Accumulation event detection and reconstruction method and system

An event detection and event technology, applied in X-ray energy spectrum distribution measurement, etc., can solve problems such as false triggering, inaccurate and limited rising edge capture

Active Publication Date: 2014-10-15
RAYCAN TECH CO LTD SU ZHOU
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

Moreover, the differential operation of the above method is very sensitive to the spike noise in the photomultiplier tube, resulting in false triggering of event arrival
Especially when the slope of the rising edge of the electric pulse is small, the capture of the rising edge will be very inaccurate
Also, the method is limited to a fixed impulse model

Method used

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  • Accumulation event detection and reconstruction method and system

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example 1

[0123] The invention proposes a method and system for detecting and reconstructing accumulation events. The involved parameters and filter design need to be adjusted according to the characteristics of the acquired data to achieve good energy resolution performance and short pulse duration. Here are the parameters for processing data in this application example:

[0124] 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. Positrons with a radiation source of 511 keV 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. Step (1) Obtain the response model of the scintilla...

example 2

[0128] Here are the parameters for processing data in this application example 2:

[0129] The actual system used in step (1) uses LYSO crystals such as Figure 11 and FM300035SIPM. 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 (such as Figure 10 ). Positrons with a radiation source of 511 keV annihilate gamma photons. The average pulse rise time is about 5ns. 50 pulses are used for average operation, and then exponential fitting is performed, and the fitted model is used as the response model.

[0130] Step (2.1) employs V l =0.060V, V t =0.006V. Through the deconvolution of step (2), the accumulated data is roughly separated.

[0131] Step (3.2) employs V u =6Vns. Further separate stacked data.

example 3

[0133] The parameters for processing data in this application example 3 are listed here:

[0134] 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 (such as Figure 10 ). Positrons with a radiation source of 511 keV annihilate gamma photons. The average pulse rise time is about 2ns.

[0135] Step (2.1) employs V l =0.100V, V t =0.010V. Through the deconvolution of step (2), the accumulated data is roughly separated.

[0136] Step (3.2) employs V u =10Vns. Further separate stacked data.

[0137] The method and system of the present invention can be used in nuclear detection, nuclear analysis, and nuclear medicine instruments under the background of high cou...

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Abstract

Provided is an accumulation event detection and reconstruction method which comprises the steps that: a flicker pulse database of non-accumulation conformation single events under low count is acquired, average pulse of the flicker pulse database of each path of the non-accumulation conformation single events is obtained, and shape information of flicker pulse is designated by average pulse; de-convolution is performed by adopting an MLEM algorithm, and arrival time of flicker pulse is defined as peak time of a de-convolution sequence; the single events in accumulation are segmented by adopting an MAP criterion, and the energy value of the events is extracted via summarizing; and the acquired shape, time and energy information is stored as table data so that accumulation event reconstruction is completed. When the system is in operation, each single event in accumulation can be effectively detected, segmented and recovered so that system counting rate is effectively increased, energy resolution under high counting rate is enhanced, and thus the method is especially suitable for processing of various accumulation events in an offline environment.

Description

technical field [0001] The invention relates to the fields of digital signal processing, photoelectric signal processing and nuclear detection, in particular to a method and system for detecting and reconstructing accumulation events. Background technique [0002] In the field of nuclear analysis such as positron lifetime spectrometer and Mössbauer spectrometer, in the field of nuclear detection such as energy spectrometer and radiation counter, as well as in computed tomography (Computed Tomography, hereinafter referred to as CT), positron emission tomography (PositronEmissionTomography, In the field of medical imaging such as PET (hereinafter referred to as PET) and Single Photon Emission Computed Tomography (hereinafter referred to as SPECT), the working mechanism of the detector part is mainly divided into two types: one is to convert high-energy photons into lower-energy photons through scintillators Visible photons or ultraviolet photons, and then convert visible light...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01T1/36G01T1/40
Inventor 谢庆国邓贞宙肖鹏
Owner RAYCAN TECH CO LTD SU ZHOU
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