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Abstract #0297

Multiple-echo steady-state for MR-only prostate radiotherapy: Combined T1/T2-weighted imaging, water-fat separation, and synthetic CT

Frank Zijlstra1, Mateusz C Florkow1, and Peter R Seevinck1,2
1Image Sciences Institute, UMC Utrecht, Utrecht, Netherlands, 2MRIguidance BV, Utrecht, Netherlands

We propose an efficient sequence for the acquisition of multiple contrasts for MR-only radiotherapy. By including T2-weighted echoes to a gradient echo sequence, this sequence provides T1- and T2-weighted imaging and water-fat separation in a single 4 minute acquisition. A previously trained deep neural network for synthetic CT generation was successfully applied to this new sequence, demonstrating that synthetic CT-based dose calculations can be performed. Furthermore, increased contrast between the anatomies of interest shows promise for (automatic) segmentation.

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