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Radioactive ray detecting method and device utilizing energy and position information

A radiation detection and position information technology, applied in measurement devices, radiation measurement, radiation intensity measurement, etc., can solve the problem of insufficient use of the high-sensitivity measurement method of the PET device and the amount of information, and reduce the mixing ratio and improve the noise ratio. , the effect of improving sensitivity

Inactive Publication Date: 2010-03-31
NAT INST FOR QUANTUM & RADIOLOGICAL SCI & TECH +1
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Problems solved by technology

[0008] Therefore, in a PET device equipped with a three-dimensional detector, it is possible to adopt a detector arrangement with a higher sensitivity than that of the conventional PET device. Problems of method and richness of information

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  • Radioactive ray detecting method and device utilizing energy and position information
  • Radioactive ray detecting method and device utilizing energy and position information
  • Radioactive ray detecting method and device utilizing energy and position information

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Embodiment Construction

[0036] Embodiments of the present invention will be described in detail below with reference to the drawings.

[0037] The first embodiment of the present invention is as Figure 9 As shown, in a PET device or the like equipped with a three-dimensional detector 20, such as Figure 10 As shown, the detector scatter is exploited by limiting the detection depth also in the low energy region, as Figure 11 As shown, there is a mechanism for identifying an event C scattered in the object 6 and an event B that imparts a part of energy to the detector 20 after scattering in the detector 20 . As a result, it is possible to further increase the sensitivity of a PET apparatus having a three-dimensional detector or the like while preventing deterioration of positional information.

[0038] exist Figure 12 Indicates the sequence of matches.

[0039] In addition, in the case of stacking detection elements in the present invention, it is not necessary to use the same detection element in...

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Abstract

The invention relates to a radioactive ray detecting method and device utilizing energy and position information. When a radioactive ray is detected by using a (three-dimensional) detector capable ofdiscriminating the detection position in a depth direction and an energy, a scattered component in a detector can be acquired, by changing an energy window for discriminating signals and noises, in accordance with the detection position in the depth direction. Alternatively, the scattered component in the detector can be acquired by weighting a detection event according to the detection position in the depth direction and the energy information. As a result, the scattered component in the detector can be acquired to enhance the sensitivity of the detector. Here, a different detecting element can be used according to the detection position in the depth direction.

Description

technical field [0001] The present invention relates to a radiation detection method and device, in particular to a radiation detection method and device which are suitable for use in a positron imaging device or a positron emission tomography (PET) device and utilize energy and position information. Background technique [0002] like figure 1 As shown, the positrons released from the positron-releasing nuclide 8 due to +β decay are annihilated with the surrounding electron pairs, and a pair of 511keV annihilation radiation 8a, 8b thus generated is formed by the principle of coincidence PET devices are known in which pairs of radiation detectors 10a, 10b measure the annihilation radiation 8a, 8b. At this time, in order to use only the annihilation radiation endowed with energy of 511 keV, the lower limit and upper limit of the acquired energy (signal) are limited by the energy window. Thereby, the existence position of the nuclide 8 can be specified on one line segment (li...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01T1/20G01T1/161
CPCG01T1/2985A61B6/037G01T1/1647
Inventor 吉田英治涩谷宪悟山谷泰贺村山秀雄北村圭司
Owner NAT INST FOR QUANTUM & RADIOLOGICAL SCI & TECH
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