail 13 is provided, and one end side of a movable housing 15 that moves in the X direction in the drawing is supported by the X-direction guide rail 13 via a bearing 14. The pedestal 12 has a substantially "" shape, and an X-direction guide rail 13 is provided in the middle thereof to guide the movement of the butt key device f (18) and the movable cylinder 15 in the X direction shown in the figure, which will be described later. The other end of a movable body 15 that moves in the X direction in the figure is supported by the guide rail 13 via a bearing 14.

On both sides of the movable housing 15 there are butkey devices (18) which will be described later.
An X-direction guide rail 16 is provided for guiding movement in the y-direction in the figure on the moving housing 15.
A main unit 18 with a film storage is supported and provided.

Furthermore, a grid 20 is provided on the upper part of the Butzuki device 18, and is rotatably supported at one rotational center point and rotates in the direction of the arrow shown in the figure.A gear is formed on the circumference of this grid 20.
A chain 22 is passed between this gear and a separately installed gear 21 so that the rotation of the gear 21 is transmitted to the grid 20.

This gear 21 is a grid rotation transmission mechanism 2 which is a main part of this embodiment for interlocking movement with X-ray tubes (two) to be described later.
3 are rotatably connected.

Further, one end of a connecting arm 24 constituted by a link mechanism is engaged with the butkey device 18, and the intermediate portion of this connecting arm 24 is semi-fixed at a mounting surface setting portion 25 in the intermediate portion of the pedestal 12. The center of rotation is set, and the other ends are marked with X, which will be described later.
The X-ray tube (29) is connected to rotate in a conical shape as a whole, and the rotation of the X-ray tube (29) is transmitted to the Butsky device 18.

On the other hand, a gear 26 is provided at the top of the pedestal 12, which is rotated by a motor (not shown) as shown by the arrow in the drawing, and a gear 28 is provided which is rotated by a chain 27 that is hooked to the gear 26. is connected to the other end of the grid rotation transmission mechanism 23.

Further, a rotating body 28 is provided at the lower end of the shaft of the gear 26, and an X51 tube 29 is provided on this rotating body 28 so as to be movable in two directions shown in the figure, and a connecting arm is provided in order to move in conjunction with the movement. The other end of 23 is connected.

With the above configuration, the two X11 tubes are rotated in a predetermined manner via the gear 26 which is rotationally driven by a motor (not shown), and the rotation is controlled by the connecting arm 24 to the Butsky device 1.
8, and a composite motion in the X direction and the y direction is realized. At this time, the rotation of the gear 26 is caused by the chain 27 and the gear 2.
8 to the transmission l1123, and drives the grid 20 to rotate about one rotational center point.

The above is an overview of the operation of the device of this embodiment.
The grid rotation transmission mechanism 23, which is the main part of this embodiment, will be explained with reference to the drawings. FIGS. 2(a) and 2(b) show the main part of the grid rotation transmission fit 123 in this embodiment, that is, the configuration of the transmission structure a that connects the XFil tube rotation transmission system and the grid rotation transmission system. FIG. 2(b) is a perspective view showing the state when it is extended.

In the transmission mechanism 23 shown in FIG. 2, 40 is a hollow cylinder whose one end is connected to move in synchronization with the X-ray tube, and in which a pair of cylinders 40at and 40a2 are formed facing each other in the axial direction. A shaft connected to rotate the grid, the other end of which is inserted into the other end of the hollow cylinder 40, and 42 is a shaft that is connected at right angles to the shaft 41 to prevent mutual rotation between the shaft 41 and the hollow cylinder 40. groove 40a+
.

40a2, and this configuration allows the shaft 41 to move telescopically on the hollow cylinder 40 as shown in FIGS. 2(a) and 2(b).

Next, the operation of the above configuration will be explained with reference to FIG. FIG. 3 is a schematic diagram showing an X-ray multi-orbit tomography apparatus using the transmission mechanism 23 of FIG. 2, in which the same parts as in FIG. 4 are given the same reference numerals.

As shown in FIG. 3, the rotation of the X-ray tube 1 is transmitted from the seventh shaft 5 and the second shaft 6 on the XFIJ tube side to the transmission mechanism 23 of this embodiment, and Rotate the cylinder 40. The rotation of the hollow cylinder 40 is transmitted to the shaft 41, which is prevented from rotating by the pin 42, and drives the shaft 41 to rotate. By rotationally driving the shaft 41, the grid 4 is rotated via the first grid-side shaft 7 and the second grid-side shaft 8.

As described above, according to this embodiment, the X-ray tube rotation transmission system and the grid rotation transmission system include the hollow cylinder 40, the shaft 41. Since the rotation is transmitted using the transmission mechanism 23, which is made up of a pin 42 and has high rigidity, the rotation of the A thorough X-ray diagnosis is made.

In addition, the transmission gate structure 23 is a grooved hollow cylinder 40°/sleeve 4
1. It has a simple configuration consisting of pins 42 and can be manufactured at low cost.

(Effects of the Invention) As detailed above, according to the present invention, the grid rotation is transmitted as a groove, one end of which is connected to the X-ray tube for synchronous movement, and a pair of grooves are formed facing each other in the axial direction. a hollow cylinder; a shaft having one end connected to rotate the grid and the other end inserted into the other end of the hollow cylinder; and a shaft connected to the shaft to prevent mutual rotation between the shaft and the hollow cylinder. The grid rotation transmission mechanism is provided with a pin that spans the pair of grooves at right angles, so the grid rotation transmission mechanism has high rigidity, is expandable and contractible, and has a low cost. Phase shift is prevented and high-quality images are obtained. It is possible to provide an X-ray orbital tomography apparatus that can obtain the following.

[Brief explanation of drawings]

FIG. 1 shows the Xi! according to the present invention! A configuration diagram showing an example of the IT multi-orbit %FFJm imaging device, Fig. 2 is a perspective view showing the transmission mechanism which is the main part of the same example, and Fig. 3 is an X-ray diagram using the transmission mechanism of the same example. Schematic diagram showing a multi-orbital tomography device, No. 4
The figure is a schematic diagram and does not show a conventional example. DESCRIPTION OF SYMBOLS 1...X-ray tube, 2...Arm, 3...Butsky device, 4...Grid, 5...XI2 tube side first axis, 6
...X-ray tube side second axis, 7...Grid side first axis, 8
...Grid side second axis, 23...Transmission mechanism, 40.
...Hollow cylinder, 40at, 40a2 =-iM,
41--shaft, 42,... pin. Applicant's agent Patent attorney Takehiko Suzue (a) (b) Figure 1 (a) (b) J Third cause

Claims (1)

[Claims] In an X-ray multi-orbit tomography apparatus equipped with a grid rotation transmission mechanism that rotates the grid in synchronization with the movement of the X-ray tube, one end of the grid rotation transmission mechanism is connected to the X-ray tube for synchronous movement, and a hollow cylinder in which a pair of grooves are formed facing each other in the axial direction; a shaft having one end connected to rotate the grid and the other end inserted into the other end of the hollow cylinder; and the shaft and the hollow cylinder. An X-ray multi-orbital tomography apparatus comprising: a pin extending between the pair of grooves at right angles to the axis to prevent mutual rotation with the cylinder.