A study of inter-crystal scatter in small scintillator arrays designed for high resolution PET imaging
- UCLA School of Medicine, Los Angeles, CA (United States)
Inter-crystal scatter causes mispositioning of scintillation events, which is of particular concern in imaging detectors based on small discrete scintillator elements. Because it is difficult to measure the scatter and its effects on detector intrinsic spatial resolution, a Monte Carlo simulation has been used to study inter-crystal scatter effects for evaluating and optimizing the design of a high resolution PET detector based on an array of small scintillator crystals. In this simulation, the authors quantitatively assess the mispositioning of events due to inter-crystal scatter as a function of parameters such as different scintillator materials, crystal geometry, {gamma} ray incident angle and applied energy threshold. In analyzing the tradeoff between the detector efficiency and the position detection accuracy, they found that the mispositioning is not sensitive to the energy threshold, however it does change rapidly with the crystal length and the gap between crystals. They also compared four different crystal positioning algorithms to provide a theoretical estimate of positioning accuracy and to determine the best algorithm to use. To study how intercrystal scatter affects detector spatial resolution, they analyzed the coincidence line spread function with and without intercrystal scatter and found that the inter-crystal scatter had very little effect on the FWHM and FWTM of the coincidence line spread function.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 276523
- Report Number(s):
- CONF-951073--
- Journal Information:
- IEEE Transactions on Nuclear Science, Journal Name: IEEE Transactions on Nuclear Science Journal Issue: 3Pt2 Vol. 43; ISSN IETNAE; ISSN 0018-9499
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
INCLUDING NUCLEAR AND PARTICLE DETECTORS
55 BIOLOGY AND MEDICINE
BASIC STUDIES
COMPARATIVE EVALUATIONS
COMPTON EFFECT
COMPUTERIZED SIMULATION
DESIGN
GAMMA RADIATION
OPTIMIZATION
PERFORMANCE
POSITION SENSITIVE DETECTORS
POSITRON COMPUTED TOMOGRAPHY
SCATTERING
SOLID SCINTILLATION DETECTORS
SPATIAL RESOLUTION