JPH0135653B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a head holding device for a CT apparatus used for radiation tomography.

[Technical background of the invention and its problems]

Conventionally, in a whole-body CT device that can take tomographic images of the whole body of a subject, when photographing the head, the top plate 1 of the bed is used as shown in Fig. 1.
A head holding device 3 is used to place the head of a subject (hereinafter also referred to as a patient) 2. Then, at the center 4a of the pedestal 4, tomography of the head is performed, for example, by irradiating X-rays from the front side to the back side of the figure. At this time, some of the patients 2 have bent necks due to accidents, etc., as shown in Figure 2.
In consideration of performing head photography without putting a burden on patient 2, we have conventionally shown the images in Figures 3 and 4.
A bed apparatus for a CT apparatus is provided. In the bed device shown in FIG. 3, the head support device 3 and the top plate 1 are integrated, and the arrow A or B shown in the figure
It is designed to be able to turn in any direction. Furthermore, in the case of the bed device shown in FIG. 4, in addition to the functions shown in FIG. ing. Since such equipment is available,
Although it was possible to photograph the head without placing any burden on the patient 2, the following disadvantages occurred during the photographing process. To explain this with reference to FIGS. 5 and 6, as shown in FIG. In order to obtain a tomographic image of
The head holding device must be rotated α degrees relative to the top plate 1 in the direction opposite to the top plate. At this time, the center 2a of the head of the patient 2 is located at a position shifted by ρ from the center 4a of the gantry. However, as shown in FIG. 6, since the center of the X-ray imaging area 5 coincides with the center 4a of the gantry, the center 2a of the head is also located at ρ from the center of the X-ray imaging area 5.
It will be set at the position moved by . At this time, in the CT apparatus, the image is clear at the center of the imaging region 5, but the resolution of the image deteriorates as it approaches the periphery from the center. This is because the X-ray tube and detector are intermittently rotated around the center 4a of the mount, so the X-ray path becomes denser in the center and becomes coarser toward the periphery, resulting in a difference in the amount of data. This is because it is based on. Therefore, when photographing the head, it is desirable to align the center 2a of the head with the center 4a of the gantry, that is, the center of the photographing area 5, but such a head holding device for a CT apparatus has not been provided in the past. Ta.

[Purpose of the invention]

The present invention has been made in view of the above circumstances, and allows for tomographic imaging by aligning the center of the subject's head with the center of the imaging area without imposing a burden on a subject with a crooked neck. It can be performed
The object of the present invention is to provide a head holding device for a CT device.

[Summary of the invention]

To achieve the above object, the present invention provides a head holder for a CT apparatus that is attached to a top plate on which a subject is placed and holds the head of the subject.
a fixing member detachably provided on the top plate; a movable member pivotally supported by the fixing member and capable of sliding in the transverse direction of the top plate on a plane parallel to the subject placement surface of the top plate; The apparatus is characterized by having a head rest whose one end is pivotally supported by a movable member and which is pivotable about the pivot on a plane parallel to the subject placement surface of the top plate.

[Embodiments of the invention]

Hereinafter, one embodiment of the present invention will be described with reference to the drawings. Figures 7 and 8 show an embodiment of the present invention.
FIG. 2 is a schematic perspective view and a cross-sectional view showing the internal structure of a head holding device for a CT device. In FIGS. 7 and 8, the head holding device for a CT apparatus includes a head rest 6 that can pivot in the direction of arrow A or B in the figure around a fulcrum E, and a head rest 6 that holds the head rest 6 in a freely pivotable manner and also supports arrow C in the figure. Alternatively, it is composed of a movable member 7 that can slide in the D direction, and a fixed member 8 that slidably holds the movable member 7 and is detachably attached to the top plate 9. The head rest 6 has an appropriate shape so that the center 2a of the head of the patient 2 is placed on the gantry center 4a (see FIG. 5), and is on the gantry center line 4b. A hole 6 is formed at the fulcrum point E, which is separated by a predetermined distance from the center 4a of the pedestal to the top plate 9 side.
It has a. The movable member 7 is provided along the gantry center line 4b, has the head rest 6 placed on one end thereof, and has a hole 7a at a position overlapping with the hole 6a of the head rest 6. A bolt 13 is inserted into the holes 6a and 7a, and a thumbscrew 15 is attached via a washer 14 on the side facing the movable member 7, so that the headrest 6 and the movable member 7 can be semi-fixed. ing. Further, the other end of the movable member 7 is provided with a nut 7b whose threaded portion is provided along the directions of arrows C and D in the figure. Furthermore, the bottom surface 7c of the movable member 7 has a V
A protruding ridge 7d protruding in the shape of a letter is provided along the directions of arrows C and D in the figure. The fixed member 8 has a guide groove 8a that slidably guides the protruding edge 7d of the movable member 7, and the nut portion 7 of the movable member 7.
A notch portion 8b is provided so that b can move along the direction of arrow C or D in the figure. Furthermore, through holes 8c, 8c are provided at both ends of the notch 8d in the fixing member 7 in the directions C and D in the drawing, facing the screw holes of the nut portion 7b,
A lead screw 10 is inserted through the through holes 8c and the screw hole of the nut portion 7b. In the lead screw 10, a thread is provided only in the portion that spans the notch 8b, and this thread is threaded into a threaded hole in the nut portion 7b. A handle 10a is provided at one end of the lead screw 10 protruding from the fixing member 8. E-rings 11 and 11 are used to prevent the lead screw 10 from coming off. This fixing member 8 is a top plate 9
It is semi-fixed at one end with a screw 12.

The operation of the head holder for a CT apparatus constructed as described above will be explained with reference to FIGS. 9a, b, c, and d. First, in a normal state, both the head holder for the CT apparatus and the top plate 9 are on the center line 4b of the gantry (see FIG. 9a). At this time, for the convenience of the patient 2, both the head holder for the CT apparatus and the top plate 9 are rotated by α degrees about the center 4a of the gantry (see FIG. 9b). This effect can be achieved by the radiodiagnostic bed device (filed on March 3, 1982) previously filed by the present applicant. Next, loosen the thumbscrew 15 and move the headrest 6 to the fulcrum E (i.e., the thumbscrew 15
After turning α degrees around the same position, the thumbscrew 15 is tightened to set the head center line 6b of the head rest 6 and the pedestal center line 4b parallel to each other (see FIG. 9c). In this state, the head center line 6b of the headrest 6 and the gantry center line 4b are separated by a distance ρ, and therefore, as described above, it is not possible to obtain a good tomographic image. Therefore, when the handle 10a is rotated in a predetermined direction to rotate the lead screw 10, the nut 7b screwed into the intermediate portion of the lead screw 10 moves in the direction of the arrow D shown in the figure. With this movement, the movable member 7 moves in the direction of arrow D in the figure with respect to the fixed member 8. Therefore, the head rest 6 semi-fixed to the movable member 7 also moves in the direction of the arrow D in the figure along with the movement of the nut 7b.
The head center line 6b of the head rest 6 can be set to coincide with the frame center line 4b (9th
(see figure d). With the above-described effects, even when photographing the head of the patient 2 whose neck is bent, it is possible to align the head center line 6b with the gantry center line 4b, that is, the center of the photographing area, without imposing a burden on the patient. This makes it possible to perform better tomography. or,
If the head holder for a CT apparatus is not needed, the head holder for a CT apparatus can be detached from the top plate 9 and stored by loosening the screws 12.

It goes without saying that the present invention is not limited to the embodiments described above, and includes various modifications within the scope of the gist of the present invention. For example, the fixing member 8
The method of moving the movable member 7 is not limited to the lead screw and nut methods shown in the above embodiments, but various linear feed methods such as the rack-pinion method can be applied. Further, the method of semi-fixing the headrest 6 in a rotatable manner in the movable member 7 is not limited to the method of pressing and holding the contact surfaces of each other with the thumbscrew 15, for example, using a click mechanism,
It may be semi-fixed for each minute turning angle.

〔Effect of the invention〕

As explained above, according to the present invention, even for a patient with a bent neck, the head can be held without imposing a burden on the patient, and the center of the patient's head can be aligned with the center of the imaging area. It is possible to provide a head holding device for a CT device that is capable of performing tomography.

[Brief explanation of drawings]

Figures 1, 2, 3, 4, and 5 are schematic explanatory diagrams for explaining the conventional bed apparatus for CT apparatus, and Figure 6 is the imaging area of the conventional bed apparatus for CT apparatus. 7 and 8 are a schematic perspective view and a cross-sectional view thereof showing a head holding device for a CT device according to an embodiment of the present invention, FIGS. 9a, b, c, and d are schematic explanatory diagrams for explaining the operation of the present invention. 4a... Center of the pedestal, 4b... Center line of the pedestal, 6...
...Headrest, 6b...Head center line, 7...Movable member, 7b...Nut, 7d...Protruding ridge, 8...
...Fixing member, 8a...Guide groove, 9...Top plate, 10
...Lead Screw.

Claims (1)

[Claims] 1. In a head holder for a CT device that is attached to a top plate on which a subject is placed and holds the head of the subject, a fixing member detachably provided on the top plate;
A movable member is pivotally supported by the fixed member and is slidable in the transverse direction of the top plate on a plane parallel to the subject placement surface of the top plate, and a movable member whose one end is pivotally supported by the movable member is 1. A head holding device for a CT apparatus, comprising a headrest that is pivotable about the pivot on a plane parallel to a subject placement surface.