Share Email Print
cover

Proceedings Paper

Single-photon spatial and energy resolution enhancement of a columnar CsI(Tl)/EMCCD gamma-camera using maximum-likelihood estimation
Format Member Price Non-Member Price
PDF $14.40 $18.00
cover GOOD NEWS! Your organization subscribes to the SPIE Digital Library. You may be able to download this paper for free. Check Access

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
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)
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)


Published in SPIE Proceedings Vol. 6142:
Medical Imaging 2006: Physics of Medical Imaging
Michael J. Flynn; Jiang Hsieh, Editor(s)

© SPIE. Terms of Use
Back to Top