Time correction method and device for multiplexed readout PET detector

By employing a time correction method for multiplexed readout PET detectors, processing digital waveforms from different channels, and establishing a three-dimensional index, the impact of crystal and electronic circuit delay time on time information measurement is resolved, thereby improving the time resolution and imaging quality of the PET system.

CN120884310BActive Publication Date: 2026-01-23UNIV OF SCI & TECH OF CHINA
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Patent Information

Application Number
CN202511413799.1
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2025-09-29
Publication Date
2026-01-23
Estimated Expiration
2045-09-29

AI Technical Summary

Technical Problem

The temporal resolution of traditional multiplexed readout PET detectors is affected by differences in crystal array fabrication processes and the depth of interaction between gamma photons and the crystal, leading to inaccurate temporal information measurement and affecting PET imaging quality.

Method used

By processing the digital waveforms of different channels after multiplexing in a coincident event, a three-dimensional index is established to calculate and correct the detector signal delay, reduce the impact of the delay time of the crystal and electronic circuit, and use a three-dimensional index-delay time lookup table for time correction.

Benefits of technology

It improves the temporal accuracy and imaging quality of the PET detector, reduces the degradation of the system's temporal resolution, and enhances the image signal-to-noise ratio.

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Abstract

The application discloses a time correction method and device for a multiplexed readout PET detector, aiming at a coincidence event of a PET detector, extracting the amplitude of a signal, calculating the hit position and DOI by using a double-end four-corner readout 8-channel output signal; extracting the time information of the 8-channel output signal, using the amplitude for weighting, obtaining the original time of a coincidence event particle reaching two detectors; establishing a three-dimensional index, so that the original time of the two detectors is equal after subtracting the respective corresponding delay time; establishing an overdetermined equation group about the corresponding delay time of the two detectors, obtaining the delay time corresponding to each three-dimensional index of the two detectors; establishing a three-dimensional index-delay time lookup table, and subtracting the delay time from the original time of each event to obtain the corrected time. The method and device correct the detector signal delay by processing the different channel digital waveforms after multiplexing in the coincidence event, and improve the time precision and imaging quality of the PET.
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