JPH1130670A - Honeycomb structure body for collimator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To dissolve troublesomeness of replacing a collimator and make photographing work efficient by setting lateral or vertical parts from the top view, to different honeycomb dimensions, hole diameters and wall thickness. SOLUTION: A honeycomb structure body 1a is composed of two lateral areas from the top view. In the right half area, the diameter of a honeycomb hole 2 is 2.0 mm in the dimension between the opposite sides of a hexagon, and the thickness of a honeycomb wall 3 is 0.2 mm so as to form a structure part of high sensitivity. In the left half part, the diameter of a honeycomb hole 2 is 1.0 mm in the dimension between the opposite sides of a hexagon, and the thickness of a honeycomb wall 3 is 0.1 mm so as to form a structure part of high resolution. Two blocks are jointed to constitute a composite honeycomb structure body 1a with high sensitivity and high resolution. This results in providing a honeycomb structure body for a collimator dissolving troublesomeness of replacing the collimator and used for efficient photographing work.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a fine honeycomb structure of a collimator used for a scintillation camera or the like.

[0002]

2. Description of the Related Art A collimator for a scintillation camera passes only gamma rays having a desired direction among gamma rays emitted from radioisotopes distributed in the body in order to capture a radioisotope distribution image. It is used for

[0003] Such a collimator is generally formed of a material that is opaque to gamma rays and has a large specific gravity and atomic number. In particular, in terms of ease of processing and cost, a block of lead or a lead alloy is used. Based on the above, gamma rays can be passed by forming a large number of fine straight holes in the lead or lead alloy block.

FIGS. 3 and 4 show an example of a conventional collimator for a scintillation camera. As apparent from these drawings, the collimator for a scintillation camera includes a honeycomb structure 1 having a uniform hole distribution, and a large number of honeycomb holes 2 are perforated perpendicular to the plate surface. Reference numeral 3 denotes a honeycomb wall defining the honeycomb hole 2. In this conventional example, the honeycomb hole 2 has a hexagonal hole shape.

[0005]

The conventional collimator as described above; FIGS. 3 and 4 show the following problems. That is, in order for the honeycomb structure 1 to have characteristics of high sensitivity to transmission of gamma rays, it is necessary to increase the diameter of the honeycomb holes 2 or to reduce the length (thickness) of the honeycomb holes 2. is there. Further, in order to provide high-resolution characteristics, it is necessary to reduce the diameter of the honeycomb hole 2 to a small one or to increase the length (thickness) of the honeycomb hole 2. Further, in order to use gamma rays using high-energy radioisotopes, it is necessary to make the honeycomb wall 3 thick.

The collimator thus constructed is classified into a high-sensitivity collimator, a high-resolution collimator, and the like according to the type of image to be photographed, and furthermore, according to the magnitude of the radiation energy of the radioisotope used. It is divided into low energy use and high energy use. Therefore, where a scintillation camera is installed, it is necessary to always prepare various types of collimators, and when using them, select a collimator for each shooting purpose from among various types of collimators. Then, each time, a camera suitable for a photographing purpose was attached to a scintillation camera and used.

As described above, when using a collimator, a collimator suitable for each photographing purpose is selected.
Replacing the selected collimator with a scintillation camera every time shooting is a very laborious and laborious task.

Therefore, the problems to be solved by the present invention (objects)
An object of the present invention is to provide a honeycomb structure for a collimator capable of eliminating troublesome replacement of a collimator and providing an efficient imaging operation. This problem (object) leads to providing a honeycomb structure for a collimator having high sensitivity; high resolution; high energy; low energy and having several characteristics.

[0009]

According to a first aspect of the present invention, there is provided a method comprising: a honeycomb portion having different left and right or upper and lower portions when viewed from a plane portion;
It consists of a honeycomb structure for a collimator.

According to the honeycomb structure having the above-described structure, a portion exhibiting high sensitivity characteristics and a portion exhibiting high resolution characteristics with respect to transmission of radiation (gamma rays) can be constituted only by attaching to a single collimator. This allows efficient imaging without requiring collimator replacement.

Further, the second means provided by the present invention comprises a honeycomb structure for a collimator in which the right, left, upper and lower portions when viewed from a plane portion have different honeycomb dimensions; hole diameter, and wall thickness.

According to the honeycomb structure having the above-described structure, a portion exhibiting high sensitivity characteristics to radiation (gamma ray) transmission, a portion exhibiting high resolution characteristics, and a portion exhibiting high resolution characteristics can be obtained simply by attaching the honeycomb structure to one collimator. Can make up a part for high energy and a part for low energy, enabling efficient imaging without the need to replace the collimator.

[0013]

1 and 2 show an embodiment embodying the first means of the present invention. FIG. 1 is a plan view of a composite honeycomb structure for a scintillation camera, and FIG. XX ′ section of FIG.

The honeycomb structure denoted by reference numeral 1a is composed of two areas on the right and left sides when viewed from a plane. In the right half area, the diameter of the honeycomb hole 2 is, for example, 2.0 mm in a hexagonal opposite side dimension. The honeycomb wall 3 has a high sensitivity with a thickness of 0.2 mm.

In one left half, the diameter of the honeycomb hole 2 is
For example, the honeycomb wall 3 has a hexagonal side dimension of 1.0 mm.
It is composed of a high-resolution structure with a thickness of 0.1 mm.

The left and right honeycomb structures having different diameters of the honeycomb holes 2 and different thicknesses of the honeycomb walls 3 are formed from separate blocks of lead or lead alloy, and the two blocks are formed. By joining the side surfaces together, a composite honeycomb structure 1a is formed, which is a collimator having both characteristics of high sensitivity and high resolution.

Although the above-described embodiment shows the first means of the present invention, that is, the structure in which the left and right portions have different honeycomb dimensions, it is possible to provide a composite honeycomb structure comprising a larger number of areas. It is. For example, when viewed from a plane, a composite honeycomb structure having three areas of a left side, a center part, and a right side can be used.

The above-described embodiment (and the above-described modified example)
By dividing into left and right or left; center; right as seen from the plane, when CT imaging is performed by rotating around the human body, by rotating in the same direction as the disassembly,
There is an effect that normal CT imaging can be performed without different information from different honeycomb dimensions overlapping.

On the basis of the second means of the present invention, it is possible to provide a composite honeycomb structure in which the four portions on the left, right, upper, and lower sides when viewed from a plane have different dimensions.

In the above-described embodiment, the honeycomb holes 2 in the honeycomb structure 1a have a hexagonal hole shape. However, the present invention is not limited to this, and may have a circular, triangular, or quadrangular hole shape.

[0021]

According to the present invention as described above, it is possible to provide a honeycomb structure for a collimator capable of eliminating troublesome replacement of a collimator and providing an efficient photographing operation. Sensitivity; high resolution; high energy;
Expected problem to provide a honeycomb structure for collimator having several characteristics for low energy (objective)
Can be achieved.

[Brief description of the drawings]

FIG. 1 is a plan view of a honeycomb structure for a scintillation camera collimator according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line XX ′ of FIG. 1;

FIG. 3 is a plan view of a honeycomb structure for a scintillation camera collimator according to a conventional example.

FIG. 4 is a sectional view taken along line XX ′ of FIG. 3;

[Explanation of symbols]

 1a Honeycomb structure 2 Honeycomb hole 3 Honeycomb wall

Claims (2)

[Claims] 1. A honeycomb structure in which left and right or upper and lower portions are different from each other when viewed from a plane portion;
Honeycomb structure for collimator. 2. A honeycomb structure for a collimator, wherein each of left, right, upper and lower portions when viewed from a plane portion has a different honeycomb size; a hole diameter and a wall thickness.