SU-FF-T-66: Dwell Position Inaccuracy in the Varian GammaMed HDR Ring Applicator
نویسندگان
چکیده
منابع مشابه
Dwell position inaccuracy in the Varian GammaMed HDR ring applicator
Varian has issued two Product Notification Letters warning of known inaccuracies in dwell positions for their GammaMed HDR ring applicator. This inaccuracy was measured for two sets of applicators. Autoexposed radiographs were taken of the HDR source at different dwell positions and analyzed per Varian recommendations using tools within the BrachyVision treatment planning program. Comparison be...
متن کاملSU-E-T-138: Quantification of Dwell Position Inaccuracy in Varian GammaMed HDR Titanium Ring Applicators.
PURPOSE To quantify the dwell position inaccuracy in Titanium ring applicators and develop a test to be performed quarterly, after source exchange. METHODS All three rings from our Titanium kit (30, 45, 60 deg.) were used for this study. EDR2 film was placed on the Simulator table and a ring was taped to the film, with a solid water slab as buildup. A 1-cm spacing dummy wire was inserted into...
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As part of quality assurance (QA) in high dose rate brachytherapy, it is necessary to verify that the source dwell positions correspond to the radiographic markers used in simulation and treatment planning. The procedure is well established for linear tandem applicators. However, with the advent of ring applicators, this has become more critical and challenging. This work describes a new approa...
متن کاملCommissioning of Varian ring & tandem HDR applicators: reproducibility and interobserver variability of dwell position offsets
Studies have shown that source dwells within Varian's HDR CT/MR compatible ring applicators can deviate from intended positions by several millimeters. Quantifying this offset is an important part of commissioning. The aims of this study were to: 1) determine the reproducibility of the offset, 2) study the interobserver variation in the offset's measurement, and 3) quantify the dosimetric impac...
متن کاملComparison of single and multiple dwell position methods in MammoSite high dose rate (HDR) brachytherapy planning
The purpose of this study is to dosimetrically compare two plans generated using single dwell position method (SDPM) and multiple dwell position methods (MDPM) in MammoSite high dose rate (HDR) brachytherapy planning for 19 breast cancer patients. In computed tomography (CT) image-based HDR planning, a surface optimization technique was used in both methods. Following dosimetric parameters were...
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ژورنال
عنوان ژورنال: Medical Physics
سال: 2009
ISSN: 0094-2405
DOI: 10.1118/1.3181539