RT Journal Article
SR Electronic
T1 New Ultra High Resolution LYSODetector for Lower-cost PET-CT and PET-MR
JF Journal of Nuclear Medicine
JO J Nucl Med
FD Society of Nuclear Medicine
SP 1941
OP 1941
VO 57
IS supplement 2
A1 HAIBO WANG
A1 TING LU
A1 Ze Chen
A1 DONGDONG BI
A1 XINYU LV
A1 CHAO WANG
A1 SHAOHUI AN
YR 2016
UL http://jnm.snmjournals.org/content/57/supplement_2/1941.abstract
AB 1941Objectives We developed and built a solid LYSO detector ring for a new uMI PET camera using new 6[asterisk]6 mm2 silicon photomultipliers (SiPM) in anger logic configuration.Methods 1820 blocks distributed in 14 subrings (130 blocks each) constitute the detector system. The prototype blocks with dimensions of 2.76 mm x 2.59 mm x 18 mm (7 x 8 array) were built using 4 square SiPMs. The SiPMs used in this work were Sensl C series, which provided good timing resolution and ultra-low noise. We used special circuit to reduce the dead time of SiPM signal to get good performance at high count rate. By implementing new design, materials and techniques, testing the detectors response and, measuring the timing resolution, we can optimize detector performance. List-mode data were acquired using Ga-68 source with UIH high yield pileup-event recovery (HYPER) electronics and data acquisition software.Results A typical block is presented in this study. This block has a packing fraction of 95%. All 56 crystal detectors are clearly decoded, peak-to-valley ratio of 2.7, energy resolution of 11.7% at 511 keV. Average coincidence timing resolution (CRT) of 484-ps (FWHM) was achieved by crystal to crystal.Conclusions This new block design shows the feasibility of high resolution PET-CT and PET-MR detector ring using the lower cost SiPM as an alternative to the more expensive position sensitive PMTs.