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Cherenkov event pulse digitization method and device

A case and pulse technology, which is applied in the field of Cherenkov case pulse digitalization method and device, can solve the problems of affecting the imaging signal-to-noise ratio, reducing the imaging signal-to-noise ratio, and high system cost, and achieves high imaging signal-to-noise ratio and improved The effect of temporal resolution

Inactive Publication Date: 2019-05-31
NANCHANG UNIV
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Problems solved by technology

[0004] At present, the self-illumination phenomenon of biological tissues easily affects the imaging signal-to-noise ratio, reduces the imaging signal-to-noise ratio, and the system cost is high

Method used

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  • Cherenkov event pulse digitization method and device
  • Cherenkov event pulse digitization method and device
  • Cherenkov event pulse digitization method and device

Examples

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example 1

[0066] The parameters of data processing in this embodiment are listed here:

[0067] The actual device used in step (1) is a dark box with a size of 1.4m×1.4m×1.0m. The radiation source is 511kev positron annihilation gamma photon 18F-FDG, and the red light enhanced silicon photomultiplier tube is used, and the detector adopts a ring structure;

[0068] Step (2) 24 hours without load, to obtain background data;

[0069] The matching time of step (3) is about 2 ns, and the matching judgment adopts offline time matching processing;

[0070] Step (4) uses the analytical Cherenkov event reconstruction method to directly plot Cherenkov's time and location.

example 2

[0072] The parameters for processing data in this application instance 2 are listed here:

[0073] The actual device used in step (1) is a dark box with a size of 1.8m×1.8m×1.8m. The radiation source is 511kev 124I-NaI, the red light enhanced silicon photomultiplier tube is used, and the detector adopts a ring structure;

[0074] Step (2) 72 hours without load, to obtain background data;

[0075] The matching time of step (3) is about 10 ns, and the matching judgment adopts online time matching processing;

[0076] Step (4) adopts the iterative Cherenkov event reconstruction method, approximates the time and position of Cherenkov, and iterates 200 times.

[0077] The method and device of the present invention can be used in nuclear technology that radiates charged particles, including nuclear detection, nuclear analysis, and nuclear medicine instruments.

[0078] By adopting the Cherenkov case pulse digitalization method and device of the present invention, the marking of t...

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Abstract

The invention discloses a Cherenkov event pulse digitization method and device, and belongs to the fields of event pulse detection systems, photoelectric signal processing and nuclear detection. The method comprises the following steps: S1, obtaining a data set of the of the Cherenkov event emission photons; S2, obtaining a data set of background light, S3, calculating a joint likelihood probability function or a posterior probability function of the data set of the Cherenkov event emission photons in each time period; S4, judging whether the data set of the background light in each time period is the data set of the background light or the data set of the Cherenkov event emission photons. The device comprises a Cherenkov event emission photon data set obtaining module, a background photondata set obtaining module, an independent photon correlator module and an event classifier module. The method and device are high in signal-to-noise ratio and spatial resolution.

Description

technical field [0001] The invention belongs to the fields of event pulse detection system, photoelectric signal processing and nuclear detection, and in particular relates to a Cherenkov event pulse digitalization method and device. Background technique [0002] Japan uses the Cherenkov counter to detect the rupture of the heating element. Water samples taken from the reactor's active zone were analyzed using Cherenkov radiation, emitted by high-energy beta particles emitted by short-lived fission fragments as they pass through the water. Compared with the currently used gamma spectrometer or delayed neutron detector, the Cherenkov calculator can better guarantee the speed and sensitivity of the analysis. The results of some experiments carried out by Sawami and Yamada on the rupture of heat release elements show that when the concentration of fission products in water is lower than 600 pCi / cm~3, the ratio of signal counts to background counts can reach 10:1 . For a gene...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01T1/24G01T1/18
Inventor 邓贞宙赖文升陈冠东刘志涛段志文韩春雷
Owner NANCHANG UNIV
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