Device of acquiring annihilation event occurrence time and detector

A technology of event occurrence and time measurement, which is applied in the direction of instruments, electrical components, pulse generation, etc., can solve the problems of poor time resolution, affecting the effect of PET imaging, and the inability to accurately obtain the occurrence time of annihilation events, so as to achieve accurate occurrence time and avoid inaccurate accurate effect

Active Publication Date: 2017-02-22
SHENYANG INTELLIGENT NEUCLEAR MEDICAL TECH CO LTD
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Problems solved by technology

[0008] The time of occurrence of annihilation events cannot be accurately obtained in the existing technology, and the resolution of time is poor, which affects the effect of PET imaging

Method used

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  • Device of acquiring annihilation event occurrence time and detector
  • Device of acquiring annihilation event occurrence time and detector
  • Device of acquiring annihilation event occurrence time and detector

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Experimental program
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Embodiment Construction

[0042] The existing time discriminator (LED, leading-edge timing discriminator), that is, the leading edge discriminator, its principle block diagram is as follows figure 2 shown.

[0043] After the multi-channel photoelectric pulse signals of the detector are summed by the summer 100, they are divided into two channels of signals. One signal is input to the first input terminal of the first comparator 200, and the second input terminal of the first comparator 200 is connected to a high threshold, and the high threshold is used to filter low energy and noise. When the photoelectric pulse signal exceeds the high threshold, the output of the first comparator 200 jumps and is input to the flip-flop 500 . The other signal is input to the first input terminal of the second comparator 300 , and the second input terminal of the second comparator 300 is connected to a low threshold value, which is used to discriminate the timing of the leading edge of the photoelectron pulse. When ...

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Abstract

The invention provides a device of acquiring annihilation event occurrence time and a detector. The device comprises a trigger, a time measuring circuit, a summator and a first comparator used for high threshold comparison. The summator is used for performing summation of multipath photoelectron pulse signals generated by photons and inputting the summation result to the first input end of the first comparator. The second input end of the first comparator is connected with the high threshold. The output result of the first comparator acts for identifying an annihilation event. The device also comprises a time identifying path which is used for identifying annihilation time corresponding to each path of electron pulse signals. The identifying signals first identifying the annihilation time and the output signals of the first comparator are combined to activate the trigger. The trigger is used for triggering the time measuring circuit to output time information. The annihilation event occurrence time can be more accurately acquired and the time resolution is higher.

Description

technical field [0001] The invention relates to the technical field of medical equipment, in particular to a device and a detector for acquiring the occurrence time of an annihilation event. Background technique [0002] Positron Emission Tomography (PET, Positron Emission Tomography) is a nuclear physics detection technique that utilizes positron decay nuclide radiopharmaceutical imaging. By detecting the 511keV energy γ-photon pairs emitted in opposite directions produced by the annihilation of electron-positrons (Annihilation), the annihilation events are reconstructed according to the line statistical projection distribution. [0003] Subsequently, the time-of-flight method (TOF, Time-Of-Flight) began to be applied to PET, which measures the time difference between the gamma photon pairs arriving at the detector, and estimates the position of the annihilation event on the coincidence line according to the speed of light. [0004] In a PET system, the detector consists o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01T1/24H03K3/3562H03L7/06G06F7/575H03K5/24
CPCG01T1/24G06F7/575H03K3/3562H03K5/24H03L7/06
Inventor 张军杨龙赵玉秋宁鹏於晓龙
Owner SHENYANG INTELLIGENT NEUCLEAR MEDICAL TECH CO LTD
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