WO2006038386A1

WO2006038386A1 - Probe for detecting radioactive isotope and method for detecting radioactive isotope

Info

Publication number: WO2006038386A1
Application number: PCT/JP2005/015094
Authority: WO
Inventors: Kunihide Nishizawa; Takuya Sase; Shigeki Ito
Original assignee: National University Corporation Nagoya University
Priority date: 2004-10-04
Filing date: 2005-08-18
Publication date: 2006-04-13
Also published as: JPWO2006038386A1; JP4882070B2

Abstract

A probe (1) for detecting radioactive isotope being used to obtain the radiation images of 123I and 131I accumulated at the thyroid gland (predetermined organ) of a subject S. The probe (1) for detecting radioactive isotope comprises a fastening band (5) arranged to be fixed to the neck (3), by being wound around the neck (predetermined part) of the subject S, and a radiation image forming unit (7) fixed remavably to the vicinity of the center of the fastening band (5). The radiation image forming unit (7) is made by inserting a radiation image transformation plate (13) containing stimulable phosphor into a visible light shielding bag (15) and then inserting the light shielding bag (15) into a cloth bag (serving as a shock absorber) (17).

Description

Specification

Radioisotope detection probe and radioisotope detection method

The present invention relates to a radioisotope detection probe and a radioisotope detection method.

Background art

[0002] Radioisotopes are widely used in research, education, industry, medicine, and the like.

For example, it is used for various medical diagnoses. Also, if an operator uses a radioisotope in the wrong way, it may be ingested and cause body contamination. For example, when radioactive iodine is used, the ingested radioactive iodine accumulates in the thyroid gland and causes the thyroid gland to be exposed.

In nuclear medicine examinations, examinations using scintillation detectors and scintillation cameras (scintillation cameras, gamma cameras) are performed to examine the intake and distribution of radioactive isotopes in patients (for example, see Patent Document 1). ).

[0003] However, in an examination using a scintillation camera, patients and the like had the power to go to hospitals and universities and measure the amount of accumulated radioisotopes with a scintillation camera. For this reason, for example, when the patient is at home, it has been difficult to measure the accumulated amount of radioisotope.

Patent Document 1: Japanese Patent Laid-Open No. 7-333344

Disclosure of the invention

Problems to be solved by the invention

On the other hand, a method using a radiation image conversion plate containing a stimulable phosphor instead of a scintillation camera has been devised. The radiation image conversion plate is a two-dimensional radiation detection medium that replaces the X-ray film, and is used in a system combined with a dedicated image analyzer.

[0005] However, the sensitivity of the conventional method of using a radiation image conversion plate is so high! For this reason, the relative position between the subject and the radiation image conversion plate is likely to change during the formation of a latent image with a long exposure time, and the image may be blurred.

The present invention has been made in view of the above circumstances, and includes a radiation image conversion plate containing a photostimulable phosphor, a radioisotope detection probe for obtaining a clear image with high sensitivity, and a radioisotope An object is to provide a detection method.

Means for solving the problem

[0006] As means for achieving the above object, the invention of claim 1 is a radioisotope detection probe for obtaining a radiographic image of a radioisotope existing in a predetermined organ of a subject. A fixture that can be fixed to a predetermined part of the subject, a light-shielding bag that is supported and fixed to the fixture and shields visible light, and is inserted into the light-shielding bag and contains a stimulable phosphor. A radioisotope detection probe comprising a radiation image conversion plate.

[0007] The invention of claim 2 is the invention of claim 1, wherein the surface of the light shielding bag facing the predetermined portion is on the surface of the radiation image conversion plate. It is characterized by a lead-containing collimator provided with a plurality of through holes penetrating in the intersecting direction.

[0008] The invention of claim 3 is the invention of claim 1, characterized in that the side of the light shielding bag facing the predetermined portion is covered with a cushioning material. .

[0009] The invention according to claim 4 is the invention according to claim 2 or claim 3, wherein the side of the collimator facing the predetermined portion is covered with a cushioning material. It is characterized by that.

[0010] The invention of claim 5 is the apparatus of any one of claims 1 to 4, wherein the light shielding bag is configured to be detachable from the fixture. It is characterized by this.

[0011] The invention of claim 6 is a radioisotope detection method for obtaining a radioisotope radiation image present in a predetermined organ of a subject, and a radiographic image containing a stimulable phosphor A fixing step of fixing the conversion plate to a predetermined part of the subject in a state where the conversion plate is shielded by a light shielding member that shields visible light, and the fixed radiation image conversion plate is left for a predetermined time. Thus, a latent image forming step of forming a latent image on the radiation image conversion plate and an analyzing step of analyzing the formed latent image to obtain the radiation image are characterized.

The invention's effect

The probe for detecting a radioisotope of the invention of the present invention is used as follows. That is, first, a fixture having a light-shielding bag into which a radiation image conversion plate is inserted is supported and fixed to a predetermined part (eg, neck) of a subject. In this state, when waiting for a predetermined time to elapse, a latent image is formed on the radiation image conversion plate. After the latent image is formed, the radiation image conversion plate is taken out from the light shielding bag in the dark room, and an image is obtained by a dedicated image analysis device.

[0013] According to the radioisotope detection probe of the present invention, the radioisotope detection probe is fixed to a predetermined part of the human body while the latent image is formed. The relative position of the part does not change, and as a result, the image is not blurred and a clear image is obtained.

Further, since the radiation image conversion plate is placed in a light shielding bag, the formed latent image is not erased by visible light.

[0014] <Invention of Claim 2>

According to the invention of this claim, since the lead-containing collimator provided with a plurality of through holes penetrating in the direction intersecting the plane of the radiation image conversion plate is provided, the radiation in this direction is selective. And the resolution of the latent image formed on the radiation image conversion plate is improved.

[0015] <Invention of Claim 3>

According to the invention of the present claims, the side of the fixture facing the predetermined part is covered with the cushioning material, so there is no risk of damaging the predetermined part with the fixture.

According to the invention of this claim, since the side facing the predetermined part of the collimator is covered with the cushioning material, there is no possibility that the predetermined part is damaged by the collimator.

<0017> <Invention of Claim 5>

According to the invention of this claim, the light shielding bag is configured to be detachable from the fixture. It is convenient to carry it by removing the light shielding bag with the radiation image conversion plate inserted and carrying it to the darkroom for analysis.

Brief Description of Drawings

FIG. 1 is a plan view of a radioisotope detection probe according to a first embodiment.

[Fig. 2] Fig. 2 is a cross-sectional view of the probe for detecting a radioisotope (A-A cross-sectional view of Fig. 1).

FIG. 3 is an exploded plan view of a probe for detecting radioisotopes.

FIG. 4 is a perspective view of the radiation image forming unit as seen from the front side and a perspective view from the back side.

FIG. 5 is a perspective view showing a light shielding bag and a radiation image conversion plate.

[Fig. 6] Fig. 6 is a perspective view showing a state in which a radioactive isotope detection probe is attached to the neck.

FIG. 7 is a perspective view of the radioactive isotope detection probe of the second embodiment.

FIG. 8 is a cross-sectional view of FIG.

FIG. 9 is an exploded perspective view of a radioactive isotope detection probe.

FIG. 10 is a plan view of the collimator ((A); collimator A, (B); collimator B, (C) collimator C).

FIG. 11 is a perspective view showing a state in which a radioactive isotope detection probe is attached to the neck.

FIG. 12 is a schematic perspective view of a neck-thyroid model in the example.

[Fig.13] Figure 13 shows images when using each radioisotope detection probe ((A); using radioisotope detection probe A, (B); using radioisotope detection probe B, (C): When using radioisotope detection probe C, (D): When using radioisotope detection probe D).

FIG. 14 is a perspective view of a radioisotope detection probe of a third embodiment.

[FIG. 15] FIG. 15 is a partially enlarged perspective view showing a state in which the radiation image converting plate breastplate portion housed in the light shielding bag is housed.

[FIG. 16] FIG. 16 shows a radioisotope detection probe mounted on the body of a subject. FIG.

Explanation of symbols

[0019] 1 ... Radioisotope detection probe

3 ... Neck (predetermined part)

5 ... Fixing tool

7. Radiation imaging unit

13 ··· Radiation image converter

15 ... Shading bag

17… Cloth bag (buffer material)

BEST MODE FOR CARRYING OUT THE INVENTION

[0020] <First embodiment>

A first embodiment of the present invention will be described with reference to FIGS. The radioactive isotope detection probe 1 of this embodiment is for accumulating in a subject's thyroid gland (corresponding to a predetermined organ) to obtain radiation images of V, ¹² and ¹³¹ 1. This radioisotope detection probe 1 is formed in a curved belt shape as a whole, and has a fixture 5 configured to be fixed to the neck 3 by being wound around the neck 3 (corresponding to a predetermined site) of the subject. The radiographic image forming unit 7 is detachably mounted near the center of the fixture 5.

[0021] The fixture 5 is made of a soft synthetic resin such as a foamed urethane resin having a curved band as a whole, and corresponds to the length of the neck 3 wound around the neck 3 and the length of the neck 3. Width. A band 9 having a hook and loop fastener 9A is attached to one end of the fixture 5, and a hook and loop fastener 11 that can be engaged with the hook and loop fastener 9A of the band 9 is attached near the other end of the fixture 5. It is The fastener 5 is fixed to the neck 3 by engaging the fasteners 9A and 11 on the surface in a state of being wound around the neck 3.

[0022] The radiation image forming unit 7 has a curved belt shape as a whole, is approximately 1Z3 in length of the fixture 5, and is approximately the same width as the fixture 5. A hook-and-loop fastener 7A is provided at this location, and the hook-and-loop fastener 7A is engaged with and fixed to the hook-and-loop fastener 5A provided on the surface of the fixture 5. In detail, the radiation image forming unit 7 includes a light shielding bag 15 for blocking visible light from a radiation image conversion plate 13 containing a stimulable phosphor as shown in FIG. As shown in FIG. 4, a light shielding bag 15 is further inserted into a cloth bag 17 (corresponding to the cushioning material of the present invention).

[0023] As the radiation image conversion plate 13, for example, a product name: Imaging Plate manufactured by Fuji Photo Film Co., Ltd. can be used. The light shielding bag 15 is for preventing the latent image formed on the radiation image conversion plate 13 from being erased by visible light. For example, the light shielding bag 15 having a material strength obtained by laminating aluminum on polyethylene is used. Can be used. The cloth bag 17 preferably has a soft material on the surface so that the skin of the neck 3 of the subject is not damaged.

Next, the function and effect of the radioactive element detection probe 1 of the present embodiment configured as described above will be described.

First, the radiation image conversion plate 13 containing the stimulable phosphor is inserted into the light shielding bag 15, and the light shielding bag 15 is further inserted into the cloth bag 17 to form the radiation image forming unit 7. The radiographic image forming unit 7 is attached to the fixture 5 to form a radioisotope detection probe 1, and the radioisotope detection probe 1 faces the throat side of the neck 3 of the subject. In this way, fix it to the neck 3 (see Fig. 6). In this way, the thyroid gland and the radiation image conversion plate 13 face each other, and a latent image is formed on the radiation image conversion plate 13.

[0025] Next, it waits for a predetermined time, for example, 3 to 20 minutes to pass in the fixed state. During this waiting time, the subject can freely change his / her posture and can walk and work. This is because fixing the radioisotope detection probe 1 to the neck 3 does not change the relative position between the thyroid gland and the radiation image conversion plate 13.

Thereafter, the radioisotope detection probe 1 is removed from the neck 3, and the radiation image forming unit 7 is removed from the radioisotope detection probe 1. The light shielding bag 15 taken out from the radiation image forming unit 7 or the radiation image forming unit 7 is carried into the dark room, the radiation image conversion plate 13 is taken out, and the image is captured by a dedicated image analyzer (for example, BAS-2500 Fuji Photo Film). Get a statue.

[0027] According to the radioisotope detection probe 1 of the present embodiment, while forming a latent image, the radioisotope detection probe 1 is fixed to the neck 3 of the subject body. And the relative position of the radiation image conversion plate 13 do not change, and as a result, the image is not blurred and a clear image is obtained. [0028] In addition, the radiation image forming unit 7 and the neck 3 can be brought into a close contact state, and the distance between the radiation image conversion plate 13 and the thyroid gland is reduced, so that the sensitivity is improved.

Further, according to the radioisotope detection probe 1 of the present embodiment, since the radiation image forming unit 7 and the light shielding bag 15 are detachable from the radioisotope detection probe 1, the radiation image forming unit It is convenient to carry 7 or the light shielding bag 15 in the dark room and analyze it.

[0029] <Second Embodiment>

A second embodiment of the present invention will be described with reference to FIGS. Note that the same components as those in the first embodiment are denoted by the same reference numerals, and description of the structure, operation, and effect is omitted.

The second embodiment is different from the first embodiment mainly in that the structure of the fixture 5 and the collimator 21 are provided.

[0030] radioisotope detector probe 1 of this embodiment, like the first embodiment, accumulated in the thyroid of subjects, is for obtaining a radiation image of the Ru ¹² and ^m i. This radioisotope detection probe 1 is formed in a portal cross-sectional shape as a whole as shown in FIGS. 7 to 9, and is fitted over the neck 3 of a subject lying on his / her back on a bed. It can be fixed to 3 (see Fig. 11).

As shown in FIG. 9, the fixture 5 includes a substantially rectangular frame-shaped upper surface wall 23 having an opening in the center, and a pair of side pieces 25 that extend downward on both the left and right ends of the upper surface wall 23. The lid portion 27 that covers the opening of the upper wall 23 forms a gate shape as a whole. On the lower end surface of each side piece 25, a screw-type leg portion 25A for height adjustment is provided. The leg portion 25A is screwed into a screw hole 25B whose upper end is threaded upward from the lower end surface of the side piece 25. By turning the leg portion 25A clockwise or counterclockwise, the top wall 23 is displaced in the vertical direction. In this way, the height of the top wall 23 can be adjusted according to the height of the subject's neck.

[0032] Between the top wall 23 and the lid portion 27, a collimator 21 and a light shielding bag 15 into which a radiation image conversion plate 13 containing a stimulable phosphor is inserted are arranged almost horizontally. By tightening the fastener 28, the collimator 21 and the light shielding bag 15 are crimped while the top wall 23 and the lid 27 Sandwiched between. The lower surface of the collimator 21 is also exposed to the opening force. As shown in FIGS. 8 and 9, on the lower surface of the collimator 21 and the inside of the both side pieces 25, a cushioning material 29 covered with a soft cloth and a cloth 29B is disposed around an elastic resin 29A such as a polyurethane sponge. These cushioning materials 29 prevent the neck 3 from being damaged, and the neck 3 is supported and fixed in three directions by these cushioning materials 29, so that the fixing tool 5 is fixed even if the neck 3 slightly swings left and right. And the relative position of the neck 3 does not change.

The collimator 21 has a lead plate shape as a whole, and is provided with a plurality of through holes 31 penetrating in a direction intersecting the surface of the radiation image conversion plate 13.

Specifically, as shown in FIG. 10, the collimator 21 is, for example, a lead cylindrical tube having a height of 10 mm, a wall thickness of 0.14 mm, and an inner diameter of 3 mm arranged in a hermetic manner and interconnected. (See Fig. 10 (A), below collimator A), and (b) Lead cylindrical tubes with a height of 20 mm, wall thickness of 0.14 mm, and inner diameter of 2 mm arranged in a hard cam and interconnected. (See Fig. 10 (B), below collimator B) and (c) Lead hexagonal pipes with a height of 40 mm, wall thickness of 0.2 mm, and diagonal diameter of 2 mm arranged in a double cam shape. Interconnected (see Fig. 10 (C), collimator C).

According to the configuration of the present embodiment, since the collimator 21 is provided, the radiation in the direction of the through hole 31 selectively passes and the resolution of the image formed on the radiation image conversion plate 13 is improved. To do.

In addition, since the radioisotope detection probe 1 of the present embodiment is used in close contact with the human neck 3, the distance between the radiation image conversion plate 13 and the thyroid gland is close, so that the sensitivity is good.

Further, in the system using the radioisotope detection probe 1 of the present embodiment, the radioisotope detection probe 1 is separable from the image analysis apparatus and is small and lightweight, so that the subject's hospital room and Then, after transporting only the radioisotope detection probe 1 to the home of the subject at home and forming a latent image, the radioisotope detection probe 1 may be taken back to the laboratory and analyzed by an image analyzer. Therefore, it is possible to remarkably reduce the burden of these patients, which is not necessary for serious patients and elderly people to go to the examination room.

[0035] <Example>

Here, an experiment conducted using the radioactive element detection probe 1 of the second embodiment This will be described in detail.

As the radiation image conversion plate 13, an imaging plate (medical IP; ST-III, Fuji Photo Film) was cut into 110 mm X 200 mm and used.

The imaging plate erased the afterimage using an eraser for 30 minutes immediately before use. The imaging plate was inserted into the light shielding bag 15 to prevent the latent image from being erased by white light (visible light). Then, the radioisotope detection probe A shown in FIG.

[0036] <Radioisotope detection probe B>

Radioisotope detection probe B was prepared in the same manner as radioisotope detection probe A, except that collimator B was used.

A radioactive isotope detection probe C was prepared in the same manner as the radioactive isotope detection probe A except that the collimator C was used.

A radioisotope detection probe D was prepared in the same manner as radioisotope detection probe A, except that no collimator was used.

[0037] Formation and analysis of radiation images>

Radioisotope detection probes A to D were set on the neck-thyroid model 36 shown in FIG. This neck-thyroid model 36 consists of a model 37 equipped with a 20-ml hollow human thyroid model 33 (manufactured by Kyoto Kagaku; 1. 8 mm-thick methacrylic resin) and a cylindrical shape with an upper and lower bottom that surrounds this model 37. Neck model 41 (0.5mm thick methacrylic resin) (Note that the neck model 41 has a part of the side wall opened, and a 0.25 mm thick acrylic film 41 A is fitted here). The human thyroid model 33 is filled with ¹²³ I IMBq in total, and the neck model 41 is filled with water. When the radioisotope detection probes A to D were set on the neck-thyroid model 36, the acrylic film 41 A fitted in the opening of the neck model 41 was arranged so as to face the collimator 21.

The irradiation time is 10 minutes, and the imaging plate after irradiation is image analysis equipment (BAS-250 0 Fuji Photo Film), personal computer (Power Mac 8500/180, Apple Computer), measurement software (Image Reader ver.3.30 Fuji Photo Film), analysis software (Image Gauge ver.3.30 Fuji Photo Film). The reading sensitivity of the image analyzer was set to S1000.

[0038] The results are shown in FIG. (A) is when using radioisotope detection probe A, (B) is when using radioisotope detection probe B, (C) is when using radioisotope detection probe C, (D) is It is an image when the probe D for detecting a radioisotope is used. When the radioisotope detection probes A to C were used, the image resolution was higher than when the radioisotope detection probe D without a collimator was used, and the shape of the human thyroid model 33 was clearly observed. .

[0039] <Third embodiment>

Hereinafter, a third embodiment of the present invention will be described with reference to FIGS. The radioisotope detection probe 50 of this embodiment is an organ (such as the lung, liver, gastrointestinal tract, bone marrow, etc.) present in the body B of subject S (corresponding to a predetermined site of the present invention). This is to obtain a radiographic image of the radioisotope accumulated in the corresponding).

[0040] The radioisotope detection probe 50 of the present embodiment includes an apron 51 (corresponding to the fixture of the present invention) attached to the body B of the subject S, and a light shield attached to the apron 51. A bag 59 and a radiation image conversion plate 58 are provided (see FIG. 14).

The apron 51 includes a breast pad 52 (corresponding to the cushioning material of the present invention) that is addressed to the chest side in the body B of the subject S, and a back pad 53 (also of the present invention) that is addressed to the back side. Corresponding to cushioning material).

[0041] The breast pad portion 52 is formed in a rectangular bag shape with a cloth such as cotton, and the size of the chest pad portion 52 is set to be able to cover almost the entire chest of the subject S. In the breast pad portion 52, a long surface fastener 52B is attached to the inside of the opening portion 52A along the opening edge so that the mouth of the bag can be opened and closed. On the other hand, the back pad 53 is formed in a rectangular bag shape that is substantially the same shape as the breast pad 52, and its opening 53A can be similarly opened and closed by a surface fastener 53B. The breast pad portion 52 and the back pad portion 53 are attached to the subject S with the openings 52A and 53A facing down, respectively. [0042] One end of a pair of shoulder straps 54 is connected to the upper edge of the breast pad 52 (the edge on the side facing the opening edge) slightly outside the center in the left-right direction. The other end of the shoulder strap 54 is connected to a position slightly outside the center in the left-right direction at the upper edge of the back pad 53 (the edge on the side facing the opening edge). The interval between the pair of shoulder straps 54 is an interval through which the head and neck of the subject S can pass. These shoulder straps 54 are equipped with an agitator 55 so that the length can be adjusted freely! /

[0043] From the lower end positions of both side edges of the backrest portion 53, the belt portions 56 are each extended outward in the width direction. In the band portion 56, a loop tape 57A of a hook-and-loop fastener 57 is attached almost entirely to the surface which is the inner side (the side facing the body portion B of the subject S) when the subject S wears it. On the other hand, hook tape 57B, which is paired with loop tape 57A in hook-and-loop fastener 57, is attached to breast pad 52 at the left and right end positions at the lower end position of the outer surface when subject S wears! / RU With this surface fastener 57, the band 56 can be fixed to the breast pad 52 at an arbitrary position in the extending direction.

[0044] Inside the breast pad portion 52 and the back pad portion 53, a radiation image conversion plate 58 housed in the light shielding bag 59 is housed. The radiation image conversion plate 58 contains a stimulable phosphor as in the above embodiment, and for example, trade name: Imaging Plate manufactured by Fuji Photo Film Co., Ltd. can be used. As the light shielding bag 59, as long as it can prevent the latent image formed on the radiation image conversion plate 58 from being erased by blocking visible light, as in the above-described embodiment, for example, aluminum is used for polyethylene. Laminated materials can be used.

[0045] When the subject S is inspected using the radioisotope detection probe 50, first, the radiation image conversion plate 58 housed in the light shielding bag 59 is attached to the breast pad 52 and the apron 51. It is accommodated in the back pad 53 and the openings 52A and 53A are closed (see FIG. 15).

Next, the apron 51 is attached to the body B of the subject S (see FIG. 16). First, the subject's S neck is passed between a pair of shoulder straps 54, and the chest rest 52 is suspended from the shoulder so that the chest rest 52 is placed on the subject's S chest and the back rest 53 is placed on the back. At this time, the height of chest support 52 and back support 53 matches the position to be inspected on the chest and back by operating Ajista 55. Adjust as follows. Next, the band 56 is wrapped around the chest side while the chest pad 5 is firmly attached to the chest of the subject S and the back pad 53 is tightly attached to the back of the subject S. At this time, the loop tape 57A is attached to almost the entire inner surface of the belt portion 56. Therefore, the amount of winding of the belt portion 56 is adjusted according to the physique of the subject S, and the extension of the belt portion 56 is performed. It can be secured to the hook tape 57B on the breast pad 52 side at an appropriate position in the direction.

In this way, the apron 51 is fixed in a state where the chest rest 52 is placed on the chest of the subject S and the back rest 53 is placed in close contact with the back.

[0047] Note that, for example, when the abdomen and waist of the subject S are inspected, the height of the chest pad part 52 and the back pad part 53 may be adjusted so as to match the abdomen and waist part by operating the adjuster 55. Good.

In this state, after waiting for a predetermined time, for example, 3 to 20 minutes, a latent image is formed on the radiation image conversion plate 58. During this waiting time, the subject S can change his / her posture freely within a range without changing the relative position of the chest pad 52 and the back pad 53 with respect to the body B of the subject S. It is also possible to do difficult work.

After a predetermined time has elapsed, the apron 51 is removed from the body B of the subject S, and the light shielding bag 59 containing the radiation image conversion plate 58 is removed from the breast pad 52 and the back pad 53. Then, the light shielding bag 59 is carried into the dark room, the radiation image conversion plate 58 is taken out, and analyzed by a dedicated image analysis device (for example, BAS-2500 Fuji Photo Film). If subject S has ^ingested radioactive materials such as ^6G Co, ¹³ ⁷ Cs, etc., and these radioactive materials have accumulated in each organ in the body, the organs accumulated by the radiation generated by these radioactive materials An image corresponding to the position and the accumulation amount is obtained.

As described above, in this embodiment, the radioisotope detection probe 50 is fixed substantially in close contact with the chest and back of the subject S while forming a latent image! Therefore, the relative positions of the radiation image conversion plate 58 and the chest and back do not change, and as a result, the image is not blurred and a clear image is obtained. In addition, the subject S who does not need a large-scale device as in the case of using a conventional whole body counter is not restrained for a long time, so for example, a simple inspection of the presence or absence of internal exposure of a worker working at a nuclear power facility. Etc. <Other embodiments>

The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention, and are within the scope not departing from the gist other than the following. Various modifications can be made.

(1) Although an example in which the collimator 21 is not used has been described in the first embodiment, the collimator 21 may be used in the same manner as in the second embodiment.

(2) In the second embodiment, the collimator 21 is exemplified by the one in which the predetermined pipes are arranged in the form of a heart cam. However, the shape and size of the pipes forming the collimator 21 are not particularly limited. Further, the present invention is not limited to the collimator 21 in which the tubes are assembled, and a plurality of through holes 31 may be formed in a lead-containing plate. The material of the collimator 21 is not limited to lead, and metals other than lead can also be used.

(3) As a predetermined organ to which the present invention can be applied, in addition to those exemplified in the above embodiment, for example, a breast, heart, sentinel lymph node, wrist joint, and other various organs may be used.

The predetermined part may be, for example, an extremity, a head, or the like other than those exemplified in the above embodiment.

In addition to the radioisotopes exemplified above, ¹²⁵ I, ^99m Tc, ^2Q1 T1, ⁸⁷ Ga, ^6Q Co, ¹³⁷ Cs, ² "An, and other radiation that can be detected from outside the human body The radioisotope detection probe of the present invention may be used to obtain an image of a radioisotope that emits.

(4) In the third embodiment, the chest pad part 52 and the back pad part 53 are attached to the subject S with the openings 52A and 53A on the lower side, but they may be attached with the opening part facing up or sideways. Yes. In the third embodiment, the side to which the belt portion 56 is attached is the back pad portion 53, but the side to which the belt portion is attached may be the breast pad portion.

Claims

The scope of the claims

[1] A radioactive isotope detection probe for obtaining a radiographic image of a radioisotope existing in a predetermined organ of a subject,

A fixture configured to be fixable to a predetermined part of the subject;

A light shielding bag that is supported and fixed to the fixture and shields visible light;

A radioisotope detection probe comprising a radiation image conversion plate inserted in the light shielding bag and containing a stimulable phosphor.

[2] A lead-containing collimator provided with a plurality of through holes penetrating in a direction intersecting the surface of the radiation image conversion plate is provided on the surface of the light shielding bag facing the predetermined portion. The radioisotope detection probe according to claim 1, wherein the probe is for detecting a radioisotope.

[3] The probe for detecting a radioisotope according to claim 1, wherein a side facing the predetermined part of the light shielding bag is covered with a buffer material.

[4] The radioisotope detection probe according to claim 2 or 3, wherein a side of the collimator facing the predetermined part is covered with a buffer material. .

[5] The radioisotope detection probe according to any one of claims 1 to 4, wherein the light shielding bag is configured to be detachable from the fixture. B

[6] A radioisotope detection method for obtaining a radiographic image of a radioisotope existing in a predetermined organ of a subject,

A fixing step of fixing the radiation image conversion plate containing the stimulable phosphor to the predetermined site of the subject in a state where the radiation image conversion plate is shielded by a light shielding member that shields visible light;

A latent image forming step of forming a latent image on the radiation image conversion plate by leaving the fixed radiation image conversion plate for a predetermined time; and

Analyzing the formed latent image to obtain the radiation image, and a radioisotope detection method.