Authors
Leidi, M., Delitroz, J., Peper, E., Jia, Y., Barranco, J., Ledoux, J.-B., Romanin, L., Bastiaansen, J. A. M., Schneider, J., Franceschiello, B.
Abstract
Purpose: To develop 3D radial spiral phyllotaxis trajectories that provide a uniform density distribution of readout directions and support retrospec- tive sequential binning, thereby reducing ringing artifacts and improving image quality. Methods: UPhy trajectory redefines the polar angle to achieve uni- form density distribution of readout directions. FlexiPhy further decouples the azimuthal and polar ordering of interleaves through a randomized permutation, improving robustness to sequential binning. The proposed trajectories were evaluated in vivo on 10 healthy volunteers using two gradient-echo sequences on a 3T MRI scanner. Sequential temporal recon- structions were compared with reference reconstructions using structural similarity and relative L2 error metrics. Results: UPhy presents analytically demonstrated uniform density dis- tribution of readout directions. Quantitative analysis shows significantly higher SSIM values and lower relative L2 errors for FlexiPhy compared with both the original phyllotaxis and UPhy trajectories after Bonferroni correction (pcorrected < 0.05). Conclusion: FlexiPhy enables more reliable sequential binning recon- structions by reducing trajectory-induced ringing artifacts and temporal inconsistencies. Moreover, its randomized construction is not tied to a specific binning strategy, making it broadly compatible with retrospective binning approaches used in dynamic and motion-resolved MRI.
Preprint server:
bioRxiv
The authors list and abstract were imported from bioRxiv on 12 Jul 2026.
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