MCP-PMT timing at low light intensities with a DRS4 evaluation board
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Abstract
Positron emission tomography (PET) is one of the most important diagnostic tools in medicine, allowing three-dimensional imaging of functional processes in the body. It is based on a detection of two gamma rays with an energy of 511 keV originating from the point of annihilation of the positron emitted by a radio-labeled agent. By measuring the difference of the arrival times of both annihilation photons it is possible to localize the tracer inside the body. Gamma rays are normally detected by a scintillation detector, whose timing accuracy is limited by a photomultiplier and a scintillator. By replacing a photo sensor with a microchannel plate PMT (MCP-PMT) and a scintillator with Cherenkov radiator, it is possible to localize the interaction position to the cm level. In a pioneering experimental study with Cherenkov detectors using PbF 2 crystals and microchannel plate photomultiplier tubes MCP-PMT a time resolution better than 100 ps was achieved. In this work a DRS4 digital ring sampler chip was used to read out single photon output signals from two different MCP-PMTs (Hamamatsu R3809 and Burle 85001) with a sampling rate of 5×109 samples/s. The digitized waveforms were analyzed and a comparison between the two detectors timing response was made. The time resolutions achieved were (161 ± 2.21) ps and (220 ± 2.63) ps FWHM for the Hamamatsu and Burle MCP-PMT respectively. No significant variances were observed in the study of the behavior of the FWHM when both MCP-PMT were scanned.
Article Details
How to Cite
Consuegra, D., Korpar, S., Pestotnik, R., Križan, P., & Dolenec, R. (2019). MCP-PMT timing at low light intensities with a DRS4 evaluation board. Nucleus, (65), 42-46. Retrieved from http://nucleus.cubaenergia.cu/index.php/nucleus/article/view/678
Section
Ciencias Nucleares
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[4] DOLENEC R, CHANGANI H, KORPAR S, et. al. Time-of-flight with photonics multi-channel MCP-PMT using MCP signal. IEEE Nuclear Science Symposium Conference Record. 2009. http://ieeexplore.ieee.org/stamp/stamp.jsp?arnumber=5402278.
[5] KORPAR S, DOLENEC R, KRIŽAN P, PESTOTNIK R, STANOVNIKD A. Study of TOF PET using Cherenkov light. Physics Procedia. 2012; 37: 1531-1536. http://www.sciencedirect.com/science/article/pii/ S1875389212018718.
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[7] KRIŽAN P, ADACHI I, FRATINA S, et. al. Tests of the Burle 85011 64-anode MCP-PMT as a detector of Cherenkov photons. Nucl Instrum Meth in Phys Res A. 2006; 567: 124-128. http://www.sciencedirect.com/science/article/pii/S0168900206008898.
[8] BITOSSI M, PAOLETTI R, TESCARO D. Ultra-fast sampling and data acquisition using the drs4 waveform digitizer. IEEE Transactions on Nucl Science. 2016; 63. http://ieeexplore.ieee.org/stamp/stamp.jsp?arnumber=7488281.
[9] RAN A, BIN C, Y-FEN L, WEI K, RITT S. A new positron annihilation lifetime spectrometer based on DRS4 waveform digitizing board. Nucl Instrum and Meth in Chinese Physics C. 2014; 38. http://staff.ustc.edu.cn/~bjye/ye/papers/1674-1137_38_5_056001.pdf.
[10] HU W, CHOI Y, HONG K, et. al. A simple and improved digital timing method for positron emission tomography. Nucl Instrum and Meth in Phys Res A. 2010; 622: 219-224. http://med.stanford.edu/miil/publications/files/151_PUB.pdf.
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[12] AUFFRAY E, FRISCH B, GERACI F, GHEZZI A, et. al. A comprehensive systematic study of coincidence time resolution and light yield using scintillators of different size and wrapping. IEEE Transactions on Nuclear Science. 2013; 60: 3163. http://ieeexplore.ieee.org/stamp/stamp.jsp?arnumber=6566141