JPH069550B2 - X-ray tomography system - Google Patents

Description

Description: TECHNICAL FIELD OF THE INVENTION The present invention relates to X in consideration of safety of a subject to be imaged.
The present invention relates to a line tomography apparatus.

[Technical Background of the Invention] Generally, a tomography apparatus moves a focal point of an X-ray tube along a certain orbit to obtain a sighting tomographic image of the inside of a subject, and at the same time, maintains a certain relationship with the film. The fixed point above is moved along a certain trajectory, and an arbitrary point on one plane that cuts the subject is made to zero the relative speed between the shadow cast on the film surface and the film. When performing such tomography, it is necessary to accurately match the X-ray irradiation field and the tomography plane height (hereinafter referred to as the cross-section height) to a desired position of the subject.

This positioning method will be described with reference to FIG.

FIG. 4 is a schematic view of the X-ray tomography apparatus as viewed from the body axis direction, and the top plate 3 on which the subject 2 is placed is supported on the bed apparatus 1 so as to be movable in the arrow A direction. Then, on the side of the bed apparatus 1, a rotation center mechanism unit 4 is provided for a gantry (not shown).
Is connected to the X-ray tube 6 and the radiation diaphragm 7 at one end through a support arm, and the Bucky device 8 containing an X-ray film is connected at the other end. There is. Although the rotation center mechanism 4 is supported so as to be movable in the arrow C direction, the bed apparatus 1 may be moved in the arrow B direction instead of moving the rotation center mechanism 4. With such a configuration, the connecting rod swings with respect to the subject 2 in the up-down direction (direction perpendicular to the plane of FIG. 4) or in the left-right direction around the rotation center mechanism 4.

First, the positioning of the X-ray irradiation field will be described. The top plate 3 on which the subject 2 is placed is moved in the directions of arrow A and up and down, and the diaphragm 7 is adjusted to an appropriate size. ing. This is the method performed by a general X-ray diagnostic apparatus. Next, the positioning of the face height will be described. By fixing the light projector 9 to the rotation center mechanism 4 and projecting, for example, a cross-shaped light beam L on the side surface of the subject 2, the height of the cut surface at the present time can be visually confirmed. After that, it is general to set the facet height by moving the top plate 3 in the direction of arrow B or the rotation center mechanism 4 in the direction of arrow C while checking the cross shape projected on the subject 2. is there.

[Problems of Background Art] However, in such a mechanism, the above-mentioned X
In order to expand the positionable range of the radiation field, especially the top plate 3
When the moving stroke in the direction of arrow A is formed to be large, the distance S between the top plate 3 and the fault mechanism 10 including the rotation center mechanism 4 and the connecting rod 5 becomes small, and the finger or arm of the subject 2 is caught. There is a fear and it is very dangerous. For this reason, it is conceivable to widen the distance S so that the subject 2 is not caught even when the top plate 3 is closest to the tomographic mechanism 10, but this leads to an increase in the size of the entire tomography apparatus, which is preferable. Absent.

Further, as another method for avoiding the above-mentioned danger, it is conceivable to attach a safety guard 11 having an appropriate body axis direction length to the side surface of the top plate 3 on the fault mechanism side as shown in FIG. However, since it is necessary to limit the height of the safety guard 11 to the extent that the light beam L from the light projector 9 fixed to the rotation center mechanism 4 is not blocked, there is a major drawback that the safety guard 11 does not serve as a safety guard.

[Object of the Invention] The present invention has been made in view of the above circumstances, and an object thereof is to provide an X-ray tomography apparatus including a safety guard in consideration of the safety of a subject.

[Summary of the Invention] In order to achieve the above-mentioned object, in the present invention, in an X-ray tomography apparatus capable of irradiating a side portion of a subject with light from a light projector and performing positioning of a cut surface height of the subject, It is characterized in that it is provided between the light projector and the subject along the longitudinal direction of the specimen, and is provided with a transparent guard member having a longitudinal length that guards at least the arm portion of the subject. It is a thing.

[Embodiment of the Invention] An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. As shown in FIG. 1, a guard plate 12 having an L-shaped cross section and an appropriate length in the longitudinal direction of the bed is formed.
The window 12a extending on the guard plate 12 is formed of a material that allows light to pass therethrough. For example, a transparent acrylic plate is formed to have an L-shaped cross section, or the window 12
Various implementations can be performed, such as using a and a portion other than that as different materials. Further, the length in the longitudinal direction is preferably set so as to extend over the entire length of the top plate 3, but only the arm and leg portions of the subject 2 may be guarded. Further, it is preferable that the height of the window portion 12a is about 10 to 20 cm. The guard plate 12 thus formed has a mounting screw 13 as shown in FIG.
Although it is fixed to the top plate 3 by means of the above, it may be directly adhered to the top plate 3 if there is no problem in maintenance and maintenance.

With this configuration, when the cross-section height of the subject 2 is set, the light beam L from the light projector 9 passes through the window 12a of the guard plate 12 and is projected on the subject. Can be high enough. Therefore, the face height setting operation is not hindered at all, and there is no risk of the finger or arm of the subject being caught in the tomographic mechanism 10. Moreover, since the danger to the subject can be completely removed, the top plate 3 is indicated by the arrow A.
It becomes possible to make the distance S in the state where the tomographic mechanism 10 is closest to the tomographic mechanism 10 to be substantially zero, and the tomography apparatus as a whole can be downsized.

The present invention is not limited to the above embodiment, and can be implemented with various modifications. For example, although the guard plate is described as being fixed to the top plate, the object of the present invention is to be fixed to any member together with the movement of the top plate, that is, if the object has a relative velocity of zero when viewed from the top plate. Can be achieved. Further, although the transparent window portion of the guide plate has been described as covering the entire surface in the longitudinal direction, only the area capable of covering the moving range of the top plate and the projector may be made transparent to form the window portion. Further, it is needless to say that the window portion is not limited to the completely transparent member, and a semi-transparent member or a mesh-shaped material having relatively large individual openings can be used.

[Effects of the Invention] According to the present invention described above, it is possible to provide an extremely excellent X-ray tomography apparatus that eliminates the risk of the subject and does not hinder the setting of the facet height.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a guard plate according to the present invention, FIG. 2 is a view showing a usage mode of the guard plate of FIG. 1, and FIG. 3 is a view showing a usage mode of a conventional guide plate, Figure 4 shows X
It is a schematic diagram for explaining positioning in a line tomography apparatus. 2 ... Subject, 9 ... Projector 12 ... Guard plate, 12a ... Window, 13 ... Mounting screw

Claims (1)

[Claims] 1. An X-ray tomography apparatus capable of irradiating a side of a subject with light from a projector to perform positioning of a cross-section height of the subject, comprising: the projector and the subject along a longitudinal direction of the subject. An X-ray tomography apparatus, comprising: a transparent guard member having a length in a longitudinal direction for guarding at least the arm portion of the subject.