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A method and device for judging a coincidence event

A technology for determining methods and events, applied in the medical field, can solve the problems of inaccurate determination and failure to consider the length of the line of conformity

Active Publication Date: 2016-07-27
SHENYANG INTELLIGENT NEUCLEAR MEDICAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Since the lengths of coincidence lines in the same detection device are different, the judging criteria for coincidence events on different coincidence lines, that is, the size of the coincidence time window should be different. However, in the prior art, a fixed coincidence time window is preset as the All the judging criteria of the coincident event in the detection device are obvious. The scheme of the prior art does not consider the factor of the length of the coincident line, so the judgment of the coincident event is inaccurate

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  • A method and device for judging a coincidence event
  • A method and device for judging a coincidence event
  • A method and device for judging a coincidence event

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Embodiment 1

[0056] refer to Figure 4 , Figure 4 is a schematic diagram of the event to be determined, Figure 4 The event in a is a true coincidence event, the two γ photons detected in a come from the same annihilation event, and the two γ photons did not interact with the space medium before reaching the detection device, so this The event information generated after two gamma photons hit the crystal of the detection device contains precise spatial position information. and Figure 4 The event in b is a scattering coincidence event. Although the two gamma photons detected in b originate from the same annihilation event, at least one of the two gamma photons is scattered and deviates from the original flight direction, so the spatial position information contained in the matching event generated in b is wrong. Figure 4 The event in c is a random coincidence event, the two γ photons detected in c are not from the same annihilation event, but from two almost simultaneous annihilatio...

Embodiment 2

[0084] refer to Figure 6 , Figure 6 It is a flow chart of the coincidence event determination method provided in this embodiment, and the method may include:

[0085] Step 601: Obtain a matching time window configuration table, the matching time window configuration table including the corresponding relationship between the spatial position of the matching line and the matching time window.

[0086] In this embodiment, the matching time window configuration table includes the corresponding relationship between the matching line space position and the matching time window. Specifically, the method for obtaining the matching time window configuration table may include:

[0087] Firstly, the spatial position of the coincident line and the length of the coincident line are obtained;

[0088] Secondly, according to the length, determine the coincidence time window corresponding to the spatial position of the coincidence line;

[0089] Finally, a matching time window configurat...

Embodiment 3

[0112] refer to Figure 8 , Figure 8 The structural diagram of the coincidence event determination device provided in this embodiment, the device may include:

[0113] The first acquisition module 801 is configured to acquire a conforming time window configuration table, the conforming time window configuration table including the corresponding relationship between the spatial position of the conforming line and the conforming time window;

[0114] A receiving module 802, configured to receive event information of any two events, where the event information includes event occurrence time and event occurrence location;

[0115] The first determining module 803 is configured to determine the coincident line space positions of the two events according to the event occurrence positions of the two events;

[0116] The second acquiring module 804 is configured to acquire the coincident time window corresponding to the spatial position of the coincidence line in the coincidence ti...

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Abstract

The invention discloses a method and device for determining coincidence events. The method comprises the following steps: acquiring a coincidence time window configuration table which comprises a corresponding relationship between a coincidence line space position and a coincidence time window; receiving information of any two events, wherein the event information comprises event occurrence time and event occurrence positions; determining the coincidence line space position of the two events according to the event occurrence position of the events; acquiring a coincidence time window which corresponds to the coincidence line space position; determining occurrence time difference of the two events according to the occurrence time of the two events; and determining the two events as coincidence events when the occurrence time difference is smaller than the coincidence time window. The influence of coincidence line length on the judgment accuracy of the coincidence events is considered, and the corresponding relationship between the coincidence line space position and the coincidence time window is acquired in advance, so that the coincidence events are accurately judged according to the corresponding relationship. Compared with the prior art, the method for determining the coincidence events is high in accuracy.

Description

technical field [0001] The present invention relates to the field of medical technology, in particular to a method and device for judging a coincidence event. Background technique [0002] Positron Emission Tomograph (PET) system is an advanced molecular imaging diagnostic equipment in today's medical field. Because it uses radionuclide as a tracer, it is also called nuclear medicine equipment. The PET system is currently widely used in the detection of early tumor lesions, the evaluation of the recovery effect of radiotherapy and chemotherapy, and the examination of diseases in the heart, brain and nerve systems, and has irreplaceable advantages in some diagnostic fields. [0003] Select a FDG (FluoroDeoxyGlucose, deoxyglucose) label containing a positron nuclide as a tracer and inject it into the subject. metabolic activity. During this process, the positron nuclide in the tracer will release positron e+, and after the released positron e+ moves a certain distance in the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F19/00
Inventor 杨龙高鹏尹柱霞
Owner SHENYANG INTELLIGENT NEUCLEAR MEDICAL TECH CO LTD