Abstract #4157

Free-breathing 3D T2-weighted TSE using Cartesian acquisition with rewinded spiral profile ordering (rCASPR) for abdominal radiotherapy

Tom Bruijnen^1,2, Osman Akdag^1,2,3, Charlotte VM Bruel^1,2,3, Bjorn Stemkens^1,2, Tim Schakel¹, Jan JW Lagendijk¹, Cornelis AT van den Berg^1,2, and Rob HN Tijssen¹

¹Department of Radiotherapy, University Medical Center Utrecht, Utrecht, Netherlands, ²Computational Imaging Group for MRI diagnostics and therapy, Centre for Image Sciences, University Medical Center Utrecht, Utrecht, Netherlands, ³Department of Biomedical Engineering, Eindhoven University of Technology, Eindhoven, Netherlands

T₂-weighted turbo spin-echo (TSE) sequences are used for abdominal tumour contouring in MR-guided radiotherapy, but these sequences are generally not compatible with most respiratory-correlated 4D imaging methods. To overcome this limitation we propose a free-breathing T₂-weighted TSE sequence based on a Cartesian acquisition with rewinded spiral profile ordering in combination with motion compensated image reconstruction. We showed that high quality free-breathing T₂-weighted TSE scans are feasible with short scan times (<5 min), which have similar contrast to the conventional linear sampled scans while simultaneously quantifying the respiratory motion.

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