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Abstract #2197

MRI Provides More Accurate Renal Motion Estimation than 4D-CT for Radiation Treatment Planning in Young Children

Adam M Winchell 1,2 , Atmaram Pai Panandiker 1 , Ruitian Song 1 , Ralf B Loeffler 1 , and Claudia M Hillenbrand 1

1 Radiological Sciences, St. Jude Childrens Research Hospital, Memphis, TN, United States, 2 Biomedical Engineering, University of Memphis, Memphis, TN, United States

In this study, we measured respiratory induced kidney motion in young children with abdominal neuroblastoma using both 4D-CT and real-time MRI to evaluate tracking accuracy. Real-time MRI provides a more desirable tissue contrast of the kidney and had about two times higher spatial resolution in the superior/inferior direction compared to 4D-CT which enabled superior demarcation of organ boundaries, anatomical tracking, and improved accuracy.

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