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Method and system for restoring scintillation pulse information

A scintillation pulse and pulse technology, applied in the field of scintillation pulse information restoration, can solve the problems of limited quantization accuracy, high sampling rate and high bandwidth, achieve high counting rate, improve energy resolution, and avoid quantization errors

Active Publication Date: 2018-06-05
RAYCAN TECH CO LTD SU ZHOU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This ADC is characterized by high sampling rate and high bandwidth, but limited quantization accuracy

Method used

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  • Method and system for restoring scintillation pulse information
  • Method and system for restoring scintillation pulse information
  • Method and system for restoring scintillation pulse information

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0126] The parameters of data processing in this embodiment are listed here:

[0127] The actual system used in step (1) used LYSO crystal and Hamamatsu R9800PMT. The crystal size is 16.5mm x 16.5mm x 10.0mm. The coupling surface of the crystal and the PMT is 100 surfaces, except for the coupling surface, the other surfaces are wrapped with Teflon tape. The sampling rate of the data acquisition system is 50Ghz, and the bandwidth is 16Ghz. like Figure 10 As shown, the source is 511keV positrons annihilate gamma photons. The average pulse rise time is about 2 ns, and the time constant is 42.5497 ns after the falling edge is fitted with an exponential.

[0128] Δt=200ns used in step (2.1).

Embodiment 2

[0130] The parameters of data processing in this embodiment are listed here:

[0131] like Figure 11 As shown, the actual system used in step (1) uses LYSO crystal and FM300035 SIPM. The crystal size is 2.0 mm x 2.0 mm x 10.0 mm. The coupling surface of the crystal and the PMT is 100 surfaces, except for the coupling surface, the other surfaces are wrapped with Teflon tape. The sampling rate of the data acquisition system is 50Ghz, and the bandwidth is 16Ghz. like Figure 10 As shown, the source is 511keV positrons annihilate gamma photons. The average pulse rise time is about 5ns.

[0132] Δt=300ns used in step (2.1).

Embodiment 3

[0134] Here are the parameters for processing data in this application example:

[0135]The actual system used in step (1) uses LaBr crystal and Hamamatsu R9800PMT. The crystal size is 3.5mm x 3.5mm x 5.0mm. The coupling surface of the crystal and the PMT is 100 surfaces, except that the coupling surface is a light guide, and the other surfaces are sealed with metal. The sampling rate of the data acquisition system is 50Ghz, and the bandwidth is 16Ghz. like Figure 10 As shown, the source is 511keV positrons annihilate gamma photons. The average pulse rise time is about 2ns.

[0136] Δt=100ns used in step (2.1).

[0137] The method and system for recovering scintillation pulse information of the present invention can be used in nuclear detection, nuclear analysis, and nuclear medicine instruments that require direct digitization of signals.

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Abstract

A method for recovering scintillation pulse information. The method comprises the steps: obtaining a scintillation pulse database of unstacked compliance single-events in a low count, and establishing a noise model of a scintillation pulse for the scintillation pulse database of the single-events; calculating a posterior probability logarithm value of a specific energy value according to the noise model of the scintillation pulse; and repeatedly calling the second step by means of calculations, and obtaining an energy value meeting a maximum posterior probability condition. A system for recovering scintillation pulse information. The system comprises a fluctuation model module, a posterior probability module, and an energy value search module. The method and system for recovering scintillation pulse information in the present invention effectively improve the precision of a system energy calculation, and is specifically suitable for an energy calculation of a sparse quantization level ADC digital nuclear instrument.

Description

technical field [0001] The invention relates to the fields of digital signal processing, photoelectric signal processing and radiation detection, in particular to a method and system for restoring scintillation pulse information. Background technique [0002] In nuclear analysis fields such as positron lifetime spectrometers, positron angle-momentum correlation analyzers, nuclear detection fields such as double-coincidence high-energy particle discriminators, and medical imaging fields such as positron emission tomography (Positron Emission Tomography, hereinafter referred to as PET) , the main working principle of detecting high-energy particles is to convert high-energy rays into electrical signals, and then use fast electronics to obtain various information about particle events. In some instrument applications with logical operations and time stamps, shaping and slowing down the scintillation pulse will affect its time performance and increase the probability of event pu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01T7/00G01T1/20
CPCG01T1/20G01T1/208G01T1/362G01T1/2985
Inventor 谢庆国邓贞宙
Owner RAYCAN TECH CO LTD SU ZHOU