arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2004.12742physics.ins-detphysics.med-ph
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利用多阈值读数重建塑料带的击中时间和击中位置

Hit-time and hit-position reconstruction in strips of plastic scintillators using multi-threshold readouts

N. G. Sharma, M. Silarski, J. Chhokar, E. Czerwinski, C. Curceanu, K. Dulski, K. Farbaniec, A. Gajos, R. Del Grande, M. Gorgol, B. C. Hiesmayr, B. Jasinska, K. … 展开作者

N. G. Sharma, M. Silarski, J. Chhokar, E. Czerwinski, C. Curceanu, K. Dulski, K. Farbaniec, A. Gajos, R. Del Grande, M. Gorgol, B. C. Hiesmayr, B. Jasinska, K. Kacprzak, L. Kaplon, D. Kisielewska, K. Klimaszewski, G. Korcyl, P. Kowalski, N. Krawczyk, W. Krzemien, T. Kozik, E. Kubicz, M. Mohammed, Sz. Niedzwiecki, M. Palka, M. Pawlik-Niedzwiecka, L. Raczynski, J. Raj, S. Sharma, S. Shivani, R. Y. Shopa, M. Skurzok, W. Wislicki, B. Zgardzinska, P. Moskal

摘要:

本文研究了一种重建光子在长闪烁体探测器中的击中位置和击中时间的新方法。本研究的动机是最近发展的正电子发射断层成像扫描仪的基础上塑料散热器。该方法为多电压技术中的信号处理提供了一种新的思路。它基于对记录的信号和存储在库中的同步模型信号之间的相似度的确定。为沿闪烁体长度的一组明确定义的命中位置建立库。使用马氏距离作为两个比较信号之间相似性的度量。使用尺寸为5 × 9 × 300 mm $^3$的两条J-PET原型测量的实验数据验证了该方法。获得的飞行时间(TOF)和空间分辨率分别为325 ps(FWHM)和25 mm(FWHM)。还将TOF分辨率与使用线性拟合方法进行的类似研究的结果进行了比较。最好的TOF分辨率与此方法在四个预定义的阈值水平,这是可比的分辨率从马哈拉诺比斯距离在两个预定义的阈值水平。虽然线性拟合方法的算法比Mahalanobis方法应用起来简单得多,但是Mahalanobis距离的应用需要较低数量的应用阈值水平,并且因此降低了PET扫描仪中使用的电子器件的成本。

英文摘要:

In this article, a new method for the reconstruction of hit-position and hit-time of photons in long scintillator detectors is investigated. This research is motivated by the recent development of the positron emission tomography scanners based on plastic scintillators. The proposed method constitutes a new way of signal processing in Multi-Voltage-Technique. It is based on the determination of the degree of similarity between the registered signals and the synchronized model signals stored in a library. The library was established for a set of well defined hit-positions along the length of the scintillator. The Mahalanobis distance was used as a measure of similarity between the two compared signals. The method was validated on the experimental data measured using two-strips J-PET prototype with dimensions of 5x9x300 mm$^3$. The obtained Time-of-Flight (TOF) and spatial resolutions amount to 325~ps (FWHM) and 25~mm (FWHM), respectively. The TOF resolution was also compared to the results of an analogous study done using Linear Fitting method. The best TOF resolution was obtained with this method at four pre-defined threshold levels which was comparable to the resolution achieved from the Mahalanobis distance at two pre-defined threshold levels. Although the algorithm of Linear Fitting method is much simpler to apply than the Mahalanobis method, the application of the Mahalanobis distance requires a lower number of applied threshold levels and, hence, decreases the costs of electronics used in PET scanner.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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