TY - JOUR
T1 - Performance studies towards a TOF-PET sensor using Compton scattering at plastic scintillators
AU - Kuramoto, M.
AU - Nakamori, T.
AU - Gunji, S.
AU - Kamada, K.
AU - Shoji, Y.
AU - Yoshikawa, A.
AU - Aoki, T.
N1 - Funding Information:
This work was supported by JSPS KAKENHI Grant Number JP16H06238. A part of this research is based on the Cooperative Research Project of Research Center for Biomedical Engineering, Ministry of Education, Culture, Sports, Science and Technology.
Publisher Copyright:
© 2018 IOP Publishing Ltd and Sissa Medialab.
PY - 2018/1
Y1 - 2018/1
N2 - We have developed a sensor head for a time-of-flight (TOF) PET scanner using plastic scintillators that have a very fast timing property. Given the very small cross section of photoelectric absorption in plastic scintillators at 511 keV, we use Compton scattering in order to compensate for detection efficiency. The detector will consist of two layers of scatterers and absorbers which are made of plastic and inorganic scintillators such as GAGG:Ce, respectively. Signals are read by monolithic Multi Pixel Photon Counters, and with energy deposits and interaction time stamps are being acquired. The scintillators are built to be capable of resolving interaction position in three dimensions, so that our system has also a function of depth-of-interaction (DOI) PET scanners. TOF resolution of ∼ 200 ps (FWHM) is achieved in both cases of using the leading-edge discriminator and time-walk correction and using a configuration sensitive to DOI. Both the position resolution and spectroscopy are demonstrated using the prototype data acquisition system, with Compton scattering events subsequently being obtained. We also demonstrated that the background rejection technique using the Compton cone constraint could be valid with our system.
AB - We have developed a sensor head for a time-of-flight (TOF) PET scanner using plastic scintillators that have a very fast timing property. Given the very small cross section of photoelectric absorption in plastic scintillators at 511 keV, we use Compton scattering in order to compensate for detection efficiency. The detector will consist of two layers of scatterers and absorbers which are made of plastic and inorganic scintillators such as GAGG:Ce, respectively. Signals are read by monolithic Multi Pixel Photon Counters, and with energy deposits and interaction time stamps are being acquired. The scintillators are built to be capable of resolving interaction position in three dimensions, so that our system has also a function of depth-of-interaction (DOI) PET scanners. TOF resolution of ∼ 200 ps (FWHM) is achieved in both cases of using the leading-edge discriminator and time-walk correction and using a configuration sensitive to DOI. Both the position resolution and spectroscopy are demonstrated using the prototype data acquisition system, with Compton scattering events subsequently being obtained. We also demonstrated that the background rejection technique using the Compton cone constraint could be valid with our system.
KW - Gamma camera, SPECT, PET PET/CT, coronary CT angiography (CTA)
KW - Gamma detectors (scintillators, CZT, HPG, HgI etc)
KW - Scintillators and scintillating fibres and light guides
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U2 - 10.1088/1748-0221/13/01/C01008
DO - 10.1088/1748-0221/13/01/C01008
M3 - Article
AN - SCOPUS:85041862466
VL - 13
JO - Journal of Instrumentation
JF - Journal of Instrumentation
SN - 1748-0221
IS - 1
M1 - C01008
ER -