Dosimetry of interstitial brachytherapy using radiophotoluminescence glass: On absorbed dose of anterior wall of the rectum]

It has been almost impossible to perform in-vivo dosimetry of interstitial brachytherapy because of the lack of appropriate dosimeters. The newly developed photoluminescence dosimeter "Dose Ace" is suitable for interstitial brachytherapy dosimetry in terms of its small size, ease of handling, and good reproducibility. We performed dosimetry of the anterior rectal wall by suturing a Teflon tube containing photoluminescence dosimeters. We measured doses at 50 points in seven pelvic malignancy patients and calculated the dose at each point by planning computer. The mean ratio of measured dose to calculated dose was 1.108 to 0.213. The absorbed dose of the anterior rectal wall can be presumed from the calculated dose with about 10% deviation.