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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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