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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