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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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