Poster - Thur Eve - 67: Clinical results of deep inspiration breath hold radiation treatment for the left breast patients

Medical Physics
R JiangE Osei

Abstract

Adjuvant radiotherapy for left breast cancers increases local tumor control, but also increases the risk of radiation-induced cardiac disease. Deep Inspiration Breath Hold (DIBH) can minimize dose to the heart for left breast patients where the heart is within the tangential field. In this study, we evaluated the dosimetric benefit of DIBH technique comparing to free breathing (FB) radiotherapy for left breast cancer patients. Five patients with left breast cancer treated with DIBH technique were selected randomly. The CT scans of breath hold (BH) and FB were taken for every DIBH patient. Standard clinical DIBH intensity-modulated radiotherapy (IMRT) plans were generated with BH scan dataset using the Varian Eclipse TP system. The prescription dose is 4250 cGy in 16 fractions. The BH plan was copied to the FB scan dataset and shifted accordingly to have the same coverage for the breast tissue, and the dose was re-calculated. Dose-volume histograms (DVH) of the heart and lung; mean dose and maximum dose of the heart were calculated and compared from the BH and FB plans for every patient. The lung volume is increased during BH and hence the heart is moved out of the field, resulting in the lower heart maximum dose. The mean dose ...Continue Reading

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