Accelerated Abdominal 3D T1rho Mapping using Diamond Radial Sampling

Motivation: Current T1rho mapping of the abdomen is performed using breath-hold, respiratory triggering, or stack-of-stars acquisitions, which have limited spatial resolution and coverage or require a long scan time. Goal(s): To develop accelerated free-breathing 3D T1rho mapping technique for the abdomen using efficient diamond sampling. Approach: Free-breathing 3D T1rho imaging was performed on six volunteers using the MAPSS sequence. T1rho values were compared between stack-of-stars and diamond sampling. Results: The scan time was reduced from 5:24min per TSL for stack-of-stars to 2:26min per TSL for diamond sampling. The T1rho values obtained with both methods were comparable. Impact: The proposed free-breathing 3D T1rho mapping of the abdomen with accelerated diamond sampling has the potential to provide a quantitative assessment of abdominal lesions for improved diagnosis and treatment response evaluation.