Real-time calibration method for PET detector energy peak position drifting

A calibration method and peak position drift technology, applied in the direction of measuring devices, radiation measurement, X / γ / cosmic radiation measurement, etc., can solve the problem of energy peak position drift, gain value increase, SiPM temperature can not be kept at a certain level Temperature and other issues to achieve the effect of improving the signal-to-noise ratio, increasing the transmission rate, and suppressing the proportion of scattering events

Active Publication Date: 2020-12-11
FMI MEDICAL SYST CO LTD
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Problems solved by technology

[0004] However, the performance of SiPM is significantly affected by temperature. When the temperature increases, the gain value of SiPM decreases, resulting in a left shift of the energy peak; and when the temperature decreases, the gain value of SiPM increases, resulting in a right shift of the energy peak.
Whether the energy peak shifts to the left or to the right, it will affect the proportion of scattering coincidence events, thereby affecting the signal-to-noise ratio of PET images
[0005] In the prior art, the method for dealing with the drift of the energy peak position wit

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  • Real-time calibration method for PET detector energy peak position drifting
  • Real-time calibration method for PET detector energy peak position drifting
  • Real-time calibration method for PET detector energy peak position drifting

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[0030] The invention is described in further detail below in combination with embodiments.

[0031] This embodiment proposes a real-time calibration method for energy peak drift of PET detector. The method is realized based on the way that the upper computer directly loads the updated energy calibration table. The energy calibration table at least includes detector module information and energy peak offset coefficient peak_ per_ Temp, energy calibration temperature information t0 and energy peak position baseline coefficient b, due to detector module information and energy peak position offset coefficient peak_ per_ Temp and energy calibration temperature information t0 are determined in the calibration stage (mainly the determination of energy peak position offset coefficient, and the detector module information and energy calibration temperature information are determined according to the nature of the equipment). Therefore, the update of energy calibration table in the use stag...

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Abstract

The invention relates to the technical field of medical imaging equipment, in particular to a real-time calibration method for PET detector energy peak position drifting, which is based on an upper computer loading energy calibration table and comprises the following steps of acquiring energy peak position offset coefficients peak_per_temp of all detector modules in a system, and obtaining the temperature difference between the temperatures T of all the detector modules collected at present and the temperature T0 when energy calibration is realized, updating the energy peak position baseline B, and realizing energy peak position drift calibration of all the detector modules of the PET system, so that the energy peak positions of all the detector modules reach the target energy peak positions, and therefore, according to the technical scheme, the scattering event proportion caused by energy peak drifting can be effectively suppressed, so that the transmission rate of effective events iseffectively improved, and the effect of improving the signal-to-noise ratio of the PET image is achieved.

Description

technical field [0001] The invention relates to the technical field of medical imaging equipment, in particular to a real-time calibration method for energy peak position drift of a PET detector. Background technique [0002] Positron Emission Tomography (PET, Positron Emission Tomography) requires the injection of a radioactive tracer before the examination. The tracer can be metabolized by human tissues. Compared with normal tissues, tumors have a higher metabolic level. The principle of PET imaging is: the decay of the tracer produces positrons, and the annihilation of positrons and negative electrons emits two photon pairs with opposite directions and equal energy. Each photon flies at the speed of light. After the detector detects the photon pair, a series of signals processed to reconstruct images with clinical diagnostic significance. [0003] If a pair of gamma photons detected by the detector within a time window come from the same annihilation, the event is called...

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Application Information

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IPC IPC(8): G01T7/00G01T1/29
CPCG01T7/005G01T1/2985
Inventor 叶宏伟吴国城章波波黄振强
Owner FMI MEDICAL SYST CO LTD
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