
Proceedings Paper
Single-photon spatial and energy resolution enhancement of a columnar CsI(Tl)/EMCCD gamma-camera using maximum-likelihood estimationFormat | Member Price | Non-Member Price |
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Paper Abstract
We examined the spatial resolution of a columnar CsI(Tl), single-photon imaging system using an approach that
estimates the interaction position to better than the spread of the light distribution. A columnar scintillator was directly
coupled to a 512×512 electron multiplying CCD (EMCCD) camera (16 μm pixels) binned at 2×2 to sample at 32 μm
pixels. Optical photons from gamma-ray/scintillator interactions are sampled over multiple pixels. Resultant images
show clusters of signal at the original interaction site, clusters from Cs and I K x-rays up to several hundred microns
away, and clusters from collimator K x-rays. Also evident are depth-of-interaction effects which result in a broadening
of the light distribution. These effects result in a degradation of spatial and energy resolution. Cluster pixel data was
processed to better estimate the interaction position within the initial interaction cluster. Anger (centroid) estimation of
individual gamma-ray events yielded spatial resolutions better than 100 μm; a result previously achievable only with
pixellated semiconductor detector arrays. After proper calibration, depth-of-interaction (DOI) effects are corrected by
performing maximum-likelihood 3D position and energy estimation of individual gamma-ray interactions.
Paper Details
Date Published: 2 March 2006
PDF: 10 pages
Proc. SPIE 6142, Medical Imaging 2006: Physics of Medical Imaging, 61421T (2 March 2006); doi: 10.1117/12.652650
Published in SPIE Proceedings Vol. 6142:
Medical Imaging 2006: Physics of Medical Imaging
Michael J. Flynn; Jiang Hsieh, Editor(s)
PDF: 10 pages
Proc. SPIE 6142, Medical Imaging 2006: Physics of Medical Imaging, 61421T (2 March 2006); doi: 10.1117/12.652650
Show Author Affiliations
Brian W. Miller, College of Optical Sciences, Univ. of Arizona (United States)
H. Bradford Barber, College of Optical Sciences, Univ. of Arizona (United States)
Harrison H. Barrett, College of Optical Sciences, Univ. of Arizona (United States)
H. Bradford Barber, College of Optical Sciences, Univ. of Arizona (United States)
Harrison H. Barrett, College of Optical Sciences, Univ. of Arizona (United States)
Irina Shestakova, Radiation Monitoring Devices, Inc. (United States)
Bipin Singh, Radiation Monitoring Devices, Inc. (United States)
Vivek V. Nagarkar, Radiation Monitoring Devices, Inc. (United States)
Bipin Singh, Radiation Monitoring Devices, Inc. (United States)
Vivek V. Nagarkar, Radiation Monitoring Devices, Inc. (United States)
Published in SPIE Proceedings Vol. 6142:
Medical Imaging 2006: Physics of Medical Imaging
Michael J. Flynn; Jiang Hsieh, Editor(s)
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