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Overview

Compressed sensing has reinvigorated the field of non-Cartesian sampling in magnetic resonance imaging (MRI).Until now there has been no 3D radial view-order which meets all the desired characteristics for simultaneous dynamic/high-resolution imaging, such as for self-navigated motion-corrected high resolution neuroimaging.In this work, we examine the use of Hierarchical Equal Area iso-Latitude Pixelization (HEALPix) for generation of three-dimensional (3D) radial view-orders for MRI, and compare to a selection of commonly used 3D view-orders.The resulting trajectories were evaluated through simulation of the point spread function and slanted surface object suitable for modulation transfer function, contrast ratio, and SNR measurement.Results from the HEALPix view-order were compared to Generalized Spiral, 2D Golden Means, and Random view-orders.Finally, we show the first use of the HEALPix view-order to acquire in-vivo brain images.

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