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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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  • 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 detection efficiency of SPECT.
In addition, the existing single photon emission tomography device still has defects such as large size and poor collimation effect of the collimator.

Method used

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Examples

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Effect test

Embodiment 1

[0033] In this example, if figure 1 As shown, the radionuclide in the detected object (such as the human body 3) produces gamma photons, and the imaging device includes and is not limited to two detector layers, which are distributed in front and rear layers along the gamma photon transmission direction outside the human body, Wherein, the detector layer ahead along the photon transmission direction is the first detector layer 1, the detector layer behind the photon transmission direction is the second detector layer 2, and the previous detector layer (the first detector layer ) is closer to the human body than the subsequent detector layer (the second detector layer). The first detector layer 1 includes four independent scintillation crystal strips 11, 12, 13, 14 (although the present embodiment is an independent scintillation crystal strip, the quantity is several, but in fact also can adopt the splicing scintillation crystal strip or both Several combinations) and three Si...

Embodiment 2

[0040] In this example, if figure 2 As shown, the radionuclide in the object to be detected (such as the human body 3) produces gamma photons, and the imaging device includes two detector layers, which are distributed in front and rear layers along the movement direction of the gamma photons outside the human body. The detector layer in front of the photon movement direction is the first detector layer 1, the detector layer behind the photon movement direction is the second detector layer 2, and the front detector layer (first detector layer) is more The last detector layer (the second detector layer) is closer to the human body. The first detector layer 1 includes four independent scintillation crystal strips 11, 12, 13, 14 and three SiPM devices 15, 16, 17 (15, 16, 17 can also use APD optoelectronic devices), the second detector layer 2 includes a scintillation crystal strip 21 and a PMT device 22 (22 is not limited to a PMT device, and can be any type of optoelectronic de...

Embodiment 3

[0044] In this example, if image 3 As shown, the radionuclide in the object to be detected (such as the human body 3) produces gamma photons, and the imaging device includes two detector layers, which are distributed in front and rear layers along the movement direction of the gamma photons outside the human body. The detector layer in front of the photon movement direction is the first detector layer 1, the detector layer behind the photon movement direction is the second detector layer 2, and the front detector layer (first detector layer) is more The last detector layer (the second detector layer) is closer to the human body.

[0045] The first detector layer is used to block and collimate photons moving towards the second detector layer, that is, to serve as a collimator. Traditional SPECT cannot use a collimator with a high penetration ratio due to its own limitations. This disclosure uses the front detector layer as a collimator to cause its photon collimation effect o...

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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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