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Abstract #0678

Real-time active-tracking of metallic needles during MR-guided radiation therapy: from concept to the first human trial

Wei Wang 1,2 , Zion T. H. Tse 3 , Wolfgang Loew 4 , Charles L. Dumoulin 4 , Isaiah Norton 5 , Ravi T. Seethamraju 6 , Antonio L. Damato 2 , Tina Kapur 1 , Akila N. Viswanathan 2 , Robert A. Cormack 2 , and Ehud J. Schmidt 1

1 Radiology, Brigham & Womens Hospital, Harvard Medical School, Boston, MA, United States, 2 Radiation Oncology, Brigham & Womens Hospital, Harvard Medical School, Boston, MA, United States, 3 Engineering, University of Georgia, GA, United States, 4 Radiology, Cincinnati Children's Hospital, OH, United States, 5 Neurosurgery, Brigham & Womens Hospital, Harvard Medical School, Boston, MA, United States, 6 Siemens Healthcare, MA, United States

MRI is increasingly used for radiation treatment, due to improved visualization of the tumor and its surroundings. An active tracking application was developed enableing rapid and accurate real-time tracking of a metallic brachytherapy needle. The active-tracking device was built by adding printed-circuit microcoils to the needle. Because of its far-reaching lobe pattern, the coils can detect RF beyond the region where metal creates magnetic field disturbance. A tracking sequence with phase-field dithering removed B 1 interference from neighboring metallic coils. The tracking system was tested in phantom and successfully applied to track needle placement in a endometrial cancer intervention.

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