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New approach to obtain high resolution using conventional block designs in PET

By: Andreaco, M.; Zhang, N.; Grazioso, R.; Doshi, N.; Bean, K.; Eriksson, L.; Aykac, M.; Schmand, M.; Loope, M.; Corbeil, J.; Williams, C.;

2004 / IEEE / 0-7803-8700-7

Description

This item was taken from the IEEE Conference ' New approach to obtain high resolution using conventional block designs in PET ' High spatial resolution is essential to image small lesions in positron emission tomography (PET). Traditional methods suggest using small crystals to obtain high resolution. In this study, a novel method is introduced to achieve high spatial resolution by using scintillators with different decay times arranged in a checkerboard pattern. Pulse shape discrimination (PSD) was implemented to determine which crystal the gamma energy is deposited. In this work, 13/spl times/13 LSO and 13/spl times/13 LSO-GSO crystal arrays using 4/spl times/4/spl times/20 mm/sup 3/ crystals were built and optimized using light sharing techniques. The average pixel resolution for the 13/spl times/13 LSO was measured to be 14.5%. Similarly, the average pixel resolutions for the GSO part of the 13/spl times/13 LSO-GSO crystal array and the LSO part of the same array were measured to be 13.9% and 18.5%, respectively. Due to the difference in the probability of forward scattering between GSO and LSO, the average energy resolution for LSO degraded from 14.5% to 18.5%. The average peak-to-valley ratios were measured to be 2.1 for the 13/spl times/13 LSO crystal array, 7.2 for the LSO part of the 13/spl times/13 LSO-GSO crystal array and 4.3 for the GSO part of the 13/spl times/13 LSO-GSO crystal array.