A new model is proposed for the calculation of relative depth doses for diagnostic radiology using a direct photon transport/ray tracing technique which incorporates both primary and first scatter dose. The x-ray spectra are generated from computer algorithms based on the Birch and Marshall semi-empirical model; the spectra are established by matching calculated and measured transmission data. The algorithms for the generation of x-ray spectra and for the calculation of depth doses are described. Relative depth doses are determined for a number of radiographic techniques. The calculations are compared with measured and published depth doses; the agreement is very good for tube voltages below 90 kV$ sb{ rm p}$. It is suggested that relative integral doses obtained from relative depth doses give an accurate representation of risk reductions obtained with different radiological techniques. The integral dose reductions predicted by the model are within 8.5% of those from measured data.
| Identifer | oai:union.ndltd.org:LACETR/oai:collectionscanada.gc.ca:QMM.60566 |
| Date | January 1991 |
| Creators | Bissonnette, Jean-Pierre |
| 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: 001243385, proquestno: AAIMM72156, Theses scanned by UMI/ProQuest. |
Page generated in 0.0018 seconds