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 Arcos^1,2, Ehud J Schmidt^1,3, Wei Wang¹, Junichi Tokuda¹, Kamal Vij⁴, Charles L Dumoulin⁵, Ravi T Seethmaraju⁶, Robert A Cormack⁷, and Akila N Viswanathan^7,8

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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