Abstract #3839

Motion tracking using simultaneous MR and 4D ultrasound acquisition for image guided radiation therapy

Thomas KF Foo¹, Bo Wang¹, Jhimli Mitra¹, David Mills¹, L Scott Smith¹, Heather Chan¹, Aqsa Patel¹, Shourya Sarcar¹, Eric Fiveland¹, Warren Lee¹, Sydney Jupitz², Alan McMillan³, James H Holmes³, Wes Culberson², Michael Bassetti⁴, Andrew Shepard², and Bryan Bednarz²

¹GE Global Research, Niskayuna, NY, United States, ²Medical Physics, University of Wisconsin, Madison, WI, United States, ³Radiology, University of Wisconsin, Madison, WI, United States, ⁴Human Oncology, University of Wisconsin, Madison, WI, United States

An MR-compatible 4D ultrasound probe allows hands-free, simultaneous MR and ultrasound image acquisition. This new imaging capability provides a path for tracking tumor target motion during radiation therapy, as an alternative to an integrated MR-LINAC system. To facilitate this, the ability to track the motion of fiducial markers as an indication of respiratory state is essential. In our approach, as the MR images are acquired outside of the radiation therapy procedure, motion tracking of endogenous ultrasound fiducials is proposed to determine respiratory states.

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