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Phys Med Biol. 2011 Mar 21;56(6):1563-84. doi: 10.1088/0031-9155/56/6/004. Epub 2011 Feb 18.

Study of a high-resolution, 3D positioning cadmium zinc telluride detector for PET.

Author information

1
Department of Electrical Engineering, Stanford University, Stanford, CA 94305, USA.

Abstract

This paper investigates the performance of 1 mm resolution cadmium zinc telluride (CZT) detectors for positron emission tomography (PET) capable of positioning the 3D coordinates of individual 511 keV photon interactions. The detectors comprise 40 mm × 40 mm × 5 mm monolithic CZT crystals that employ a novel cross-strip readout with interspersed steering electrodes to obtain high spatial and energy resolution. The study found a single anode FWHM energy resolution of 3.06 ± 0.39% at 511 keV throughout most of the detector volume. Improved resolution is expected with properly shielded front-end electronics. Measurements made using a collimated beam established the efficacy of the steering electrodes in facilitating enhanced charge collection across anodes, as well as a spatial resolution of 0.44 ± 0.07 mm in the direction orthogonal to the electrode planes. Finally, measurements based on coincidence electronic collimation yielded a point spread function with 0.78 ± 0.10 mm FWHM, demonstrating 1 mm spatial resolution capability transverse to the anodes-as expected from the 1 mm anode pitch. These findings indicate that the CZT-based detector concept has excellent performance and shows great promise for a high-resolution PET system.

PMID:
21335649
PMCID:
PMC3274175
DOI:
10.1088/0031-9155/56/6/004
[Indexed for MEDLINE]
Free PMC Article

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