Effect of superposition assumption on Monte Carlo dose calculation about shielded gynecological colpostats

J. Markman, J. F. Williamson, D. A. Low, J. F. Dempsey

Research output: Contribution to journalConference articlepeer-review

1 Scopus citations

Abstract

The Fletcher-Suit-Delclos (FSD) intracavitary vaginal applicator typically incorporates tungsten shielding to reduce dose to the bladder and rectum. Dose distributions about a single colpostat have been extensively measured and calculated. However, these measurements do not consider perturbations from the contralateral colpostat or the intrauterine tandem on the dose distribution. Accurate accounting for all dosimetric effects in brachytherapy is essential for both dose based implant optimization and for comparison with alternate modalities, such as intensity modulated radiation therapy. We have used Monte Carlo calculations to evaluate the accuracy of the superposition principle as it applies to both single shielded applicator dose distributions and single source dose distributions. Preliminary analysis indicates differences ranging from 2-5%, warranting further investigation.

Original languageEnglish
Pages (from-to)387-390
Number of pages4
JournalAnnual International Conference of the IEEE Engineering in Medicine and Biology - Proceedings
Volume1
StatePublished - Dec 1 2000
Event22nd Annual International Conference of the IEEE Engineering in Medicine and Biology Society - Chicago, IL, United States
Duration: Jul 23 2000Jul 28 2000

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