Detector for Compton camera and Compton camera

Patent metadata

Field	Value
Publication number	US-10175368-B2
Application number	US-201515329770-A
Country	US
Kind code	B2
Filing date	Jul 31, 2015
Priority date	Aug 4, 2014
Publication date	Jan 8, 2019
Grant date	Jan 8, 2019

Abstract

A detector for a Compton camera includes a first radiation scattering layer; a second radiation scattering layer; and a radiation absorption layer disposed between the first radiation scattering layer and the second radiation scattering layer. The first radiation scattering layer and the radiation absorption layer configure at least a part of a first detector, and the second radiation scattering layer and the radiation absorption layer configure at least a part of a second detector.

First claim

The invention claimed is:

1. A detector for a Compton camera, comprising:
a first radiation scattering layer;
a second radiation scattering layer; and
a radiation absorption layer disposed between the first radiation scattering layer and the second radiation scattering layer,
wherein the first radiation scattering layer and the radiation absorption layer configure at least a part of a first detector,
wherein the second radiation scattering layer and the radiation absorption layer configure at least a part of a second detector,
wherein the first radiation scattering layer Compton-scatters a radiation from a radiation source in a hemisphere on one side with respect to the radiation absorption layer, and
wherein the second radiation scattering layer Compton-scatters a radiation from a radiation source in a hemisphere on the other side with respect to the radiation absorption layer.

2. The detector according to claim 1 , wherein, when a first radiation is scattered, the first radiation scattering layer outputs a first signal corresponding to a first position of the scattering and first energy given by the scattering,
wherein, when a second radiation is scattered, the second radiation scattering layer outputs a second signal corresponding to a second position of the scattering and second energy given by the scattering,
wherein the radiation absorption layer:
outputs a third signal corresponding to a third position where the absorption is carried out, and third energy by the absorption, when the first radiation having been scattered in the first radiation scattering layer is absorbed, and
outputs a fourth signal corresponding to a fourth position where the absorption is carried out and fourth energy of absorption, when the second radiation having been scattered in the second radiation scattering layer is absorbed.

3. The detector according to claim 1 , wherein at least one of the first radiation scattering layer, the radiation absorption layer and the second radiation scattering layer is provided by plural layers.

4. The detector according to claim 3 , wherein the number of layers of the first radiation scattering layer and the number of layers of the second radiation scattering layer are identical to each other.

5. The detector according to claim 1 , further comprising:
a holding mechanism disposed to hold the first radiation scattering layer, the radiation absorption layer and the second radiation scattering layer in a stacked state.

6. The detector according to claim 5 , wherein the holding mechanism holds the first radiation scattering layer, the radiation absorption layer and the second radiation scattering layer to be detachable.

7. The detector according to claim 1 , wherein the first radiation scattering layer, which comprises at least one first scattering layer, the second radiation scattering layer, which comprises at least one second scattering layer, and the radiation absorption layer, which comprises at least one absorption layer, are alternately stacked, and
wherein the first radiation scattering layer and the second radiation scattering layer between adjacent two layers of the radiation absorption layer are unified to be one body.

8. The detector according to claim 1 , further comprising:
plural layers of the radiation absorption layer; and
a radiation scattering layer in which the first radiation scattering layer and the second radiation scattering layer are unified, which are arranged between adjacent two layers of the radiation absorption layer.

9. A Compton camera comprising:
a detector for a Compton camera;
wherein the detector comprises:
a first radiation scattering layer;
a second radiation scattering layer; and
a radiation absorption layer disposed between the first radiation scattering layer and the second radiation scattering layer,

wherein the first radiation scattering layer and the radiation absorption layer configure at least a part of a first detector,
wherein the second radiation scattering layer and the radiation absorption layer configure at least a part of a second detector,
wherein the first radiation scattering layer Compton-scatters a radiation from a radiation source in a hemisphere on one side with respect to the radiation absorption layer, and
wherein the second radiation scattering layer Compton-scatters a radiation from a radiation source in a hemisphere on the other side with respect to the radiation absorption layer, and
an information processing unit disposed to calculate a position of the radiation source and energy of the radiation, based on a signal outputted from the first radiation scattering layer and the radiation absorption layer or a signal outputted from the second radiation scattering layer and the radiation absorption layer, in the detector for the Compton camera in response to the radiation incident thereto.

10. The Compton camera according to claim 9 , wherein, when a first radiation is scattered, the first radiation scattering layer outputs a first signal corresponding to a first position of the scattering and first energy given by the scattering,
wherein, when a second radiation is scattered, the second radiation scattering layer outputs a second signal corresponding to a second position of the scattering and second energy given by the scattering,
wherein the radiation absorption layer:
outputs a third signal corresponding to a third position where the absorption is carried out, and third energy by the absorption, when the first radiation having been scattered in the first radiation scattering layer is absorbed, and
outputs a fourth signal corresponding to a fourth position where the absorption is carried out and fourth energy of absorption, when the second radiation having been scattered in the second radiation scattering layer is absorbed.

11. The Compton camera according to claim 9 , wherein at least one of the first radiation scattering layer, the radiation absorption layer and the second radiation scattering layer is provided by plural layers.

12. The Compton camera according to claim 11 , wherein the number of layers of the first radiation scattering layer and the number of layers of the second radiation scattering layer are identical to each other.

13. The Compton camera according to claim 9 , further comprising:
a holding mechanism disposed to hold the first radiation scattering layer, the radiation absorption layer and the second radiation scattering layer in a stacked state.

14. The Compton camera according to claim 13 , wherein the holding mechanism holds the first radiation scattering layer, the radiation absorption layer and the second radiation scattering layer to be detachable.

15. The Compton camera according to claim 9 , wherein the first radiation scattering layer, which comprises at least one first scattering layer, the second radiation scattering layer, which comprises at least one second scattering layer, and the radiation absorption layer, which comprises at least one absorption layer, are alternately stacked, and
wherein the first radiation scattering layer and the second radiation scattering layer between adjacent two layers of the radiation absorption layer are unified to be one body.

16. The Compton camera according to claim 9 , further comprising:
plural layers of the radiation absorption layer; and
a radiation scattering layer in which the first radiation scattering layer and the second radiation scattering layer are unified, which are arranged between adjacent two layers of the radiation absorption layer.

Assignees

• Mitsubishi Heavy Ind Ltd
• Japan Aerospace Exploration

Inventors

• GEMBA Kei
• Kuroda Yoshikatsu
• Ikebuchi Hiroshi
• Matsuura Daisuke
• Takahashi Tadayuki
• Watanabe Shin
• Takeda Shin'Ichiro

Classifications

• G01T1/29 Primary

  Measurement performed on radiation beams, e.g. position or section of the beam; Measurement of spatial distribution of radiation · CPC title

• G01T1/242

  Stacked detectors, e.g. for depth information (constructional or manufacturing details H10W90/00) · CPC title