Abstract #1866

Single-Shot, Navigator-Based Approach to Retrospective 4D MRI: balanced-SSFP vs. Single-Shot Fast Spin Echo

Daniel V Litwiller¹, Erik Tryggestad², Kiaran McGee³, Yuji Iwadate⁴, Lloyd Estkowski⁵, and Ersin Bayram⁶

¹Global MR Applications & Workflow, GE Healthcare, New York, NY, United States, ²Department of Radiation Oncology, Mayo Clinic, Rochester, MN, United States, ³Department of Radiology, Mayo Clinic, Rochester, MN, United States, ⁴Global MR Applications & Workflow, GE Healthcare, Hino, Tokyo, Japan, ⁵Global MR Applications & Workflow, GE Healthcare, Menlo Park, CA, United States, ⁶Global MR Applications & Workflow, GE Healthcare, Houston, TX, United States

One of the motivations for 4D MRI is the need to characterize patient respiratory motion in the context of radiation therapy treatment planning (RTP). Here, we compare two approaches for generating 4D MRI data using dynamic, navigator-based acquisitions with retrospective respiratory compensation, including single-shot balanced-SSFP and single-shot fast spin echo with variable refocusing flip angle (vrfSSFSE). The results presented suggest that both sequences offer a straightforward approach to generating 4D MRI data for MR-guided RTP.

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