Title :
4π Compton imaging using a 3-D position-sensitive CdZnTe detector via weighted list-mode maximum likelihood
Author :
Lehner, Carolyn E. ; He, Zhong ; Zhang, Feng
Author_Institution :
Univ. of Michigan, Ann Arbor, MI, USA
Abstract :
In this paper, we describe a 4π Compton imager composed of a single 15 mm × 15 mm × 10 mm CdZnTe detector. Full 4π images are reconstructed via list-mode maximum likelihood (ML). A new weighting method for ML reconstruction is proposed in which the contributions of small-uncertainty sequences are enhanced relative to sequences with large uncertainties. The new reconstruction method is compared with traditional ML techniques for measured imaging data. The 4π Compton imager has a measured intrinsic imaging efficiency of nearly 2% and an imaging resolution using the weighted ML reconstruction method of 17° at 662 keV after 10 iterations.
Keywords :
Compton effect; gamma-ray detection; image reconstruction; maximum likelihood sequence estimation; particle track visualisation; position sensitive particle detectors; semiconductor counters; 10 mm; 15 mm; 3D position-sensitive CdZnTe detector; 4π Compton imaging; Compton camera; cadmium zinc telluride; full 4-π images; gamma-ray imaging; gamma-ray tracking; image reconstruction; imaging resolution; measured intrinsic imaging efficiency; small-uncertainty sequences; weighted list-mode maximum likelihood; weighting method; Energy resolution; Gamma ray detection; Gamma ray detectors; Image reconstruction; Maximum likelihood detection; Maximum likelihood estimation; Optical imaging; Position sensitive particle detectors; Reconstruction algorithms; Scattering;
Journal_Title :
Nuclear Science, IEEE Transactions on
DOI :
10.1109/TNS.2004.832573
