TY - GEN
T1 - Design of a Modular SPECT Camera with Improved Spatial Resolution near Edges
AU - Li, Xin
AU - Zubal, George
AU - King, Michael A.
AU - Furenlid, Lars R.
N1 - Funding Information:
The authors would like to thank H. Bradford Barber and Professor Matthew A. Kupinski for discussions and suggestions. This work is partially supported by NIH/NIBIB grants R01-EB022521 and P41-EB002035.
Publisher Copyright:
© 2017 IEEE.
PY - 2018/11/12
Y1 - 2018/11/12
N2 - We are designing a modular SPECT camera for specialized imaging applications. We proposed to use NaI(Tl) as our scintillation crystal whose shape is hexagonal with \sim 100 mm side lengths and > 5 mm thickness. Our target average spatial resolution is \sim 1.5 mm (FWHM) which corresponds to a\sigma (RMSE) of 0.45 mm. We propose putting SiPMs on the edges to help improve the spatial resolution. Our preliminary simulation result shows that with 8 mm crystal thickness, 6 mm light guide, and 37 close-packed photomultiplier tubes (1.0'' diameter), the root mean squared error (RMSE) across the detector plane is 2.84 mm, due to the very high bias and variance in regions close to the edges; By attaching 4 SiPMs on each edge, the RMSE is improved to 1.34 mm; If the SiPMs' window material and coupling medium's refractive index is increased to 1.82, the RMSE is improved to 1.00 mm. We are still optimizing the detector design by tuning the parameters such as thickness of crystal, thickness of light guide, positions of SiPMs on the edges and number of PMTs to achieve the target spatial resolution without a significant trade-off on the detection sensitivity.
AB - We are designing a modular SPECT camera for specialized imaging applications. We proposed to use NaI(Tl) as our scintillation crystal whose shape is hexagonal with \sim 100 mm side lengths and > 5 mm thickness. Our target average spatial resolution is \sim 1.5 mm (FWHM) which corresponds to a\sigma (RMSE) of 0.45 mm. We propose putting SiPMs on the edges to help improve the spatial resolution. Our preliminary simulation result shows that with 8 mm crystal thickness, 6 mm light guide, and 37 close-packed photomultiplier tubes (1.0'' diameter), the root mean squared error (RMSE) across the detector plane is 2.84 mm, due to the very high bias and variance in regions close to the edges; By attaching 4 SiPMs on each edge, the RMSE is improved to 1.34 mm; If the SiPMs' window material and coupling medium's refractive index is increased to 1.82, the RMSE is improved to 1.00 mm. We are still optimizing the detector design by tuning the parameters such as thickness of crystal, thickness of light guide, positions of SiPMs on the edges and number of PMTs to achieve the target spatial resolution without a significant trade-off on the detection sensitivity.
UR - https://www.scopus.com/pages/publications/85058481757
UR - https://www.scopus.com/pages/publications/85058481757#tab=citedBy
U2 - 10.1109/NSSMIC.2017.8532742
DO - 10.1109/NSSMIC.2017.8532742
M3 - Conference contribution
AN - SCOPUS:85058481757
T3 - 2017 IEEE Nuclear Science Symposium and Medical Imaging Conference, NSS/MIC 2017 - Conference Proceedings
BT - 2017 IEEE Nuclear Science Symposium and Medical Imaging Conference, NSS/MIC 2017 - Conference Proceedings
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 2017 IEEE Nuclear Science Symposium and Medical Imaging Conference, NSS/MIC 2017
Y2 - 21 October 2017 through 28 October 2017
ER -