Abstract #4802

Cartesian Spiral acquisitions for radiotherapy on an MR-Linac

Bastien Lecoeur^1,2, Prashant Nair¹, Rosie Goodburn¹, Tom Bruijnen³, Uwe Oelfke¹, Wayne Luk², and Andreas Wetscherek¹

¹Joint Department of Physics, The Institue of Cancer Research, Sutton, United Kingdom, ²Department of Computing, Imperial College London, London, United Kingdom, ³Department of Radiotherapy, University Medical Center Utrecht, Utrecht, Netherlands

Synopsis

Keywords: Image Reconstruction, Radiotherapy

Respiratory-resolved 4D-MRIs could measure the extent of respiratory motion for online MR-guided radiotherapy on MR-Linacs. Cartesian spiral (CASPR) trajectories are an alternative to radial sampling for self-gated 4D-MRIs, because they could avoid prohibitively long image reconstruction times related to the non-uniform Fourier Transform. We studied the effect of different sampling parameters on image quality for CASPR-based sequences on an MR-Linac and reconstructed abdominal 4D-MRI, we found that increasing the number of points per spiral arm improved the reconstructed image quality, creating a trade-off between spatial and temporal resolutions.

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