Experimental verification of Advanced Collapsed‐cone Engine for use with a multichannel vaginal cylinder applicator
| Autor: | Ron S. Sloboda, Brie Cawston-Grant, Hali Morrison, Geetha Menon |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
medicine.medical_specialty
Materials science Vaginal Neoplasms Dose calculation Collapsed cone medicine.medical_treatment Brachytherapy phantoms 030218 nuclear medicine & medical imaging 03 medical and health sciences 0302 clinical medicine medicine Radiation Oncology Physics Humans Radiology Nuclear Medicine and imaging Radiochromic film Medical physics Instrumentation 87.55.d ACE Radiation Phantoms Imaging Radiotherapy Planning Computer-Assisted gynecology Radiotherapy Dosage Vaginal Cylinder 87.55.kd Formalism (philosophy of mathematics) radiochromic film 87.53.Bw 030220 oncology & carcinogenesis Female 87.53.Bn Algorithms Biomedical engineering |
| Zdroj: | Journal of Applied Clinical Medical Physics |
| ISSN: | 1526-9914 |
| Popis: | Model‐based dose calculation algorithms have recently been incorporated into brachytherapy treatment planning systems, and their introduction requires critical evaluation before clinical implementation. Here, we present an experimental evaluation of Oncentra® Brachy Advanced Collapsed‐cone Engine (ACE) for a multichannel vaginal cylinder (MCVC) applicator using radiochromic film. A uniform dose of 500 cGy was specified to the surface of the MCVC using the TG‐43 dose formalism under two conditions: (a) with only the central channel loaded or (b) only the peripheral channels loaded. Film measurements were made at the applicator surface and compared to the doses calculated using TG‐43, standard accuracy ACE (sACE), and high accuracy ACE (hACE). When the central channel of the applicator was used, the film measurements showed a dose increase of (11 ± 8)% (k = 2) above the two outer grooves on the applicator surface. This increase in dose was confirmed with the hACE calculations, but was not confirmed with the sACE calculations at the applicator surface. When the peripheral channels were used, a periodic azimuthal variation in measured dose was observed around the applicator. The sACE and hACE calculations confirmed this variation and agreed within 1% of each other at the applicator surface. Additionally for the film measurements with the central channel used, a baseline dose variation of (10 ± 4)% (k = 2) of the mean dose was observed azimuthally around the applicator surface, which can be explained by offset source positioning in the central channel. |
| Databáze: | OpenAIRE |
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