Single photon emission tomography device

A single-photon emission and tomographic imaging technology, which is applied in nuclear technology and application fields, can solve problems such as poor collimation effect of the collimator, affecting the detection efficiency of SPECT, and large size, and achieves the effect of reducing the size

Pending Publication Date: 2022-02-22
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since the photons absorbed by the heavy metal absorbing collimator cannot be detected by the detector, a large amount of photons will be lost, which seriously affects the

Method used

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  • Single photon emission tomography device
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Examples

Experimental program
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Example Embodiment

[0032] Example 1

[0033] In this embodiment, if figure 1 As shown, the radionuclide in which the object (e.g., human body 3) is detected produces a gamma photon, and the image forming apparatus includes and is not limited to two detector layers, and the outer portion of the body is in front and rear two layers of distribution. Among them, the detector layer in front of the photon transport is the first detector layer 1, and the detector layer in the photon transport direction is the second detector layer 2, in the previous detector layer (first detector layer) ) Closer to the human body than afterward detector layers (second detector layers). The first detector layer 1 includes four independent scintillation crystals 11, 12, 13, 14 (although the embodiment is a separate scintillation crystal strip, a number of quantities, but in fact, a splicing crystal strip or both Several combination) and three SIPM devices 15, 16, 17 (15, 16, 17), the second detector layer 2 includes a scinti...

Example Embodiment

[0039] Example 2

[0040] In this embodiment, if figure 2 As shown, the radionuclide in which the object (e.g., human body 3) is detected produces a gamma photon, and the imaging device includes two detector layers, and the outer portion of the human body is in front and rear two layers, wherein The photon motion direction is the first detector layer 1, and the detector layer in the photon motion direction is the second detector layer 2, in the previous detector layer (first detector layer) The post-detector layer (second detector layer) is closer to the human body. The first detector layer 1 includes four independent scintillation crystals 11, 12, 13, 14, and three SIPM devices 15, 16, 17 (15, 16, 17), APD photoelectric devices can also be employed, the second detector layer 2 includes a scintillation crystal strip 21 and a PMT device 22 (22 is not limited to the PMT device, which can be any type of optoelectronic device). The scintillation crystal is used to receive gamma photon...

Example Embodiment

[0043] Example 3

[0044] In this embodiment, if image 3 As shown, the radionuclide in which the object (e.g., human body 3) is detected produces a gamma photon, and the imaging device includes two detector layers, and the outer portion of the human body is in front and rear two layers, wherein The photon motion direction is the first detector layer 1, and the detector layer in the photon motion direction is the second detector layer 2, in the previous detector layer (first detector layer) The post-detector layer (second detector layer) is closer to the human body.

[0045] The first detector layer is used to block and colliminate the photons moving to the second detector layer, namely a collimator. Conventional SPECT is unable to adopt high-penetrating proportion due to its own restrictions, and the present disclosure is used as a collimator on the previous detector layer, which improves detection efficiency. .

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Abstract

The invention provides a single photon emission tomography device. The single photon emission tomography device comprises a plurality of detector layers, the plurality of detector layers comprise at least two detector layers arranged along a photon movement direction, the at least two detector layers comprise the front detector layer and the rear detector layer along the photon movement direction, the front detector layer comprises a scintillation crystal array and silicon photomultipliers, and at least one of the number, the size and the position of the coupled silicon photomultipliers of adjacent scintillation crystal strips in the scintillation crystal array relative to the scintillation crystal array is different, so that different gamma photon direction information can be distinguished; and the probabilities that gamma photons from different directions penetrate through the front detector layer are different from each other, so that the front detector layer has a gamma photon collimation effect on the rear detector layer.

Description

technical field [0001] The present disclosure relates to the field of nuclear technology and application technology, in particular to a single photon emission tomography device. Background technique [0002] Single Photon Emission Computed Tomography (SPECT) technology uses radionuclide-labeled tracer drugs to generate gamma photons after being injected into the human body, and the distribution and changes of drugs in the human body can be known by detecting rays outside the human body information, and used for disease diagnosis and treatment. SPECT imaging is a typical molecular imaging method, which can reflect the physiology, metabolism, function and molecular information in the human body, and is one of the current mainstream medical imaging methods. [0003] Since the process of radionuclides emitting gamma photons is isotropic, if the detector is placed directly outside the human body, the direction of the detected gamma photons cannot be determined, that is, it is im...

Claims

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Application Information

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IPC IPC(8): G01T1/29G01T1/24G01T1/202A61B6/03
CPCG01T1/2985G01T1/248G01T1/249G01T1/202A61B6/037
Inventor 马天予刘亚强王学武王忠
Owner TSINGHUA UNIV
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