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Abstract #5549

Using multi-stack simultaneous multi-slice bSSFP for improved motion characterization during MR-guided radiotherapy

Pim Borman1, Clemens Bos2, Sjoerd Crijns1, Chrit Moonen2, Bas Raaymakers1, and Rob H.N. Tijssen1

1Radiotherapy, UMC Utrecht, Utrecht, Netherlands, 2Imaging Division, UMC Utrecht, Utrecht, Netherlands

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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