Cartesian spirals: An alternative to radial imaging for 4D-MRI in MR-guided radiotherapy
Motivation: 4D-MRI could improve online MR-guided radiotherapy treatments on the MR-Linac, but long reconstruction times hinder clinical implementation. Goal(s): To reconstruct and evaluate respiratory-correlated and time-resolved 4D-MRIs from different acquisitions. Approach: We reconstructed 4D-MRIs using the XD-GRASP and GRASP-Pro algorithms from a clinical protocol (stack-of-stars) and a new Cartesian spiral sequence. We compared the reconstructions regarding diaphragm motion. Results: Respiratory-resolved 4D-MRIs were reconstructed under 4 minutes from current acquisitions. Time-resolved 4D-MRIs from clinical acquisitions showed significant artefacts limiting the achievable temporal resolution which can be overcome by using a different acquisition. Impact: Respiratory-correlated 4D-MRIs reconstruction times were compatible with online radiotherapy constraints for pancreatic cancer patients on the MR-Linac. Reaching high temporal resolutions in reconstructing time-resolved 4D-MRIs is not currently possible from the current clinical protocol.
Authors
- Andreas Wetscherek (ORCID: https://orcid.org/0000-0003-4799-2193)
- Rosalyne Westley (ORCID: https://orcid.org/0000-0001-5242-8736)
- Wayne Luk (ORCID: https://orcid.org/0000-0002-6750-927X)
- Uwe Oelfke
- Bastien Lecoeur (ORCID: https://orcid.org/0000-0002-0516-0551)
- Feng Li (ORCID: https://orcid.org/0000-0002-0763-014X)
- Prashant Nair (ORCID: https://orcid.org/0000-0002-9339-7996)
Publication Details
- Journal
- Proceedings on CD-ROM - International Society for Magnetic Resonance in Medicine. Scientific Meeting and Exhibition/Proceedings of the International Society for Magnetic Resonance in Medicine, Scientific Meeting and Exhibition
- Published
- 2024-11-26
- DOI
- https://doi.org/10.58530/2024/1872
- Citations
- 1
- Primary Topic
- Advanced Radiotherapy Techniques
- Type
- article
- Field-Weighted Citation Impact
- 0.61