Abstract #0636

Evaluation of 3D Radial Phyllotaxis Trajectories for Artifact-Free Imaging and Parametric Mapping

Eva S Peper^1,2, Grzegorz Bauman^3,4, Berk C Açikgöz^1,2,5, Nils MJ Plähn^1,2,5, Adèle LC Mackowiak⁶, Yasaman Safarkhanlo^2,5,7, Davide Piccini⁸, Li Feng⁹, Christopher Roy⁶, Oliver Bieri^3,4, and Jessica AM Bastiaansen^1,2

¹Department of Diagnostic, Interventional and Pediatric Radiology (DIPR), Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland, ²Translational Imaging Center (TIC), Swiss Institute for Translational and Entrepreneurial Medicine, Bern, Switzerland, ³Division of Radiological Physics, Department of Radiology, University Hospital Basel, Basel, Switzerland, ⁴Department of Biomedical Engineering, University of Basel, Allschwil, Switzerland, ⁵Graduate School for Cellular and Biomedical Sciences, University of Bern, Bern, Switzerland, ⁶Department of Radiology, Lausanne University Hospital and University of Lausanne, Lausanne, Switzerland, ⁷Department of Cardiology, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland, ⁸Scientific Collaborations and Strategic Partnerships, Siemens Healthcare Srl, Milano, Italy, ⁹Center for Advanced Imaging Innovation and Research (CAI2R), Department of Radiology, New York University Grossman School of Medicine, New York, NY, United States

Synopsis

Keywords: New Trajectories & Spatial Encoding Methods, System Imperfections: Measurement & Correction, Radial MRI, bSSFP

Motivation: Using the original 3D radial spiral phyllotaxis trajectory leads to image artifacts and parametric mapping inaccuracies.

Goal(s): To develop two alternative 3D radial phyllotaxis trajectories enabling artifact-free images and accurate parametric mapping.

Approach: Evaluate two trajectories that (1) sample opposite radial spokes and (2) avoid jumps in k-space. Compare image quality and parametric maps obtained using the new trajectories in a phase-cycled bSSFP sequence with the original phyllotaxis and a Cartesian trajectory.

Results: The two alternative 3D radial trajectories mitigate artifacts and significantly reduce errors in T1,T2 estimation in phantoms and in the brain of three healthy volunteers, compared with the original implementation.

Impact: The proposed 3D radial phyllotaxis trajectory designs reduce artifacts and improve T1,T2 mapping accuracy, enhancing image quality for researchers using 3D radial imaging across MRI sequences, including bSSFP. These designs enable accurate radial imaging in both research and clinical applications.

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