JPS5822723Y2 - Kasetsutehojisouchi - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cassette holding device for a rotating transverse imaging device that can hold a film cassette according to the shape and position of a lesion on a subject.

A rotating transverse imaging device has an X-ray tube and a film placed opposite to each other with the subject in between, and rotates the X-ray tube and film along the outer periphery of the subject, for example, with the subject's body axis as the center of rotation. In this case, the X-ray beam emitted from the X-ray tube is effectively applied to the film, and the X-ray image of the cross section of the subject is obtained by moving the film. In order to avoid unnecessary exposure to radiation, an irradiation field narrowing device is installed to match the shape of the film.

Conventionally, this irradiation field diaphragm device has generally been constructed so that the radiation opening of the X-ray tube has an aperture plane that intersects at right angles to the center line of the radiation flux.

Furthermore, this aperture device is configured to rotate around the subject in conjunction with the X-ray tube, and the size of the aperture surface of the aperture device does not depend on the shape of the lesion on the subject, but at least on the size of the film. The settings must be adjusted accordingly.

Therefore, even if the lesion size is small, the aperture of the aperture device must be made large to match the shape of the film, which exposes the subject to more radiation than necessary.

Alternatively, there are problems such as an increase in scattered radiation and a deterioration in the image quality of the cross-sectional photograph taken.

Therefore, as a solution to such problems.

Recently, the inventor of the present invention has realized a rotating transverse photographing device capable of limited aperture operation.

This rotating transversal imaging device is equipped with a diaphragm device having an opening parallel to the cross section of the subject on the X-ray tube emission port side of the support arm that supports the X-ray tube and film. X
It is configured to rotate in synchronization with the rotation of the wire tube and film.

According to this rotating transversal imaging device, the aperture of the aperture device can be narrowed to match the shape of the lesion, and unnecessary exposure of the subject to radiation can be prevented or the influence of scattered radiation can be eliminated.

By the way, as mentioned above, although the aperture device has been improved and limited aperture operation has become possible, no improvements have been made on the film side.

That is, the X-ray film is generally stored in a cassette together with an intensifying screen, and the X-ray film is mounted on a cassette holder of a rotating transverse imaging device.

In this case, the cassette holding device is constructed as shown in FIGS. 1a and 1b.

Here, 1 is the X of the supporting arm rotating around the subject's body axis.
It is a rotating shaft that is provided on the side opposite to the wire tube side and rotates in synchronization with the rotation of the support arm, and has a rising portion in the left and right directions with respect to this rotating shaft, and holds the cassette 2 from the left and right sides. A retaining plate 3 is fixedly attached.

Furthermore, a ball catcher 6 is mounted on the holding plate 3 at its lower end, which is pivoted to the holding plate 3 by a hinge 4, and at its upper end.
are provided and fitted onto the holding plate 3, and a holding plate 6 is provided which has L-shaped fastening portions at the upper and lower ends and holds the cassette 2 from above and below.

When the cassette is attached, the holding plate 6 is pulled out in the direction A as shown by the two-dot chain line in FIG. is pushed back in the direction B, and the holding plate 3 is pushed back by the ball catcher 5.
The cassette 2 is held by the cassette 2.

Furthermore, the shape of this cassette holding portion is generally constant.

Therefore, in the above-mentioned rotary cross-sectional imaging device capable of controlling the limited aperture, when performing cross-sectional imaging of a specific lesion C7 or C2 of the subject 7 as shown in FIG. However, the cassette 2 must be sized according to the cross section of the subject 7, and of course the film 8
However, a large film must be used to fit the cassette 2, leading to wasted film and inconvenience when carrying the cassette 2 and developing it.

Therefore, the present invention was developed in view of the above-mentioned circumstances, and even if the size of the cassette holding part is constant, the cassette that can be held by this holding part can be selected from any size according to the shape of the lesion. To provide a cassette holding device for a rotating transverse photographing device, which can be used in a rotary transversal photographing device and can be installed at any desired position, thereby eliminating waste of film and facilitating handling.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings in which the same parts as in FIGS. 1 and 2 are denoted by the same reference numerals.

Figure 3 is a front view of the device of the present invention, and Figure 4 is Figure 3I.
It is a sectional view taken along the line V-IV.

Here, reference numeral 11 denotes a frame for mounting a cassette which is held from the left, right, top and bottom directions by the holding plates 3 and 6 shown in FIG.
Attach 2a and b.

Further, 13a and 13b are moving rails for holding cassettes which are bent into an L shape in directions facing each other and have guides 14a, b, c, and d at both ends thereof, which are loosely passed through the guide shafts 12a and 12b. Yes, the guide 14 a + b +
c + d are fixed to the guide shafts 12a, b by fixing screws 15a, b, c, d.

Furthermore, 16a and 16b are respectively formed integrally with the moving rails 13a and 13b, and are bent into an L shape in the opposite direction to 13a and 13b.
This is a fixed rail for holding a cassette which is fixed to the upper and lower ends of the moving rails 15a and 15b and bent into an L shape in a direction facing the moving rails 15a and 15b.

Furthermore, the guide shafts 12a, b and the moving rail 13a.

cassette position setting scales 13a and b6 (engraved) are respectively engraved on b.

Thus, the cassette mounting section is constructed as described above, and as shown in FIGS. After that, the holding plate 6 is fitted onto the holding plate 3 by the ball catcher 5 and attached to the holding portion.

Next, assuming that the projection of the diseased part onto the holding part is at the position C1 shown in FIG.
Loosen C9d and move rail 13a.

The moving rail 13a is sandwiched between the cassette 21 and the moving rail 13a.
, b in the vertical direction, and the moving rail 13a.

By moving the cassette 2 between the positions B and B, the cassette 21 is set according to the position of the lesion C1, as shown in FIG. 5A.

The actual setting operation of the cassette 21 is based on the distance from the focal point of the X-ray tube to its center of rotation, the distance to the rotation axis 1 of the holder, the size of the aperture of the aperture device, etc. The position of the jamming cassette 21 is determined in the vertical direction, and furthermore, the horizontal direction is set using the scale 18b.

Thereafter, the guide portions 14a, b, c, d may be fixed at the positions using the fixing screws 15a, b, c, d, and photographing may be performed.

In addition, as shown in FIG. 2, if the projection of the lesion on the holding part is on the upper right side, move the cassette C2 according to the size of the lesion C2 to the moving rail 16 as shown in FIG. 5.
a and the fixed rail 17a, and set the position in the same manner as described above.In this case, the guide shaft 12a of the guide portions 15a, b, c, d
, b or between moving rails or between a moving rail and a fixed rail, the cassette may be moved manually, or the rotational movement of the motor may be controlled by an appropriate means such as a rack or pinion mechanism. It may be converted into a linear motion and performed under electric control.

By the way, in the above-mentioned embodiment, the cassette is mounted between a movable rail which is provided as a cassette mounting part and is movable in the vertical direction within a frame held by a holding part, and a fixed rail which is attached to the upper and lower ends of the frame. Although the position is set by holding it in place, the same effect as described above can be obtained even if it is done in a linear manner.

That is, as shown in a side cross-sectional view in FIG. 6, an iron plate 20 on which position setting scales are engraved on a plane is attached to the frame 11.

On the other hand, as shown in FIG. 7, a cassette holder 23 is prepared which has a holding portion for holding the cassette 23 from three directions and has small magnets 21 and 22 on its back surface.

Thus, the cassette holder 2 with the cassette 23 attached
By attracting and holding the cassette 23 at a predetermined position on the iron plate 20 by small magnets 21 and 22, a cassette 23 of a size corresponding to the shape and position of the lesion can be arbitrarily held.

Furthermore, in place of the iron plate 20 and the small magnet in FIG. 6, a well-known hooked tape may be used.

Furthermore, the present invention not only allows the use of a film cassette of any size required, but also allows the orientation of the film cassette to be arbitrarily selected (vertically or horizontally) when the film cassette is attached to the cassette mounting section. Therefore, in combination with the effect of the limited diaphragm described above, it becomes possible to take pictures in two or four divisions, and the economical efficiency of the film is greatly improved.

In addition, the present invention is not limited to the embodiments described above and shown in the drawings, but can be implemented with various modifications without changing the gist thereof.

As described above, according to the present invention, the cassette mounting section is configured to be attached to the film holding section of the rotating transverse photographing device and to hold a film cassette of any shape at any position. .

A cassette that stores the minimum size of film required for cross-sectional imaging of the lesion can be used, and divisional imaging is also possible, eliminating wasted film and making handling such as carrying and developing operations easy. Therefore, it is possible to provide a cassette holding device for a rotating transverse photographing device that can improve the efficiency of photographing work.

[Brief explanation of the drawing]

Figures 1a and b are configuration diagrams showing the cassette holding section of a rotating transverse imaging device, Figures 2a and b are diagrams for explaining the operation of the conventional cassette holding unit, and Figure 3 is an implementation of the present invention. A configuration diagram showing an example, Fig. 4 is a sectional view taken along the line ■-■ in Fig. 3, and Fig. 5
Figures a and b are diagrams showing an example of mounting a cassette according to the same embodiment, and Figures 6 and 7 are configuration diagrams showing another embodiment of the present invention. 11... Frame, 12a, b... Guide shaft, 13a. b + 16 a s b...Moving rail,
17a, b...Fixed rail

Claims (1)

[Scope of utility model registration request] An X-ray tube and a film are placed facing each other with the subject in between, and the X-ray tube and film are rotated around the subject at the same angular velocity about a common axis of rotation to cross the subject. In addition to performing surface imaging, a diaphragm opening located between the X-ray tube and the subject and parallel to the cross section of the subject is rotated with respect to the common rotation axis. In a rotating transverse imaging device equipped with a limited diaphragm that rotates in synchronization, a cassette mounting part is detachably attached to a holding part for holding a film cassette; A cassette mounting part that removably attaches and holds a film cassette smaller than the film cassette corresponding to the holding part in any position and in a desired orientation among a plurality of orientations including at least vertical and horizontal orientations according to the shape and dimensions. A cassette holding device for a rotating transverse photographing device, characterized by comprising: