SU-E-T-307: Quantitative Assessment of the Source Attenuation for the New CT-Compatible Titanium Fletcher-Suit-Delclos (FSD) Gynecologic Applicator

Medical Physics
N SoniE Ishmael Parsai

Abstract

To quantify the effect of 192Ir source attenuation due to titanium material used in manufacturing the new CT-compatible FSD device during treatment delivery. A typical cervical cancer treatment includes primary external beam followed by a course of HDR Intra-Cavitary brachytherapy using FSD applicator. A detailed geometry of the applicator obtained from the manufacturer is implemented using Monte Carlo (MC) simulation package MCNP5. The bending angles of tandem and colpostats are 150 and 1200 respectively. The source geometry is of the VariSource wire model VS2000. We assigned 8 dwell positions in the tandem and 4 dwell positions in each colpostat to calculate dose rate at reference points with and without titanium wall present in the simulation. Based on the MC computation, the titanium tube reduced the overall dose to point A by ∼1.5%, with contributions varying for each dwell position. We also compare MC results with BrachyVision treatment planning system calculations. The clinically used algorithm is based on AAPM report TG-43, which calculates the dose without inhomogeneity correction. The latest Varian release of the planning software BrachyVision-Acuros has the updated algorithm capable of inhomogeneity corrected dose ca...Continue Reading

Citations

Apr 30, 2020·Stress and Health : Journal of the International Society for the Investigation of Stress·Elisabeth PresteleTanja Lischetzke
May 12, 2016·Australasian Physical & Engineering Sciences in Medicine·Mahdi GhorbaniAli S Meigooni

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