Abstract
Inter-crystal scatter causes mispositioning of scintillation events, which is of particular concern in imaging detectors based on small discrete scintillators. 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 this effect for evaluating and optimizing the design of a high resolution animal PET detector based on a small scintillator crystal array. In this simulation, we quantitatively assess the mispositioning of events due to inter-crystal scatter as a function of parameters such as different scintillator materials, crystal geometry, γ ray incident angle and energy threshold applied, etc. In analyzing the tradeoff between the detector efficiency and the position detection accuracy, we 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. We also evaluated different crystal positioning schemes to provide a theoretical estimation for the choice of the best scheme. To study how the inter-crystal scatter affects detector spatial resolution, we analyze the coincidence line spread function with and without the scatter, and found that the inter-crystal scatter has very little effect on the FWHM and FWTM of the coincidence line spread function.
| Original language | English (US) |
|---|---|
| Title of host publication | IEEE Nuclear Science Symposium & Medical Imaging Conference |
| Publisher | IEEE |
| Pages | 1006-1010 |
| Number of pages | 5 |
| Volume | 2 |
| State | Published - Dec 1 1995 |
| Event | Proceedings of the 1995 IEEE Nuclear Science Symposium and Medical Imaging Conference. Part 1 (of 3) - San Francisco, CA, USA Duration: Oct 21 1995 → Oct 28 1995 |
Other
| Other | Proceedings of the 1995 IEEE Nuclear Science Symposium and Medical Imaging Conference. Part 1 (of 3) |
|---|---|
| City | San Francisco, CA, USA |
| Period | 10/21/95 → 10/28/95 |
ASJC Scopus subject areas
- General Engineering