A compact PET detector module using SiPMs and MVT digitizers

Liu, Xiang; Xi, Daoming; Zeng, Chen; Liu, Wei; Chen, Rui; Mei, Xiongze; Hua, Yiexuan; Feng, Xiaoyao; Jie, Wu; Kim, Heejong; Xiao, Peng; Kao, Chien-Min; Xie, Qingguo

doi:10.1186/2197-7364-2-s1-a7

Cited by 2 publications

(1 citation statement)

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“…However, the traditional MVT could still be thought as some times sacrificing its accuracy on energy determination in some degree. Former works on improving the detector performance focused on physical level such as SiPM (silicon photomultiplier) arrangement [23] and detector design [24]. For the traditional MVT detectors, the concept which uses several thresholds and one fixed model is changed in this work.…”

Section: Introductionmentioning

confidence: 99%

Potential Advantages of Peak Picking Multi-Voltage Threshold Digitizer in Energy Determination in Radiation Measurement

Zhu¹,

Mei²,

Su³

et al. 2021

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The Multi-voltage Threshold (MVT) method, which samples the signal by certain reference voltages, has been well developed as being adopted in pre-clinical and clinical digital positron emission tomography(PET) system. To improve its energy measurement performance, we propose a Peak Picking MVT(PP-MVT) Digitizer in this paper. Firstly, a sampled Peak Point(the highest point in pulse signal), which carries the values of amplitude feature voltage and amplitude arriving time, is added to traditional MVT with a simple peak sampling circuit. Secondly, an amplitude deviation statistical analysis, which compares the energy deviation of various reconstruction models, is used to select adaptive reconstruction models for signal pulses with different amplitudes. After processing 30,000 randomly-chosen pulses sampled by the oscilloscope with a 22 𝑁𝑎 point source, our method achieves an energy resolution of 17.50% within a 450-650 KeV energy window, which is 2.44% better than the result of traditional MVT with same thresholds; and we get a count number at 15225 in the same energy window while the result of MVT is at 14678. When the PP-MVT involves less thresholds than traditional MVT, the advantages of better energy resolution and larger count number can still be maintained, which shows the robustness and the flexibility of PP-MVT Digitizer. This improved method indicates that adding feature peak information could improve the performance on signal sampling and reconstruction, which canbe proved by the better performance in energy determination in radiation measurement.

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Section: Introductionmentioning

confidence: 99%