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Abstract #4153

Active-tracked versus Passive-tracked MRI-guided Cervical-cancer Brachytherapy catheter placement in 11 patients: Improved accuracy and reduced procedure time

Jose De Arcos1,2, Ehud J Schmidt1,3, Wei Wang1, Junichi Tokuda1, Kamal Vij4, Charles L Dumoulin5, Ravi T Seethmaraju6, Robert A Cormack7, and Akila N Viswanathan7,8

1Radiology, Brigham and Women's Hospital, Boston, MA, United States, 2Biomedical Engineering, King's College London, London, United Kingdom, 3Cardiology, Johns Hopkins University, Baltimore, MD, United States, 4MRI Interventions Inc., Irvine, CA, United States, 5Radiology, Cincinnati Children's Hospital Medical Center, Cincinnati, OH, United States, 6Siemens Healthcare Inc., Boston, MA, United States, 7Radiation Oncology, Brigham and Women's Hospital, Boston, MA, United States, 8Radiation Oncology, Johns Hopkins University, Baltimore, MD, United States

We performed MRI-guided placement of high dose rate (HDR) brachytherapy catheters in 11 cervical-cancer patients within a 3.0 T MRI scanner. We compared placing MR-tracked metallic stylets to passively-tracked conventional stylets. Comparisons were performed during three procedure stages: coarse stylet navigation to the approximate region of the tumor; fine-tuned navigation to the clinician’s desired (final) location; stylet pull-back (withdrawal) from the body, which provided catheter trajectories for Radiation Treatment Planning. Active-tracking’s main benefits; (I) catheters placed much closer to the clinician’s intended location, including via complex manipulations requiring complete withdrawal and repositioning, (II) placement durations similar to transrectal-ultrasound guided HDR procedures.

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