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Evaluation of monolithic crystal detector with dual-ended readout utilizing multiplexing method
Xiangtao Zeng1,2,3,4, Zhiming Zhang1,2,3,4, Daowu Li1,3,4
1Beijing Engineering Research Centre of Radiographic Techniques and Equipment, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, People's Republic of China.
Physics in Medicine and Biology
|March 14, 2024
Summary
This study introduces a dual-ended readout monolithic crystal detector for positron emission tomography (PET). The new detector achieves excellent spatial resolution using channel multiplexing and depth-of-interaction methods, improving PET system performance.
Area of Science:
- Medical Imaging
- Detector Physics
- Nuclear Instrumentation
Background:
- Monolithic crystal detectors offer superior depth-of-interaction (DOI) resolution and detection efficiency for positron emission tomography (PET).
- Developing advanced detectors is crucial for enhancing PET system sensitivity and spatial resolution.
Purpose of the Study:
- To construct and evaluate a dual-ended readout monolithic crystal detector using channel multiplexing.
- To improve spatial and DOI resolution for PET applications.
Main Methods:
- Utilized two 12x12 silicon photomultiplier (SiPM) arrays with channel multiplexing for signal readout.
- Compared center of gravity (COG) methods with thresholding and employed a convolutional neural network (CNN) for 2D reconstruction.
- Developed a DOI resolution method using mutual information from both SiPM ends and simulated effects with GEANT4.
Main Results:
- Achieved 12.5% energy resolution at 29 V SiPM operational voltage.
- Obtained 0.90 mm FWHM 2D spatial resolution with thresholding in COG and 0.80 mm FWHM using CNN.
- Demonstrated 1.36 mm FWHM average DOI resolution and reduced edge effects with surface treatments.
Conclusions:
- A threshold in the COG method and dual-ended readout significantly enhance spatial resolution in monolithic crystal detectors.
- This technology advancement supports the development of PET systems with improved sensitivity and spatial resolution.
