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Time stamp combining method and system

A technology of time marking and atomic time marking, which is applied in the fields of digital signal processing, photoelectric signal processing and nuclear detection, can solve the problems of ultra-high data throughput and processing, high cost, etc., achieve good adaptability, good system, and improve system time resolution rate effect

Active Publication Date: 2015-05-27
RAYCAN TECH CO LTD SU ZHOU
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the use of such a high-sampling-rate ADC will undoubtedly put PET in the predicament of high cost, ultra-high data throughput and processing
Similarly, the average pulse model method (Mean PMT Pulse Model, referred to as MPPM), the maximum rise interpolation method (Maximum Rise Interpolation, referred to as MRI) and the initial rise interpolation method (Initial Rise Interpolation, referred to as IRI) and other digital pulse time based on ADC sampling Extraction methods can also fall into the contradiction between high sampling rate requirements and high time resolution performance

Method used

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  • Time stamp combining method and system

Examples

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example 1

[0077] The parameters of data processing in this embodiment are listed here:

[0078] The actual system used in step (1) used LaBr crystal and Hamamatsu R9800PMT. The crystal size is 10.0 mm x 10.0 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 covered with metal. 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 coincidence time is about 2ns, and the energy window is about 400-600keV.

[0079] Step (2) employs frontier discrimination of multiple voltage threshold parameters as atomic markers.

[0080] Step (3) increments the atomic time stamp one at a time, and each increment of the time stamp maximizes the temporal resolution. Stop adding additional LED leading edge thresholds when the increased time resolution is greater than 1ps.

[0081] When testing and using in step (...

example 2

[0083] The parameters for processing data in this application example 2 are listed here:

[0084]The actual system used in step (1) used LaBr crystal and Hamamatsu R9800PMT. The crystal size is 10.0 mm x 10.0 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 covered with metal. 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 coincidence time is about 2ns, and the energy window is about 400-600keV.

[0085] Step (2) adopts 4 fixed CFD digital quantities and 4 EN-LED digital quantities.

[0086] When testing and using in step (4), apply the combined time-stamping parameters obtained in (3).

example 3

[0088] Here are the parameters for processing data in this application example:

[0089] The actual system used in step (1) used LaBr crystal and Hamamatsu R9800PMT. The crystal size is 10.0 mm x 10.0 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 covered with metal. 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 coincidence time is about 2ns, and the energy window is about 400-600keV.

[0090] Step (2) adopts 4 fixed digital quantities of the time of crossing the threshold of the leading edge and 4 digital quantities of the time of crossing the threshold of the trailing edge.

[0091] When testing and using in step (4), apply the combined time-stamping parameters obtained in (3).

[0092] The method and system of the present invention can be used in nuclear detection, nuc...

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Abstract

A time label combination method, comprising the steps: collecting data acquisition system digital measurement values and establishing a database for the measured values; identifying atomic time label quantities and shape fluctuation statistics; estimating a covariance matrix of each atomic time label; according to the least squares criterion, giving the time label combination. Also provided is a time label combination system, comprising a low-dose pre-acquisition data module, a digital identification module, a quantitative variance calculation module, and a time label combination parameter calculation module. By means of using the described time label combination method and system, system time resolution is effectively increased, and the invention is particularly suitable for nuclear instrument time acquisition.

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 combining event arrival time marks. 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 working mechanism of the detector part is mainly divided into two types: one is to convert high-energy photons into lower-energy visible photons or ultraviolet photons through scintillators, and then convert visible light photons or ultraviolet photons into electrical signals through optoelectronic devices The other is to directly convert high-energy photons into electrical signals through semicond...

Claims

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Application Information

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IPC IPC(8): G01T1/164
CPCG01T1/2985
Inventor 邓贞宙谢庆国
Owner RAYCAN TECH CO LTD SU ZHOU
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