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Scintillation in Liquid Xenon for Gamma-Ray Medical Imaging: From Single Time-over-Threshold to
Quentin Lainé1,2, Nicolas Beaupere2, Dingbang Cai2
1Lab-STICC, Optics Department, IMT-Atlantique, CS 83818, Cedex 3, F-29238 Brest, France.
Sensors (Basel, Switzerland)
|September 14, 2024
Summary
A new method for liquid xenon medical imaging prototypes improves light event acquisition. The Multi-Time-Over-Threshold (MTOT) method enhances photoelectrons reconstruction and timing precision for better imaging system performance.
Area of Science:
- Medical Physics
- Nuclear Imaging
- Particle Detectors
Background:
- Liquid xenon detectors are crucial for medical nuclear imaging.
- Existing methods like Single-Time-Over-Threshold (STOT) have limitations in precision.
- Advancements in light event acquisition are needed for improved imaging capabilities.
Purpose of the Study:
- To present a novel light event acquisition chain for a liquid xenon prototype.
- To evaluate the performance of the Multi-Time-Over-Threshold (MTOT) method.
- To demonstrate the advantages of MTOT over STOT for medical nuclear imaging.
Main Methods:
- Implementation of the Multi-Time-Over-Threshold (MTOT) method in a three-gamma liquid xenon prototype.
- Precise determination of vacuum ultraviolet (VUV) photon counts and arrival times per photomultiplier tube (PMT).
- Comparison of MTOT performance against the Single-Time-Over-Threshold (STOT) method using experimental and simulated data.
Main Results:
- MTOT achieved a 70% improvement in reconstructing photoelectrons (PEs).
- Enhanced precision in arrival time estimation by 20-30% compared to STOT.
- Validated performance through both experimental and simulated results.
Conclusions:
- The MTOT method offers significant improvements in light event acquisition for liquid xenon detectors.
- These advancements are crucial for upgrading medical imaging systems like XEMIS2.
- The enhanced precision will lead to superior performance in medical nuclear imaging applications.
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