JPS58223081A - Single-pass collimator for scintillation camera - Google Patents

Abstract

PURPOSE:To obtain a whole reduced image and a partial image with a high resolution simultaneously by varying the opening and closing of a radiation shield plate between the upper and lower halves of a single-pass collimator. CONSTITUTION:A radiation shield plate 1a is opened to the radiation incidence side in the upper half 11 of a single-pass collimator 1 while closed inward to the radiation incidence side in the lower half 12 thereof. This collimator 1 is mounted on a scintillation camera 3 to scan a body 2 of a patient straight once from his tiptoe to head. This enables the simultaneous arrangement of an image of the whole body in an area 13 which a diverging collimator section 11 covers and an image of parts of the body 2 such as back bone, neck and head in an area 14 as expanded in the center which a converging collimator section 12 covers.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a one-no-f collimator for a scintillation camera.

Conventionally, scintillation cameras use a one-bath collimator consisting of a dipering collimator to obtain an image of the patient's whole body in a single whole-body scan (for example, a linear scan from the feet to the head or vice versa). . This dipsing collimator functions as a lens that reduces the image of the whole body, so although an image of the whole body can be obtained, the resolution has to be sacrificed.

In some cases, it is inconvenient.

This invention solves the above-mentioned inconvenience, and uses scintillation technology to simultaneously obtain a reduced image with low resolution of the whole body using a dipaging collimator, and an enlarged image with high Wf performance or an unreduced image, although limited to a certain area. The purpose is to provide a one-socket collimator for cameras.

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows one example of one! Scolimeter 1
on top (the side that is not the radiation incident side).

A plan view seen from the scintillation camera side).

The whole has a disk shape, and a large number of radiation shielding plates 1a parallel to the Y direction and a large number of radiation shielding plates 1b parallel to the X direction are combined in a lattice shape, and each lattice-shaped opening allows radiation to enter Since the direction is now restricted, the first
In the upper half of the figure 11, the radiation shielding plate 1a is opened to the radiation incident side (lower side in FIG. 2) as shown in FIG. 2 to form a dipaging collimator, and in the lower half of the figure 12, the radiation shielding plate 1a closes inward on the radiation incident side (the side shown in FIG. 3) as shown in FIG. 3, forming a conversing collimator. The radiation shielding plate 1b in the X direction is placed perpendicularly to the plane of the paper of FIG. In addition, the conventional one caliper collimator is entirely composed of only a diaphragm collimator as shown in the upper half 11 of FIG. 1, but in this embodiment, the lower half 12 is replaced with a conversing collimator. .

When viewed from the Y direction, as shown in FIG. 4, the viewing range 13 of the dipaging collimator section 11 is wide, and the viewing range 14 of the conversing collimator 2 section 12 is narrow. Therefore, although the field of view 13 of the dipaging collimator section 11 can cover the entire patient's body 2, the obtained image appears to be reduced in size and has a low resolution. On the other hand, although the viewing range 14 of the conversing collimator section 12 can cover only a part of the body 2, it can obtain an enlarged image of that part, so the resolution is high.

When this one-bath collimator 1 is used, Figures 5 and 6
As shown in the figure, by simply attaching this one caliper collimator 1 to the scintillation camera 3 and scanning the patient's body 2 once in a straight line from the feet to the head (or vice versa), the dipurging collimator 11 It is possible to simultaneously obtain a whole body image of the area 13 covered by the converging collimator section 12 and an enlarged image of the central part of the portable body 2 such as the spine, neck, and head of the area 14 covered by the conversing collimator section 12. That is, the one-bath collimator 1 is attached to the scintillation camera 3 so that the height direction of the body 2 is in the Y direction, the scintillation camera 3 is scanned linearly in the Y direction, and the position of the scintillation camera 3 in the Y direction is detected by the position detector 4. The position signals X and Y obtained from the scintillation camera 3 indicate the position of the radiation that has entered the scintillation camera 3, and since they are based on the Zayanagi system with the scintillation camera 3 itself as a reference, the first position signal Y is positive. If it is a corner, it is the position of the radiation that has passed through the diaphragm collimator section 11, and if it is a corner, it is the position of the radiation that has passed through the converging collimator section 1-2.

We will show each. Therefore, a polarity determination circuit 5 determines whether the position signal Y is positive or negative, and if it is positive, an addition circuit 6 adds the Y-direction position signal of the scintillation camera and sends it to a display device 8 such as a CRT as a Y-direction deflection signal. If it is a corner, an adder circuit 7 adds the Y-direction position signal of the cinnarration camera, and then sends it to a display device 9 such as a CRT as a Y-direction deflection signal. An apparatus signal X constituted by the scintillation camera 3 is sent to display devices 8 and 9 as an X-direction deflection signal, and an unranked signal Z is sent as a luminance signal. Therefore, when one linear scan from the tip of one foot to the head is completed, the radiation incident points are accumulated on the display devices 8 and 9, respectively, and the display device 8 shows the area 13 (sixth point) that covers the entire body 2. 1 display device 9 displays a reduced image of a narrow area 1 in the center of the body 2 (see figure).
4 (see diagram IS6) will be displayed.

Note that in the above embodiment, half of the one-caliper collimator, which was supposed to be composed of only a die purging collimator, is replaced with a conversing collimator, but the structure is not limited to the half, and other parts may be used. In addition, if there is no need to enlarge the image and it is sufficient to simply obtain an unreduced image, the radiation shielding plate 1a in the Y direction should also be used with respect to the paper surface of FIG. A vertical or flat cell collimator may be provided in place of the converging collimator described above.

As described above regarding the embodiments, according to the present invention,
By one one or a scolimator. One scan produces a reduced image of the patient's whole body, although the resolution is low.
It is possible to obtain high-resolution images of certain areas at the same time, making it more convenient for doctors' diagnosis by simultaneously observing a general whole-body image and detailed images of specific areas, rather than scales. Accuracy.

improves.

[Brief explanation of drawings]

FIG. 1 is a schematic plan view of a one-bath collimator according to an embodiment of the present invention, FIG. 2 is a schematic cross-sectional view taken along line A-A in FIG. 1, and FIG. Fig. 1 is a schematic cross-sectional view taken along line B-) 3, Fig. 4 is a schematic diagram for explaining the visual field range, and Fig. 5 is an example of application of the one-shape collimator of the above embodiment. The block diagram shown in FIG. 6 is a schematic diagram for explaining the area covered by the visual field range. 1...One bus collimator 11...Dipaging collimator section 12...Conversing collimator section 13.14...Field of view range 1
a, lb...Radiation shielding plate 2...Patient 3
... Scintillation camera 4 ... Position detector
5...Polarity determination circuit 6.7...Addition circuit 8.
9...Display device applicant: Shimadzu Corporation 1st item 2nd circle 3rd country G area 5th self-heating θth

Claims (1)

[Claims] (1) A one-bath collimator for scintillation cameras consisting of a die purging collimator (a one-bath collimator for a tossle scintillation camera, characterized in that a part of the die purging collimator is replaced with another collimator).