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Abstract #0855

Improved High-Resolution SNAILS DTI with A Spiral-in Navigator

Moseley M, Bammer R, Liu C
Stanford University

Variable density (VD) spiral has been applied in SNAILS for the acquisition of high-resolution diffusion weighted images. By oversampling the center of k-space, SNAILS provides the capability to navigate the motion-induced phase errors. However oversampling increases off-resonance blurring. A method is proposed to improve SNAILS by applying a spiral-in phase navigator. This extra navigator reduces the oversampling factor of the VD spiral, while maintaining a reasonable high SNR to compensate residual artifacts. In vivo high-resolution DTI is demonstrated using two VD spiral pitch factors. The navigator enables a smaller pitch factor and improves the image SNR and contrast.