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 ti...

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Bibliographic Details
Main Authors: Aykac, M., Grazioso, R., Bean, K., Doshi, N., Zhang, N., Andreaco, M., Eriksson, L., Williams, C., Corbeil, J., Loope, M., Schmand, M.
Format: Conference Proceeding
Language:English
Subjects:
Crystals
Degradation
Energy resolution
Lesions
Light scattering
Optical arrays
Positron emission tomography
Pulse shaping methods
Shape
Spatial resolution
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Summary: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.
ISSN:1082-3654
2577-0829
DOI:10.1109/NSSMIC.2004.1462727