NDLI: Large-Area SiPM Pixels (LASiPs): A cost-effective solution towards compact large SPECT cameras

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Large-Area SiPM Pixels (LASiPs): A cost-effective solution towards compact large SPECT cameras

Content Provider	Scilit
Author	Guberman, D. Paoletti, R. Rugliancich, A. Wunderlich, C. Passeri, A.
Copyright Year	2021
Description	Journal: Physica Medica Single Photon Emission Computed Tomography (SPECT) scanners based on photomultiplier tubes (PMTs) are still largely employed in the clinical environment. A standard camera for full-body SPECT employs $~50-100 PMTs of 4-8 cm diameter and is shielded by a thick layer of lead, becoming a heavy and bulky system that can weight a few hundred kilograms. The volume, weight and cost of a camera can be significantly reduced if the PMTs are replaced by silicon photomultipliers (SiPMs). The main obstacle to use SiPMs in full-body SPECT is the limited size of their sensitive area. A few thousand channels would be needed to fill a camera if using the largest commercially-available SiPMs of 6 \times 6 $mm^{2}$. As a solution, we propose to use Large-Area SiPM Pixels (LASiPs), built by summing individual currents of several SiPMs into a single output. We developed a LASiP prototype that has a sensitive area 8 times larger than a 6 \times 6 $mm^{2}$ SiPM. We built a proof-of-concept micro-camera consisting of a 40 \times 40 \times 8 $mm^{3}$ NaI(Tl) crystal coupled to 4 LASiPs. We evaluated its performance in a central region of15\times15 $mm^{2}$, where we were able to reconstruct images of a$ ^{99m}$Tc capillary with an intrinsic spatial resolution of~2 mm and an energy resolution of~11.6% at 140 keV. We used these measurements to validate Geant4 simulations of the system. This can be extended to simulate a larger camera with more and larger pixels, which could be used to optimize the implementation of LASiPs in large SPECT cameras. We provide some guidelines towards this implementation.$
Related Links	http://www.physicamedica.com/article/S1120179721000697/pdf
Ending Page	184
Page Count	14
Starting Page	171
ISSN	11201797
DOI	10.1016/j.ejmp.2021.01.066
Journal	Physica Medica
Volume Number	82
Language	English
Publisher	Elsevier BV
Publisher Date	2021-02-25
Access Restriction	Open
Subject Keyword	Journal: Physica Medica Silicon Photomultiplier (sipm)
Content Type	Text
Resource Type	Article
Subject	Radiology, Nuclear Medicine and Imaging Physics and Astronomy Biophysics

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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