Experimental verification of Advanced Collapsed-cone Engine for use with a multichannel vaginal cylinder applicator.

Experimental verification of Advanced Collapsed-cone Engine for use with a multichannel vaginal cylinder applicator.
J Appl Clin Med Phys. 2017 Mar 20;:
Authors: Cawston-Grant B, Morrison H, Menon G, Sloboda RS
Abstract
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 confirme...

Source: Journal of Applied Clinical Medical Physics - March 19, 2017 Category: Physics Authors: Cawston-Grant B, Morrison H, Menon G, Sloboda RS Tags: J Appl Clin Med Phys Source Type: research