JP2000249767A - Manufacturing method of gamma ray collimator, gamma ray collimator, and nuclear medicine diagnostic apparatus - Google Patents

Abstract

An object of the present invention is to provide a method of manufacturing a collimator for a nuclear medicine diagnostic apparatus capable of focusing radiation from a subject to a desired arbitrary position with high accuracy. A shielding plate capable of shielding gamma rays is provided.
c, a through-hole forming step of providing the through-hole 14 at a predetermined position;
Shielding plates 13a to 13c are laminated at a predetermined interval, and a through-hole 14 in which the shielding plates 13a to 13c hold relative positions of the through holes 14 with each other and which transmits at least gamma rays in the stacking direction of the shielding plates 13a to 13c. The method includes a holder disposing step for disposing the bodies 15a to 15c, and a fixing step for fixing the cylindrical bodies 15a to 15c and the shielding plates 13a to 13c.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a collimator used in a nuclear medicine diagnostic apparatus and a method of manufacturing the collimator, and more particularly to a method for measuring a gamma ray emitted from a subject such as a patient.
It relates to an object suitable for focusing on an arbitrary position. Further, the present invention relates to a nuclear medicine diagnostic apparatus using such a collimator.

[0002]

2. Description of the Related Art Radioactive isotopes (radioisotopes; RI) are injected into a subject such as a patient, and radiation such as gamma rays (γ rays) emitted from the body is detected by a one-dimensional or two-dimensional detector. By obtaining and measuring the RI distribution, single photon emission computed tomography (SPECT; Single Pho) that displays a functional distribution image of a lesion in the body, blood flow, fatty acid metabolism, etc.
ton Emission Computed Tom
An SPECT apparatus using an O.P.G. It also has multiple detectors, positrons (positrons)
Is bound by electrons (negative electrons) and disappears.
2. Description of the Related Art A PET apparatus using simultaneous detection type boditron emission computer tomography (PECT) that performs imaging by simultaneously detecting gamma rays emitted in a direction of 0 ° is known.

[0003] Recently, an SPEC equipped with a plurality of detectors for performing the SPECT and the simultaneous detection type PET has been proposed.
CT apparatuses are being used. All of these devices are generally collectively referred to as nuclear medicine diagnostic devices.

In such a nuclear medicine diagnostic apparatus, a collimator for calibrating the traveling direction of a gamma ray incident on a radiation semiconductor detector is used.

When manufacturing a parallel hole type collimator in which through holes for parallelizing the traveling direction of gamma rays are formed in parallel, first, as shown in FIG. 25, two rolls 100 having irregularities on the surface are used. , 101 lead plate 1
26, a plurality of corrugated lead plates 1103 are formed, and the corrugated lead plates 103 are stacked and bonded as shown in FIG.

[0006] Japanese Patent Application Laid-Open No. 7-301695 discloses that a large number of cylindrical honeycomb materials are laminated and fixed integrally.
There is disclosed a technology for manufacturing a collimator by cutting out all the honeycomb materials obliquely at a predetermined inclination angle from a side surface at the same angle.

Japanese Unexamined Patent Publication No. 9-257996 discloses a collimator in which a resin mold is formed by a method such as optical molding, a collimator material is filled in the resin mold, and after the collimator material is solidified, the resin mold is removed. Are disclosed.

[0008]

In the above-mentioned conventional method for manufacturing a collimator, there is a problem that it is difficult to individually manufacture a collimator having an arbitrary angle. That is, in a manufacturing method in which a resin mold is formed by a method such as stereolithography and filled with a collimator material, and then the resin mold is removed to manufacture a collimator, it takes a great deal of time and effort and productivity is low.

Therefore, it is not very practical to manufacture a collimator by these methods, and it is particularly suitable for a method of manufacturing a collimator that selectively takes in radiation from an arbitrary position in an arbitrary desired shape. Absent.

Accordingly, the present invention provides a manufacturing method capable of providing a collimator for a nuclear medicine diagnostic apparatus capable of selectively capturing radiation from a subject in a desired arbitrary shape in a desired arbitrary shape. It is intended to be.

[0011]

Means for Solving the Problems To solve the above problems and achieve the object, a method of manufacturing a gamma ray collimator, a gamma ray collimator, and a nuclear medicine diagnostic apparatus of the present invention are configured as follows.

(1) A through-hole forming step of providing through holes at predetermined positions of a plurality of shielding plates capable of shielding gamma rays, and the plurality of shielding plates are laminated at predetermined intervals and the shielding is provided in the arranged through holes. A holder arranging step of arranging a holder that transmits the gamma rays in at least a stacking direction of the shielding plates while maintaining a relative position of the through holes between the plates, and fixing the holder and the plurality of shielding plates And a step.

(2) The method of manufacturing a gamma ray collimator according to the above (1), wherein the holder is a cylindrical body made of a material capable of blocking the gamma rays.

(3) The method of manufacturing a gamma ray collimator according to the above (1), wherein the holder is a columnar body made of a thermosetting resin material through which the gamma rays can pass. I do.

(4) The method for manufacturing a gamma ray collimator according to the above (1), wherein the holder is a columnar body made of a thermosetting resin material through which the gamma rays can pass, and The plating is formed of a material capable of shielding gamma rays.

(5) The method for manufacturing a gamma ray collimator according to the above (1), wherein before the fixing step,
The method may further include a bending step of bending the shielding plate to a curvature corresponding to a position where the shielding plate is arranged.

(6) A step of forming a pilot hole at a predetermined position of a shielding plate made of a material capable of shielding gamma rays, and a shaving step of shaping the pilot hole into a predetermined shape by shaving. The feature.

(7) The method of manufacturing a gamma ray collimator according to the above (6), further comprising a bending step of bending the shielding plate to a predetermined curvature before the step of forming the pilot hole. Fine.

(8) The method for manufacturing a gamma ray collimator according to the above (6), wherein the shield plate has a plurality of shield thin plates, and after the pilot hole forming step, the plurality of shield thin plates are removed. It is characterized in that it comprises a bending step of bending to a curvature corresponding to the position where each is arranged, and a fixing step of fixing the plurality of shielding thin plates at predetermined relative positions.

(9) In a method for manufacturing a gamma ray collimator for extracting a gamma ray traveling in a predetermined collimating direction, a plurality of cylindrical bodies made of a material capable of shielding the gamma ray and having a direction in which the gamma ray is not shielded are formed by using the gamma ray. It is characterized in that it comprises a step of arranging a direction not to be shielded corresponding to the collimating direction, and a step of fixing the plurality of arranged cylindrical bodies.

(10) In a method of manufacturing a gamma ray collimator for extracting a gamma ray traveling in a predetermined collimating direction, the gamma ray is shielded in a hollow portion of a cylindrical body made of a material capable of shielding the gamma ray and having a direction in which the gamma ray is not shielded. A step of arranging a rod-shaped body constituted by arranging a solid body made of a material that does not block the gamma ray of the rod in a direction that does not block the gamma rays in accordance with the collimation direction, and And a fixing step for fixing.

(11) The method of manufacturing a gamma ray collimator according to the above (9) or (10), wherein in the fixing step, an adhesive containing a heavy metal is used.

(12) In a method of manufacturing a gamma ray collimator for extracting a gamma ray traveling in a predetermined collimating direction, a plurality of shielding plates made of a material capable of shielding gamma rays have the same shape as the cross section of the collimator in the collimating direction. Forming, and forming the surface of the shielding plate into irregularities in a direction intersecting with the collimating direction by press molding, and forming an outer surface of each of the shielding plates as viewed from the center in the thickness direction of the shielding plate. And a fixing step of laminating and fixing through the intermediary.

(13) The above (1) (6) (9) (10)
Wherein the outer shape of the collimator is formed into an arc shape by removing a surface of the formed collimator that intersects the collimating direction.

(14) It is characterized by being manufactured by the method for manufacturing a gamma ray collimator described in the above (1) to (13).

(15) A gamma ray collimator capable of shielding gamma rays and extracting gamma rays traveling in a predetermined collimating direction, wherein a member that does not shield the gamma rays is provided in the collimating direction. I do.

(16) A gamma ray detector provided with the collimator according to (14) or (15) detachably, receiving a gamma ray collimated by the collimator and generating an electric signal corresponding to the gamma ray. And a display device for processing the electric signal generated from the gamma ray detector and presenting information related to the gamma ray.

[0028]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a diagram showing an outline of a SPECT apparatus 1 having a rotary detector type configuration as an example of a nuclear medicine diagnostic apparatus. FIG. 2 shows a main detector 6, which will be described later.
FIG. 7 is a diagram viewed from above a normal line of a detection surface 7.

The SPECT apparatus 1 has a gantry 2, and two main detectors 6, 7 via arms 4, 5 are attached to a rotating plate 3 rotatably provided with respect to the gantry 2. The detection surface is supported in a state where the detection surface faces each other, and the subject is provided so as to be able to be arranged in a space sandwiched between the detection surfaces. The rotation of the rotating plate 3 allows the main detectors 6 and 7 to rotate around the subject P. A collimator 8 is provided on the gamma ray incidence side of the two main detectors 6 and 7 to limit the gamma ray incidence direction to a direction substantially perpendicular to the detection surface. The gantry 2 has a structure capable of moving in parallel to the body axis by moving on rails 2a and 2b provided along the body axis of the subject.

In such a nuclear medicine diagnostic apparatus, as described above, a radioisotope (RI) is administered to a subject such as a patient, and radiation such as gamma rays emitted from the subject is detected to know the RI distribution in the subject. Therefore, a radiation detector composed of a photomultiplier tube or a semiconductor is arranged one-dimensionally or two-dimensionally to measure the RI distribution.

Usually, this RI distribution is measured by selectively transmitting a gamma ray emitted from a radioisotope administered to a subject to form a gamma ray flux having a uniform radiation direction, and converting only a gamma ray from a specific direction. Detection is performed to improve the position accuracy of the detection. For this reason, it is common practice to attach a component called a collimator immediately before the detector. The collimator is a gamma ray
It has a function of passing only gamma rays traveling from a predetermined direction (collimating direction). The gamma ray transmitted through the collimator is converted into light by a scintillator, further converted into an electric signal, and finally converted into image data.

FIGS. 2A and 2B are views showing an example of the collimator 8. FIG. That is, the collimator 8 is configured by arranging a large number of parallel through holes 9a, 9b, 9c,..., Which are transmissive portions that transmit gamma rays, on a lead plate that serves as a substrate that blocks gamma rays. In particular, the through holes 9a,
9b, 9c,... Are all arranged in parallel as shown in the sectional view of FIG. The through holes 9a, 9b, 9
In many cases, c,... employ hexagonal holes that can be densely arranged.

FIGS. 3A and 3B are explanatory views showing the positional relationship between the configuration of the radiation semiconductor detectors 10 and 50 incorporated in the nuclear medicine diagnostic apparatus and the subject P. FIG.

As shown in FIG. 3A, the radiation semiconductor detector 10 has a plurality of semiconductor cells for detecting radiation such as gamma rays emitted from a subject P such as a patient.
A semiconductor detector array 11 that is concave and curved with respect to the subject P side, and a collimator 12 disposed on the subject P side of the semiconductor detector array 11 and provided along the detection surface of the semiconductor detector array 11 And is constituted by. The incident sides of the semiconductor detector array 11 and the collimator 12 are both arranged toward a predetermined position of the subject P. The collimator 12 allows the gamma rays incident from a predetermined portion of the subject P to pass therethrough, and
1 is formed.

Each semiconductor cell of the semiconductor detector array 11 is made of a cadmium telluride (CdTe) semiconductor. In this semiconductor, a high voltage electrode and a signal extraction electrode are arranged. The high voltage supply electrode is used to apply a high voltage to the semiconductor, and the signal extraction electrode is used to extract a detection signal from the semiconductor.

The semiconductor detector array 11 employs a structure in which the thickness of the electrode portion (high-voltage electrode and signal extraction electrode) on the detection surface is smaller than the thickness of the semiconductor cell portion, and provides a dead zone (gamma ray detection). Part that does not contribute to
Is the sensitive zone (contributes to gamma ray detection)
Is formed so as to be approximately 1/10 or less of the semiconductor cell portion.

In order to make the detection surface of the radiation semiconductor detector 10 as close as possible to the subject P at any position, the width of the observation field of the radiation semiconductor detector 10 must be 50 cm depending on the shape of the subject. It is desirable to set it within the range of 10 cm to 12 cm PV on the surface facing the subject. Thereby, the radiation semiconductor detector 10
Is also close to the subject P, it is possible to greatly improve the positional resolution. If the radiation semiconductor detector 10 composed of the collimator 12 and the semiconductor detector array 11 configured as described above is used for a nuclear medicine diagnostic apparatus, the distance between the detector and the subject is reduced because the collimator is arranged in a predetermined curve. The size can be reduced, and the detection sensitivity can be improved.

On the other hand, as shown in FIG. 3B, in the radiation semiconductor detector 50, each semiconductor cell of the semiconductor detector array 51 is arranged toward a predetermined position of the subject P. The collimator 52 allows the gamma rays incident from a predetermined portion of the subject P to pass therethrough, and
It is formed to lead to. In addition, the semiconductor detector array 51 and the collimator 52 are
Optimum detectability at the center, that is, the detector at the center can precisely observe the vicinity of the affected area, and the detectors at both ends can acquire images of the entire subject. It is formed so as to spread out. That is, since the direction of the through-hole of the collimator 52 is arranged not to be perpendicular to the surface of the collimator 52 but to aim at a specific direction, it is possible to obtain a wide-range image and to improve the detection resolution of a specific portion. Can be.

Next, a method of manufacturing the collimators 12, 52 incorporated in the radiation semiconductor detectors 10, 50 will be described.

FIG. 4 is a process chart showing a method of manufacturing a collimator according to the first embodiment of the present invention, and FIGS.
(B) is an explanatory view showing the same manufacturing method.

The collimator 12 is manufactured as shown in FIG. That is, the hexagonal holes 14 are provided with a predetermined pitch (unequal pitch) in each of the stainless steel shielding plates (holding bodies) 13a to 13c used as the guide plates.
And using an NC turret punch press or the like (S1). In addition, since the shielding plates 13a to 13c are curved in a predetermined shape in a later process, and are assembled by being stacked with different curvatures, the orientation and position of the hexagonal hole 14 are determined in advance by assembling. Calculated and set.

Next, the shielding plates 13a to 13c each having the hexagonal holes 14 are bent to a predetermined curvature in accordance with the shape of the collimator 12 (S2). The shield plates 13a to 13c after being curved are arranged at a predetermined interval in a predetermined order,
The cylindrical bodies 15a, 15b, 15c, which fit into the hexagonal holes 14,
Are inserted and penetrated (S3). The cylindrical members 15a, 1
Reference numerals 5b, 15c, ... denote hexagonal cylinders made of lead material manufactured by extrusion or the like.

Next, the cylindrical members 15a, 15b, 15c,.
And the shielding plates 13a to 13c are bonded and fixed with an adhesive (S4). It is preferable to use an adhesive mixed with a powder of a heavy metal such as tungsten so that the absorption of gamma rays is good.

On the other hand, the collimator 52 is manufactured as shown in FIG. That is, also in this case, the shielding plates 13a to 13a to 1 are adjusted according to the final shape of the collimator 52.
After the hexagonal hole 14 is formed in 3c, the cylindrical bodies 15a, 15
, 15c,... are inserted and adhesively fixed.

As described above, according to the method for manufacturing a collimator according to the first embodiment, a collimator for focusing a gamma ray from a subject P to an arbitrary position in an arbitrary shape can be easily manufactured in a short time. And increase productivity. Accordingly, assembling accuracy can be increased, and a more accurate image can be obtained. That is, for example, the central detector detects the vicinity of the affected part precisely, and the detectors at both ends acquire images of the entire subject, such as selectively capturing radiation from any position in a desired arbitrary shape. It is suitable for the manufacturing method of the collimator in the case where

FIG. 6 is a process chart showing a method of manufacturing a collimator according to a second embodiment of the present invention, and FIGS.
(B) is an explanatory view showing the same manufacturing method. In FIG. 7, the same reference numerals are given to the same functional portions as those in FIG.

The collimator 12 is manufactured as shown in FIG. That is, hexagonal holes 14 are provided in each of stainless steel shielding plates 13a to 13c used as guide plates.
Are formed at a predetermined pitch (unequal pitch) using an NC turret punch press or the like (S6). In addition, since the shielding plates 13a to 13c are curved in a predetermined shape in a later process, and are assembled by being stacked with different curvatures, the orientation and position of the hexagonal hole 14 are determined in advance by assembling. Calculated and set.

Next, the shielding plates 13a to 13c each having the hexagonal holes 14 are bent to a predetermined curvature in accordance with the shape of the collimator 12 (S7). The curved shield plates 13a to 13c are aligned at a predetermined interval in a predetermined order, and are fitted in the hexagonal holes 14 to form the prismatic bodies 16a,
16b, 16c,... Are inserted (S8). Prism 16
a, 16b, 16c,... are hexagonal columns made of a thermosetting resin.

Next, the shielding plates 13a to 13c are
Lead is cast in a state where 6a, 16b, 16c,... Are inserted (S9). Thereby, the prism 16 of thermosetting resin oriented in a predetermined direction in the lead in the shape of a collimator is formed.
a, 16b, 16c,... are formed.

From this structure, the prisms 16a, 16b,
When the collimators 12 are removed, the collimator 12 is completed. .. Can be transmitted through the prisms 16a, 16b, 16c,.
a, 16b, 16c,... can function as the collimator 12 even when used as cast without being removed. Further, if Sn, Cd, etc. are mixed with lead, the melting point can be lowered as necessary, and the heat load on the prismatic bodies 16a, 16b, 16c,... The shape accuracy of the passage area is improved.

On the other hand, the collimator 52 is manufactured as shown in FIG. That is, the final collimator 5
Hexagonal holes 14 in the shielding plates 13a to 13c according to the shape of FIG.
Are formed, the prisms 16a, 16b, 16c,... Are inserted and cast with lead to manufacture the collimator 52.

In the method of manufacturing the collimator according to the second embodiment, the same effects as those of the method of manufacturing the collimator according to the first embodiment can be obtained.

FIG. 8 is a process chart showing a method of manufacturing a collimator according to a third embodiment of the present invention, and FIG. 9 is an explanatory view showing the same manufacturing method. In FIG. 9, the same reference numerals are given to the same functional portions as in FIG. 5, and the detailed description thereof will be omitted.

The collimator 12 is manufactured as shown in FIG. That is, hexagonal holes 14 are formed in each of the stainless steel shielding plates 13a to 13c used as guide plates at a predetermined pitch (unequal pitch) using an NC turret punch press or the like (S11).
In addition, since the shielding plates 13a to 13c are curved into a predetermined shape in a later process, and are laminated and assembled with different curvatures, the direction and the position of the hexagonal hole 14 are the directions and the positions after the assembly.
The position is calculated and set in advance.

Next, the shielding plates 13a to 13c each having a hexagonal hole are bent to a predetermined curvature according to the shape of the collimator 12 (S12). The curved shielding plates 13a to 13c are arranged at a predetermined interval in a predetermined order, and hexagonal prisms 16a, 16b, 16c,... Made of a thermosetting resin fitted into hexagonal holes are inserted. (S13). Each of the prisms 16a, 16b, 16c,... Is a hexagonal prism made of a thermosetting resin.

Next, the prisms 16a, 16b, 16
The surfaces of c,... are plated with lead until the surface has a predetermined thickness sufficient to shield gamma rays (S14). It is preferable that the surface of the thermosetting resin prisms 16a, 16b, 16c,... Is previously subjected to a surface treatment for a base so that plating can be easily performed. Furthermore, after plating, it is preferable to fill and fix an empty space with an adhesive or a foaming agent mixed with a powder of a heavy metal such as tungsten to improve absorption of gamma rays (S15). If shielding is sufficient with lead plating alone,
This filling step may not be necessary, but may be filled with a general adhesive or foaming agent to reinforce the mechanical strength. Thereby, the collimator 12 can be manufactured.

On the other hand, the collimator 52 is manufactured as shown in FIG. That is, the final collimator 5
Hexagonal holes 14 in the shielding plates 13a to 13c according to the shape of FIG.
Are formed, the prisms 16a, 16b, 16c,... Are inserted and plated with lead to manufacture the collimator 52.

In the method of manufacturing the collimator according to the third embodiment, the same effects as those of the method of manufacturing the collimator according to the above-described first embodiment can be obtained.

FIG. 10 is a process chart showing a method for manufacturing a collimator according to a fourth embodiment of the present invention, and FIG. 11 is an explanatory view showing the same manufacturing method.

The lead plate 20 is bent into a predetermined shape corresponding to the shapes of the collimators 12 and 52 (S17). Next, lead plate 2
A predetermined hole (not shown) is formed at a predetermined position in a predetermined direction by a drill of a machining center (S1).
8). Subsequently, these pilot holes are formed into hexagonal holes 21 by shaving (S19). In addition, in order to facilitate shaving, the diameter of the prepared hole is preferably a dimension inscribed in a hexagon.

In the method of manufacturing the collimator according to the fourth embodiment, the same effects as those of the method of manufacturing the collimator according to the first embodiment can be obtained.

FIG. 12 is a process chart showing a method of manufacturing a collimator according to a fifth embodiment of the present invention, and FIG. 13 is an explanatory view showing the same manufacturing method.

The three thin lead plates 22a to 22c are bent into a predetermined shape corresponding to the shapes of the collimators 12, 52 (S
21). Next, a pilot hole in a predetermined direction is formed in a predetermined position in the predetermined position by a drill of a machining center (S22). Subsequently, each of the pilot holes is formed into a hexagonal hole 23 by shaving (S23). In addition, in order to facilitate shaving, the diameter of the prepared hole is preferably a dimension inscribed in a hexagon.

The thin lead plates 22a to 22c are aligned and fixed at predetermined intervals in a laminated state (S24). Thereby, the collimators 12 and 52 are manufactured.

According to the method of manufacturing the collimator according to the fifth embodiment, the same effects as those of the method of manufacturing the collimator according to the above-described first embodiment can be obtained. Since the light can be shielded on a surface substantially parallel to the detection surface of the detector, the generation of disturbance signals due to the scattering of gamma rays by the wall of the hexagonal hole 23 is small.

FIG. 14 is a process chart showing a method of manufacturing the collimators 12 and 52 according to the sixth embodiment of the present invention.
Is an explanatory view showing the same manufacturing method.

Hex holes 25a, 25b are formed in the lead plates 24a, 24b at a predetermined pitch using an NC turret punch press or the like (S26). Since the lead plates 24a and 24b are bent into a predetermined shape in a later process and are assembled by being laminated with different curvatures, the orientation and position of the hexagonal holes 25a and 25b are the orientation and position after assembly. Is calculated and set in advance.

Next, the lead plates 24a and 24b are each bent to a predetermined curvature in accordance with the shape of the collimator 12 (S
27). The curved lead plates 24a, 24b are arranged at predetermined intervals in a predetermined order and laminated (S28), and further fixed with an adhesive or the like (S29), whereby the collimators 12, 52 are manufactured.

In the method of manufacturing the collimator according to the sixth embodiment, the same effects as those of the method of manufacturing the collimator according to the first embodiment can be obtained.

FIG. 16 is a process chart showing a method of manufacturing a collimator according to a seventh embodiment of the present invention, and FIG. 17 is an explanatory view showing the same manufacturing method.

The hexagonal holes 27 are formed in the thin lead plates 26a to 26c.
a, 27b, and 27c are formed at a predetermined pitch using an NC turret punch press or the like (S31). In addition,
Each lead plate 26a to 26c is curved into a predetermined shape in a later process,
In addition, since they are assembled by being stacked with different curvatures, the orientations and positions of the hexagonal holes 27a, 27b, 27c are set by calculating the orientations and positions after assembly in advance.

Next, the lead plates 26a to 26c are bent to a predetermined curvature according to the shapes of the collimators 12 and 52, respectively (S32). Next, the lead plates 26a to 26c are aligned at a predetermined interval in a predetermined order, and are fixed and fixed with an adhesive or the like (S33). The gap between the lead plates 26a to 26c is formed by an adhesive layer, a filler, or the like.

In the method of manufacturing the collimator according to the seventh embodiment, the same effects as those of the method of manufacturing the collimator according to the above-described first embodiment can be obtained.

FIG. 18 is a process chart showing a method of manufacturing a collimator according to an eighth embodiment of the present invention, and FIGS. 19 and 20.
Is an explanatory view showing the same manufacturing method.

The collimator 12 is manufactured as shown in FIG. That is, the hexagonal oblique pillar-shaped cylindrical body 3 made of lead material
.. Are manufactured by extruding backward. The shapes of the cylindrical bodies 30a, 30b, 30c,...
are formed at positions where b, 30c,... are arranged.

Next, these cylindrical bodies 30a, 30b, 3
0c,... Are arranged at predetermined positions and arranged in combination (S3
5). The cylindrical bodies are adhered to each other and fixed in a state where they are arranged in combination (S36). The fixed tubular body 30a,
The assembly of 30b, 30c,... Is cut out into the shape of the collimator 12 to manufacture the collimator 12 (S37).

In this case, if a material that does not substantially block gamma rays, such as a thermosetting resin, is used even if a solid rod is used instead of a hollow cylindrical body,
Similar effects can be obtained.

On the other hand, the collimator 52 is manufactured as shown in FIG. That is, after fixing the cylindrical bodies 30a, 30b, 30c,... According to the final shape of the collimator 52, the collimator 52 is cut out into the shape of the collimator 52 to manufacture the collimator 52.

In the method of manufacturing the collimator according to the eighth embodiment, the same effects as those of the method of manufacturing the collimator according to the first embodiment can be obtained.

FIG. 21 is a process chart showing a method of manufacturing a collimator according to a ninth embodiment of the present invention.
(B) is an explanatory view showing the same manufacturing method.

The collimator 12 is manufactured as shown in FIG. That is, 40 in FIG. 22 indicates a jig for assembling the collimator. The jig 40 is configured by assembling stainless steel plates 41a and 41b separated in a predetermined distance in parallel, and a hexagonal column (not shown) formed in a predetermined position of each of the stainless steel plates 41a and 41b has a hexagonal column. Each of the lead-shaped cylindrical members 42a, 42b, 42c,... Is inserted (S41). The positions of the hexagonal holes formed in the stainless plates 41a and 41b of the jig 40 are shown in FIG.
(A) is set in accordance with the shape of the collimator 12.

Next, the whole is fixed with an adhesive or a foaming agent (S42). After the fixing is completed, the collimator 12 is cut out into a predetermined shape to manufacture the collimator 12 (S4).
3).

On the other hand, the collimator 52 is shown in FIG.
It is manufactured as shown in FIG. That is, the cylindrical bodies 42a, 42b, 42c,... Are fixed using the jig 40 and cut out into a predetermined shape to manufacture the collimator 52.

In the method of manufacturing the collimator according to the ninth embodiment, the same effects as those of the method of manufacturing the collimator according to the above-described first embodiment can be obtained.

FIG. 23 is a process chart showing a method of manufacturing a collimator according to the tenth embodiment of the present invention, and FIGS. 24 (a) and (b) are explanatory views showing the same manufacturing method.

The shielding plate (lead plate) 45 is formed into a fan shape with a central portion cut out as shown in FIG. 24A according to the final shape of the collimators 12 and 52 (S45). Next, the shielding plate 45 is pressed in a predetermined direction with a hexagonal column-shaped half-shaped press die to manufacture a corrugated plate 46 having irregularities formed by a hexagonal half-shaped shape (S46). Further, as shown in FIG. 24 (b), a plurality of corrugated plates 46 having irregularities formed thereon are laminated, and a convex 47 and a concave 48 on the other side are laminated.
Are aligned so as to contact each other to form a hexagonal hole group (S47). The lamination point where the hexagonal holes are formed is bonded and fixed to manufacture a collimator (S48).

In the method of manufacturing the collimator according to the tenth embodiment, the same effects as those of the method of manufacturing the collimator according to the first embodiment can be obtained.

As described above, the method of manufacturing the collimator according to each of the above embodiments can be appropriately selected according to the available production equipment and business environment.

The present invention is not limited to the above embodiments. That is, in the above-described embodiment, for those in which a collimator is manufactured by laminating plates of heavy metals such as lead materials, the transmission energy of gamma rays is adjusted by changing the number of layers or the plate thickness. It may be.

Instead of the shaving process described above, a hexagonal punch may be inserted into the pilot hole, and the hexagonal hole may be formed by plastic working. In this case, it is preferable to process the hexagonal hole with a hexagonal prism-shaped spacer inserted in order to prevent the processed hexagonal hole from being deformed during plastic working of the unprocessed hole.

In shaving or plastic working,
There is a limit to the thickness of the lead plate that can be processed, so if a thick collimator is required, process multiple lead plates,
The layers may be laminated so as to have a desired thickness.

In addition, it goes without saying that various modifications can be made without departing from the spirit of the present invention.

[0093]

According to the present invention, a collimator for focusing radiation from a subject to an arbitrary position in an arbitrary shape can be easily manufactured in a short time, and productivity can be improved. Along with this, the assembling accuracy can be increased, and a more accurate image can be obtained.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of a SPECT apparatus having a rotary detector type configuration.

2A is a plan view of a collimator, and FIG. 2B is a side view of the collimator.

FIG. 3 is an explanatory diagram showing a positional relationship between a radiation semiconductor detector incorporated in a nuclear medicine diagnostic apparatus and a subject.

FIG. 4 is a process chart showing a method of manufacturing the collimator according to the first embodiment of the present invention.

FIG. 5 is an explanatory view showing the manufacturing method.

FIG. 6 is a process chart showing a collimator manufacturing method according to a second embodiment of the present invention.

FIG. 7 is an explanatory view showing the same manufacturing method.

FIG. 8 is a process chart showing a method for manufacturing a collimator according to a third embodiment of the present invention.

FIG. 9 is an explanatory view showing the manufacturing method.

FIG. 10 is a process chart showing a method for manufacturing a collimator according to a fourth embodiment of the present invention.

FIG. 11 is an explanatory view showing the same manufacturing method.

FIG. 12 is a process chart showing a method for manufacturing a collimator according to a fifth embodiment of the present invention.

FIG. 13 is an explanatory view showing the same manufacturing method.

FIG. 14 is a process chart showing a collimator manufacturing method according to a sixth embodiment of the present invention.

FIG. 15 is an explanatory view showing the manufacturing method.

FIG. 16 is a process chart showing a collimator manufacturing method according to a seventh embodiment of the present invention.

FIG. 17 is an explanatory view showing the same manufacturing method.

FIG. 18 is a process chart showing a collimator manufacturing method according to an eighth embodiment of the present invention.

FIG. 19 is an explanatory view showing the same manufacturing method.

FIG. 20 is an explanatory view showing the same manufacturing method.

FIG. 21 is a process chart showing a collimator manufacturing method according to a ninth embodiment of the present invention.

FIG. 22 is an explanatory view showing the same manufacturing method.

FIG. 23 is a process chart showing a collimator manufacturing method according to a tenth embodiment of the present invention.

FIG. 24 is an explanatory view showing the same manufacturing method.

FIG. 25 is an explanatory view of manufacturing a corrugated corrugated sheet by a roll.

FIG. 26 is a perspective view of a collimator formed by combining corrugated plates.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... SPECT apparatus 10, 50 ... Radiation semiconductor detector 11, 51 ... Semiconductor detector array 12, 52 ... Collimator 13a-13c, 45, 46 ... Shielding plate 14, 21, 25a, 25b, 27a-27c ... Hexagon hole 15a , 15b, 15c, 30a to 30c, 42a to 4
2c: cylindrical body 16a, 16b, 16c: prismatic body 20, 22a to 22c, 24a, 24b, 26a to 26
c: Lead plate 40: Jig 41a, 41b: Stainless steel plate

Claims (16)

[Claims] 1. A through-hole forming step of providing through holes at predetermined positions of a plurality of shielding plates capable of shielding gamma rays, and the plurality of shielding plates are laminated at a predetermined interval, and the shielding plates are arranged in the arranged through holes. A holder arranging step of holding a relative position of the through holes with each other and arranging a holder that transmits the gamma rays at least in a stacking direction of the shielding plates; and a fixing step of fixing the holding members and the plurality of shielding plates. And a method for manufacturing a gamma ray collimator. 2. The method for manufacturing a gamma ray collimator according to claim 1, wherein said holding body is a cylindrical body made of a material capable of blocking said gamma rays. 3. The method for manufacturing a gamma ray collimator according to claim 1, wherein said holding body is a columnar body made of a thermosetting resin material through which said gamma rays can pass. 4. The holding member is a columnar member made of a thermosetting resin material through which the gamma rays can pass, and is formed by plating with a material capable of blocking the gamma rays. Item 3. A method for producing a gamma ray collimator according to Item 1. 5. The method for manufacturing a gamma ray collimator according to claim 1, further comprising a bending step of bending the shielding plate to a curvature corresponding to a position where the shielding plate is arranged before the fixing step. 6. A step of forming a pilot hole at a predetermined position of a shielding plate made of a material capable of shielding gamma rays, and a shaving step of shaping the pilot hole into a predetermined shape by shaving processing. A special method of manufacturing a collimator for gamma rays. 7. The method of manufacturing a gamma ray collimator according to claim 6, further comprising a bending step of bending the shielding plate to a predetermined curvature before the step of forming the pilot hole. 8. The shielding plate has a plurality of shielding thin plates, and after the pilot hole forming step, a bending step of bending the plurality of shielding thin plates to a curvature corresponding to a position where each of the shielding thin plates is arranged; 7. The method for manufacturing a gamma ray collimator according to claim 6, further comprising a fixing step of fixing the thin plate at a predetermined relative position. 9. A method for manufacturing a gamma ray collimator for extracting a gamma ray traveling in a predetermined collimating direction, comprising: a plurality of cylindrical bodies made of a material capable of shielding the gamma ray and having a direction in which the gamma ray is not shielded. A method for manufacturing a gamma ray collimator, comprising: arranging a direction not to correspond to the collimating direction; and fixing the arranged plurality of cylindrical bodies. 10. A method for manufacturing a gamma ray collimator for extracting a gamma ray traveling in a predetermined collimating direction, wherein the gamma ray is not shielded in a hollow portion of a cylindrical body made of a material capable of shielding the gamma ray and having a direction in which the gamma ray is not shielded. A rod-like body consisting of a solid body made of material
A gamma ray collimator comprising: a step of arranging a direction in which the gamma rays of the rod-shaped body are not shielded so as to correspond to the collimation direction; and a fixing step of fixing the plurality of arranged cylindrical bodies. Production method. 11. The fixing step according to claim 9, wherein an adhesive containing a heavy metal is used.
0. A method for manufacturing a gamma ray collimator according to item 0. 12. A method for manufacturing a gamma ray collimator for extracting a gamma ray traveling in a predetermined collimating direction, wherein a plurality of shielding plates made of a material capable of shielding gamma rays are formed into the same shape as the cross section of the collimator in the collimating direction. And forming the surface of the shielding plate into irregularities in a direction intersecting with the collimating direction by press molding, and forming each of the shielding plates through an outer surface when viewed from the center in the thickness direction of the shielding plate. A method of manufacturing a gamma ray collimator, comprising: 13. An outer shape of the collimator is formed in an arc shape by removing a surface of the formed collimator that intersects with the collimating direction.
The method for producing a gamma ray collimator according to any one of claims 9 and 10. 14. A gamma ray collimator manufactured by the method for manufacturing a gamma ray collimator according to claim 1. 15. A gamma ray collimator capable of shielding gamma rays and extracting gamma rays traveling in a predetermined collimating direction, wherein a member that does not shield the gamma rays is provided in the collimating direction. Gamma ray collimator. 16. A gamma ray detector provided with the collimator according to claim 14 or 15 detachably, receiving a gamma ray collimated by the collimator and generating an electric signal corresponding to the gamma ray, and a gamma ray detector. A display device for processing the electric signal generated from the display device and presenting information related to the gamma ray.