Abstract #4031

Comparison of SENSE-accelerated PROPELLER and Single-shot Turbo Spin-Echo Sequences for Visualization of the Prostatic Urethra during MRI-based Radiotherapy Treatment Planning

Kristen Zakian¹, Andreas Wibmer², Hebert Vargas Alvarez², Eveline Alberts³, Mo Kadbi³, Borys Mychalczak⁴, Marisa Kollmeier⁴, Daniel Gorovets⁴, Sean McBride⁴, Margie Hunt¹, Michael Zelefsky⁴, and Neelam Tyagi¹

¹Medical Physics, Memorial Sloan Kettering Cancer Center, New York, NY, United States, ²Radiology, Memorial Sloan Kettering Cancer Center, New York, NY, United States, ³Philips Medical Systems, Best, Netherlands, ⁴Radiation Oncology, Memorial Sloan Kettering Cancer Center, New York, NY, United States

At our institution, a Foley catheter is inserted during prostate SBRT simulation to ensure visualization of the prostatic urethra. Our goal was to find an optimal motion-robust T2-weighted pulse sequence that would allow for accurate catheter-free visualization and segmentation of the urethra. We compared Multivane XD (MVXD), a PROPELLER-based multislice TSE sequence with SENSE acceleration to single-shot TSE with SENSE (SSTSE). Two expert GU radiologists scored urethra visibility in MVXD and SSTSE series of equivalent spatial resolution and duration. Urethra visibility scores were significantly higher in the MVXD series and SNR was found to be superior in all MVXD series.

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