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Gamma radiation imaging device and imaging method

An imaging device and gamma ray technology, which are applied in nuclear technology and application fields, can solve the problems of low detection efficiency, long acquisition time, and reduced directional information of imaging devices, so as to improve judgment effect, imaging quality, and high photon detection efficiency , the effect of high photon event information

Active Publication Date: 2020-06-26
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] To sum up, the traditional gamma radiation imaging device absorbs a large number of photons due to the collimator adopting the principle of absorption collimation, resulting in low detection efficiency of the imaging device, resulting in long acquisition time, or poor image quality within a limited acquisition time; The coded aperture collimator with aperture ratio improves the detection efficiency, but reduces the directional information carried by the received photon events, and its image quality has not been improved accordingly

Method used

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  • Gamma radiation imaging device and imaging method

Examples

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Embodiment 1

[0046] In this example, if figure 1 As shown, the imaging device includes 9 detectors, and the 9 detectors form 3 detector layers, which are distributed in 3 layers outside the object to be detected (such as the human body), and the first detector is sequentially from the inside to the outside. Detector layer, 2nd detector layer and 3rd detector layer. The nine detectors include two types of detectors, a first type detector 1 and a second type detector 2 . Moreover, any two adjacent detectors have different attenuation ratios to the photons.

[0047] Specifically, the first detector and the second detector are made of different materials. Using the imaging device of this embodiment, the light 3 from the position 5 of the detected object O and the light 4 from the position 6 respectively pass through the first detection before entering the second type detector 2 in the second detector layer. The first type detector 1 and the second type detector 2 in the detector layer, thus...

Embodiment 2

[0050] In this example, if figure 2 As shown, the imaging device includes 6 detectors, and the 6 detectors form 2 detector layers, which are distributed in 2 layers outside the object to be detected (such as the human body), and the first detector is sequentially from the inside to the outside. detector layer and the second detector layer. The six detectors are all the first type detectors 1 . Moreover, there is an interval between any adjacent two detectors, that is, there is an interval between the first detector layer and the second detector layer, and there is an interval between adjacent two detectors of the first detector layer. , There is also an interval between two adjacent detectors of the second detector layer.

[0051] Specifically, using the imaging device of this embodiment, the light 3 from the position 5 of the detected object and the light 4 from the position 6 are incident on the detector in the second detector layer, and the light from the position 5 of t...

Embodiment 3

[0055] In this example, if image 3 As shown, the imaging device includes 9 detectors, and the 9 detectors form 3 detector layers, which are distributed in 3 layers outside the object to be detected (such as the human body), and the first detector is sequentially from the inside to the outside. Detector layer, 2nd detector layer and 3rd detector layer. The nine detectors include two types of detectors, a first type detector 1 and a second type detector 2 . There is an interval between two adjacent detector layers, and the interval between the first detector layer and the second detector layer may be different from the interval between the second detector layer and the third detector layer. Any two adjacent detectors have different attenuation ratios to the photons. The effect of judging the direction of the photon is further improved by spacing each layer with a certain distance.

[0056] Specifically, using the imaging device of this embodiment, the light 3 from the positi...

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Abstract

The invention provides a gamma radiation imaging device and an imaging method. The imaging device comprises a plurality of separated detectors. Due to adoption of the plurality of the separated detectors, appropriate spatial positions, arrangement modes and detector materials are set up, and then at least one of thicknesses, materials and numbers of detectors that rays emitted from different positions of an imaging area reach at least one of the plurality of the detectors and passes through the detectors is different, so that an effect of judging directions of the rays can be achieved. By adopting the gamma radiation imaging device and the imaging method, absorption loss of photons on a collimator can be reduced, and photon direction judging effects and imaging quality can be improved.

Description

technical field [0001] The present disclosure relates to the field of nuclear technology and application technology, in particular to a gamma radiation imaging device and imaging method. Background technique [0002] Gamma radiation imaging is widely used in medical diagnosis, monitoring of nuclear leaks and nuclear radiation hotspots, nuclear waste management, and management and monitoring of industrial and agricultural radioactive sources. The gamma radiation imaging device is used to detect nuclides that emit gamma photons and form images of their distribution in space. It can be used independently as an industrial gamma camera, or as a gamma camera for medical diagnosis, or as a single Key functional components for Photon Emission Tomography (SPECT) or Positron Emission Tomography (PET). [0003] A gamma radiation imaging device generally includes two parts: a detector and a collimator. Among them, the detector part uses a position-sensitive gamma detector to obtain th...

Claims

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Application Information

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IPC IPC(8): A61B6/00A61B6/03G01T1/164
CPCA61B6/037A61B6/4266A61B6/4241A61B6/4208A61B6/4429G01T1/1641G01T1/242G01T1/2907G01T1/20181A61B6/06A61B6/4225G01T1/20G01T1/2985G21K1/02
Inventor 马天予刘亚强王学武王忠
Owner TSINGHUA UNIV
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