A Monte Carlo simulation system was enhanced in order to analyze photon transport in tapered geometries. This system was used to evaluate the performance of new tapered collimator designs, for multi-slice positron emission tomography (MS-PET) and positron volumetric imaging systems (PVI-Systems). For each imaging modality, the performance of the new collimators was compared to those of the current collimators of choice. Collimators were evaluated based upon their: (1) trues detection efficiencies; (2) scatter detection efficiencies; (3) scatter fractions; and (4) total singles to trues events ratios. In MS-PET, collimators with a diamond-like cross section--double tapered collimators--were introduced and their performance compared to those of single tapered and cylindrical collimators. Double tapered collimators yielded better performance than single tapered ones. In PVI systems, external tapered collimators were simulated and their performance compared to those of cylindrical ones. External tapered collimators did not improve the scanner performance.
| Identifer | oai:union.ndltd.org:LACETR/oai:collectionscanada.gc.ca:QMM.60652 |
| Date | January 1992 |
| Creators | Moreno-Cantú, Jorge J. |
| Publisher | McGill University |
| Source Sets | Library and Archives Canada ETDs Repository / Centre d'archives des thèses électroniques de Bibliothèque et Archives Canada |
| Language | English |
| Detected Language | English |
| Type | Electronic Thesis or Dissertation |
| Format | application/pdf |
| Coverage | Master of Science (Department of Medical Radiation Physics.) |
| Rights | All items in eScholarship@McGill are protected by copyright with all rights reserved unless otherwise indicated. |
| Relation | alephsysno: 001277596, proquestno: AAIMM74487, Theses scanned by UMI/ProQuest. |
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