Evaluation of variation in dose of organs at risk in intracavitary brachytherapy of cervical cancer – a prospective study
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Authors
Sharma, Brahmacharimayum Arunkumar
Singh, Th. Tomcha
Singh, L. Jaichand
Issue Date
2011-03-31
Type
Article
Language
en_US
Keywords
HDR Brachytherapy , Cervical Cancer , ICRU , Rectum , Bladder
Alternative Title
Abstract
Purpose:
The aim of this work was to evaluate the variation of dose in organs at risk (OARs) in fractionated high dose rate intracavitary brachytherapy (HDR-BT) for cervical cancer.
Material and methods:
A prospective study was carried out on 20 cervical cancer patients treated with fractionated (HDR-BT). International Commission on Radiation Units and Measurement (ICRU) bladder (bICRU) and rectum (rICRU) points were defined according to ICRU Report 38, using two orthogonal radiograph images taken by Simulator (Simulix HQ®) and prospectively kept to less than 80% of prescription dose to point A during real treatment planning process using the Plato Sunrise Treatment Planning System®.
Results:
The average variation of individuals in estimated doses of OARs in the inter fractional as well as in a single fraction were 2.4% and 0.7% of point A for rICRU, 4.3% and 1.6% for bICRU, and 0.8% & 0.2% for point B, whereas point A itself was found to be 1.6% & 0.6%.
Conclusions:
Average variation of the delivery of dose per fraction was found well within the recommended limit. The study observed smaller variation of doses to OARs which could present better reproducibility of geometry of (HDR-BT) applicators and its relative displacement with critical structures. Transportation of patient from simulator room to treatment room causes small uncertainties in delivery dose.
Description
Citation
Sharma, B. A., Singh, T. T., & Singh, L. J. (2011). Evaluation of variation in dose of organs at risk in intracavitary brachytherapy of cervical cancer - a prospective study. Journal of contemporary brachytherapy, 3(1), 23–25. https://doi.org/10.5114/jcb.2011.21039
Publisher
Journal of Contemporary Brachytherapy