JPS5931600A - X-ray collimator used for head x-ray photographing - 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] The present invention relates to x-ray collimators.

In radiography of the head, the patient is placed in a fixed axis of coordinates that can be rotated with respect to the radiography apparatus to allow 161 views from different directions.

Positioning the patient through the human body and the patient's ear cavity44
It is done relative to a straight line. If the patient is side-viewed, for example, on an 8 inch x 10 inch film, it is necessary to have a shutter that trims the head so that the patient's chin and nose are clearly visible. The photograph is asymmetrical and perpendicular to the straight line passing through the ear cavity. On the other hand, when the photograph is taken from the front or the tangential direction, the patient's head is usually positioned in the center of the photograph and the film is placed in a horizontal position. Therefore, when changing the image gripping position, the position of the imaged area relative to the imager changes and the shutter is changed to a new shutter, i.e. the photo on the film is trimmed to the same dimensions and the 11π shadow is changed. It is necessary to replace the area with a trimmed shutter so that it is positioned symmetrically.

For this reason, in conventional head imaging, for each different imaging, a seat plate suitable for each imaging is prepared in a separate kittridge that moves on run 1-. It is complicated and slows down the shooting time.

An alternative solution to the above is disclosed in US Pat. No. 3,569,712. According to this, the size of the fixed collimator aperture is adjusted by shuttering from one edge by the slide-like play 1. By rotating this play 1~ around the collimator body, the opening of the collimator can be shuttered from any angle. This solution takes up a lot of space and exposes the patient to an unnecessary amount of IJJFd.

Each has 17 ivy growing around it from one edge, and
Make sure that the remeter frontage is sufficiently mowed to cover all the radiation ray 1 projection areas (this is because it will not be possible if the remeter is pulled).

U.S. Pat. No. 3,849,649 shows a remeter in which the size of the remeter aperture can be reduced by rotating the separate shutter element by 90 degrees.
There is. This shutter element has an opening with the same dimensions as the remeter [j]. This collimator is not very effective if the position of the most shadowed area is shifted relative to the collimator, since its aperture is always positioned symmetrically with respect to the collimator body.

It is an object of the present invention to eliminate the above-mentioned drawbacks of the prior art and also to improve
The object of the present invention is to provide a new "remetering device" which can be adapted to

The remeter device according to the present invention includes a collimator body provided with a shutter element 1 having an aperture through which X-rays pass and restricts the convergent X-rays to a desired size and shape. Menu 1~ are installed in the transverse plane of the remeter body so as to be rotatable around the axis of symmetry of the remeter body, and eccentrically placed with respect to the remeter body to restrain the X-rays. The center of the aperture can be rotated such that the center of the aperture can be shifted onto or surrounded by the axis of symmetry of the collimator body.

Hereinafter, embodiments of the present invention will be described in detail based on the attached four drawings.

In the drawing annex f, the reference numeral 1 designates a collimator body, which body has a support element 2 with a signal IT1j11 received therein. Number 3 indicates the shutter plate 1, and a shutter plate 6 having an open lower portion through which X-rays can be transmitted is provided in this element by a member 8.

If the target (area) to be imaged requires the use of a different N method or aperture shape, the shutter plate 6 can be replaced with a new one as necessary. On the other hand, it is possible to take pictures with a single aperture of a certain shape and size.
In such cases, the open lower is formed within the shirt sleeve element 1-3 and a separate sealer plate 6 is not required. The center of the aperture 7 is indicated by Pl and -C.

The shutter element 3 is supported by a support pin 4 and a support member h2. The shutter element 3 also has a control means (lever) 5 extending beyond the body 1.
, thereby controlling the displacement of the scirett elements 1 to 3 with respect to the main body 1.

The support element 2 is provided with a guide edge 9, which edge determines the degree of freedom of rotation of the shutter element 3 about the bin 4. On the other hand, the guide edge 9 and the control means 5 are also used to effect a rotation of the support element 2 and the shutter element 3 relative to the center line P2 of the body 1. The collimator is also provided with a movable lid 10 that includes an X-ray transparent hole.

In the embodiment shown in FIGS. 1-4, the supporting element 1-2 is journal-bearing in the inner jacket portion of the main body 1. In the embodiment shown in FIGS. Since the main body 1 is fixed, the control means 5 for the shutter element 3 are provided in its jacket.
It would be necessary to provide a throat opening (not shown) to allow all the necessary displacements of the 4J. On the other hand, in the embodiment shown in FIGS. 5 and 6, the support element 2 is journalled around the body 1. In the embodiment shown in FIGS. The guide edge 9 therefore directly determines the size of the opening required by the control means 5.

Since the operation of the collimator according to the two embodiments described above is similar, only the operation of the collimator shown in FIGS. 1 to 4 will be described.

In FIG. 1, the opening lower is in a vertical position and is arranged asymmetrically with respect to the central axis P2 of the main body 1. Therefore, in head radiography, this state of the collimator is used when the head is imaged from the side. When shadowing the head from the front or back, perform the following steps. The control means 5 is moved from one guide edge 9 to the other guide edge 9 in FIG. Move it until it works. That is, the control means 5 rotates the support member 2 until the open lower part is in its horizontal position. By doing this, the area to be photographed becomes symmetrical with respect to the central axis P2 of the open lower part and the main body.

On the other hand, from a state in which the head is photographed from one direction or from behind,
To move the head into a state where the head is tilted from the side, perform the opposite operation to the above.

As a variant of the embodiment described above, the body 1 itself can also be rotated to change the opening lower from vertical to horizontal or vice versa, in which case the body 1 can be mounted on or on an X-ray generator (
=JtJ should be journal bearing on the member.

[Brief explanation of the drawing]

Fig. '1 is a top view of the collimator according to the present invention; Fig. 2 is a - - - line diagram of Fig. 1; Figs. 3 and 4 show different operating positions of the collimator of Fig. 1. FIG. 5 is a diagram showing a remeter according to another embodiment; FIG. 6 is a Vl-VI diagram of FIG. 5. Hair/ノ(〆0

Claims (6)

[Claims] (1) In an X-ray collimator used for X-ray removal, the main body of the cylindrical collimator is connected to an X-ray generator and is used to concentrate X-rays. and an aperture (
7) comprising a collimator body (1) in which a shutter element 1-(3) is provided, characterized in that the shutter element (3) can rotate around the axis of symmetry of the collimator body (1): The center (Pl) of the aperture, which is provided eccentrically with respect to the remeter body and restricts X-rays, is placed on the axis of symmetry (P2) of the collimator body or The X-ray collimator is rotatable so that it can be shifted away from it. (2) The remeter body (1) has two supporting elements (2) provided therein, and the two members (1-) support the shutter element (3) so that the shutter element (3) can be rotated as described above.
A collimator according to claim 1, having a pin (4) located at an eccentric position for the collimator. (3) The shutter element h (3) has a control element ('j, (5)) extending beyond the collimator body to the outside for displacing the shutter element l-;
Also, the support element (2) or the guide edge (9) is on the right, and the edge is the support element (2) of the shutter element ~ (3).
), and the rotation of the support element is carried out via this guide edge. (4) The support element +-<2) is the collimator body (1
The collimator according to claim 3, wherein the collimator is arranged inside the main body and is rotatably supported by the inner jacket surface of the main body. (5) The support element (2) is connected to the remeter body.
1) Di-V shell 1 extending at least partially on the circumferential surface of
3. A remeter according to claim 3. (6) Claims 1 to 5, in which the above-mentioned Shitotsuta plates (6) are provided as means (8) for interchangeably supporting Shitotsuta plates (6) of various openings.
The collimator described in any of the paragraphs.