Spiral T1w-Dixon-VIBE for high resolution abdominal imaging at 0.55T

Motivation: Breath-held abdominal fat-suppressed imaging is challenging at mid- and low-field strengths (<1.5T). Fat saturation often fails due to the short T1 of lipid; and Cartesian Dixon imaging provides poor spatial resolution due to the need for long ∆TE, due to the smaller ∆f between water and lipid. Goal(s): Breath-held fat-suppressed high-resolution volumetric abdominal imaging with T1 contrast. Approach: Stack-of-Spirals Dixon imaging, with estimation and compensation for phase due to concomitant fields Results: We demonstrate that spiral Dixon imaging at 0.55T makes excellent use of the required ∆TE, improving SNR efficiency and spatial resolution (1.7x1.7x5.0mm3) compared Cartesian Dixon (3.5x3.5x5.0mm3), within a 17-second breath-hold. Impact: We demonstrate that spiral Dixon single breath-hold volumetric imaging is an attractive alternative to existing Cartesian-based methods for volumetric single breath-hold fat-suppressed imaging at 0.55T, as it simultaneously provides high-resolution and excellent fat-suppression.