Abstract # 2550 4D CT for Hepatobiliary Malignancies: Organs at Risk and Implications for Gating

Presenter: Ma, Daniel

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Respiratory motion consistently irradiated more of the liver during tidal inspiration. The left kidney dose was minimally changed over the respiratory cycle. No class generalization could characterize the influence of breathing on the right kidney dose, with significant changes in the Right KidneyV18 between tidal inspiration and expiration. Individualized patient protocols using gating treatment during inspiration or expiration could potentially reduce dose to liver and kidneys, allowing dose escalation or increased chemotherapy during radiation. Change in Right Kidney Dose with Inspiration

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