Poster - Thur Eve - 33: A comprehensive analysis of the effect of respiratory motion on the delivery of IMRT to advanced stage non-small cell lung cancer

Medical Physics
G HopkinsStewart Gaede

Abstract

The goal of this work was to quantify the interplay effect of various IMRT delivery techniques in the treatment of Stage III non-small cell lung cancer. Five patients with significant tumour motion were retrospectively planned on the average 4D-CT dataset with eight different IMRT techniques: three Tomotherapy techniques with different beam-widths, two step-and-shoot (SS-IMRT) with different complexity, one sliding-window (SW-IMRT), and two VMAT techniques (RapidArc and SmartArc). Each plan was calculated on a delivery verification phantom that was mounted on a programmable respiratory motion platform and delivered under the following motion conditions: 1) Static; 2) sinusoidal with 4 different amplitudes; 3) Real Patient Breathing. A standard 3%/3mm gamma analysis compared the sum of all 30 fractions to their corresponding 60Gy/30fx plan. One-way ANOVA was conducted for respiratory motion amplitude and IMRT modality, separately. There were no significant differences amongst the modalities at any amplitude level. However, for individual modalities, there were significant differences amongst different amplitudes except for Tomo-2.5cm (p=0.260). Post-hoc Tukey tests determined that detectable significant differences amongst any m...Continue Reading

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