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Abstract #0575

Respiratory Motion Management in MR-guided Radiotherapy treatment and assessment with IVIM.

Benjamin Charles Lewis1, Robert Cadrain2, Christopher Chipko1, Armando Vera1, Emma Fields1, Siyong Kim1, and Taeho Kim1,3

1Radiation Oncology, Virginia Commonwealth University, Richmond, VA, United States, 2C. Kenneth and Dianne Wright Center for Clinical and Translational Research, Virginia Commonwealth University, Richmond, VA, United States, 3Radiation Oncology, Washington University in St. Louis, St. Louis, MO, United States

In radiotherapy (RT), respiratory motion induced target displacement can cause the treatment beam to miss the target, irradiating normal tissue instead. This study introduces a novel pressure based motion management system with biofeedback, compatible with MRI, CT, and megavoltage RT. A belt, wrapped around the abdomen, with a pressure sensor provided respiratory traces and guidance to subjects during MR acquisition. Superior-inferior liver dome motion could be reduced from 30.6mm under free breathing to 5.6mm with a small guiding window. This device provides significant motion reduction and a surrogate to internal organ motion for use across the RT treatment process.

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