用于脉冲采样的新型峰值采集多电压阈值数字转换器

IF 4.6 Q1 RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING
Yiqing Ling;Ao Qiu;Lin Wan;Fei Wang;Kezhang Zhu;Yeping Zhang;Qingguo Xie
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引用次数: 0

摘要

多电压阈值(MVT)方法利用比较器和时间数字转换器,在闪烁脉冲越过电压阈值时采集其样本,并利用先前的模型恢复脉冲。它是粒子物理学应用中的一种多功能脉冲数字化方法,包括正电子发射断层扫描(PET)和质子治疗验证。在这些应用中,MVT 方法的性能对电压阈值设置很敏感,如果没有选择优化脉冲恢复的电压阈值,就会导致能量分辨率(ER)下降。在本文中,我们提出了一种采峰 MVT(PP-MVT)方法,它能获取脉冲峰值的时间和电压,并利用 MVT 样本和峰值信息恢复脉冲。基于从 LYSO/SiPM PET 探测器获取的数据集,我们评估了两种方法在四种典型电压阈值设置下的性能。结果表明,该方法实现的最差ER为13.2%@511 keV,而MVT方法实现的最差ER为16.3%@511 keV。此外,我们还初步实现了一个单通道峰值拾取电路,成功捕捉到了闪烁脉冲的峰值电压。在此电路的基础上,我们目前正在开发一个 36 通道 PP-MVT 数字转换器,其中的读出单元是多路复用的,从而以很小的额外硬件复杂性提高了 PET 系统的 ER。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
A Novel Peak Picking Multi-Voltage Threshold Digitizer for Pulse Sampling
The multi-voltage threshold (MVT) method employs comparators and time-to-digital converters to acquire the samples of a scintillation pulse when it crosses voltage thresholds and recovers the pulse using a prior model. It serves as a versatile pulse digitizing method in particle physics applications, including positron emission tomography (PET) and proton therapy verification. In these applications, the performance of the MVT method is sensitive to voltage threshold settings, leading to deteriorating energy resolution (ER) if the voltage thresholds are not selected for optimized pulse recovery. In this article, we propose a peak-picking MVT (PP-MVT) method that acquires the time and voltage of a pulse peak and recovers the pulse with MVT samples and peak information. Based on a dataset acquired from an LYSO/SiPM PET detector, we evaluate the performance of the two methods under four typical voltage threshold settings. The results show that the worst ER achieved by this method is 13.2%@511 keV, while that achieved by the MVT method is 16.3%@511 keV. Moreover, we implement a preliminary 1-channel peak-picking circuit, which has successfully captured the peak voltages of scintillation pulses. Based on this circuit, we are currently developing a 36-channel PP-MVT digitizer, where the readout unit is multiplexed, thus improving the ER of PET systems with little extra hardware complexity.
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来源期刊
IEEE Transactions on Radiation and Plasma Medical Sciences
IEEE Transactions on Radiation and Plasma Medical Sciences RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING-
CiteScore
8.00
自引率
18.20%
发文量
109
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