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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