Integrated MR-guided radiotherapy systems make it possible to monitor intra-fraction anatomy changes due to motion. A Simultaneous Multi-Slice (SMS) balanced SSFP sequence with interleaved stacks is used for dynamic imaging, where SMS is used to increase the spatial coverage without decreasing the frame rate. It is shown that SMS factors up to 4 are feasible without significant artifacts, for both orthogonal and parallel stacks.
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