AI Article Synopsis
- An independent verification procedure was developed for measuring radiation doses in IMRT treatments for head and neck cancers, using TLDs (thermoluminescent dosimeters) inserted via a naso-oesophageal tube.
- The study involved 10 patients and included 177 TLD measurements, finding a close correlation between measured and calculated doses from the treatment planning system (1.002 +/- 0.051).
- The in vivo TLD measurements were effective, well-received by patients, and deemed suitable for accurate dose assessment in intensity-modulated radiation therapy.
Article Abstract
An independent in vivo dose verification procedure for IMRT treatments of head and neck cancers was developed. Results of 177 intracavitary TLD measurements from 10 patients are presented. The study includes data from 10 patients with cancer of the rhinopharynx or the thyroid treated with dynamic IMRT. Dose verification was performed by insertion of a flexible naso-oesophageal tube containing TLD rods and markers for EPID and simulator image detection. Part of the study focussed on investigating the accuracy of the TPS calculations in the presence of inhomogeneities. Phantom measurements and Monte Carlo simulations were performed for a number of geometries involving lateral electronic disequilibrium and steep density shifts. The in vivo TLD measurements correlated well with the predictions of the treatment planning system with a measured/calculated dose ratio of 1.002+/-0.051 (1 SD, N=177). The measurements were easily performed and well tolerated by the patients. We conclude that in vivo intracavitary dosimetry with TLD is suitable and accurate for dose determination in intensity-modulated beams.
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| http://dx.doi.org/10.1080/02841860500218983 | DOI Listing |
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