SNR-Efficient Anisotropic 3D Ultra-Short Echo Time Sequence for Sodium MRI with Retrospective Gating

Most sodium MR studies are performed using 3D ultra-short echo time (UTE) sequences with isotropic resolution. For some applications, however, anisotropic resolution is preferred to reduce partial-volume effects that hamper sodium quantification. No analytical formula could be found for the azimuth angle to acquire k-space uniformly on an ellipsoidal surface using the golden ratio (GR). In this work, a 3D acquisition scheme is presented to achieve high SNR efficiency for UTE imaging with anisotropic resolution and retrospective gating using the GR. This SNR gain can be invested in higher resolutions and/or measurement time, which is important for sodium MRI.

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