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Abstract #1449

Parallelized Algorithm for the Computation of N-Gram Specific Absorption Rate (SAR) on a Graphics Processor

Lohith Kini1, Matthias Gebhardt2, Khaldoun Makhoul3, Lawrence L. Wald3,4, Elfar Adalsteinsson1,4

1EECS, Massachusetts Institute of Technology, Cambridge, MA, United States; 2Siemens Medical Solutions, Erlangen, Germany; 3MGH, Harvard Medical School, A. A. Martinos Center for Biomedical Imaging, Charlestown, MA, United States; 4Harvard-MIT Division of Health Sciences and Technology, MIT, Cambridge, MA, United States

Specific Absorption Rate (SAR) is a major concern in parallel transmission. Calculating the average N-gram SAR arising at each spatial location is a computationally intractable problem. We propose and demonstrate improvements to a recent algorithm, the fast region-growth algorithm, and exploit its parallelizable computation structure by implementing it on a commercial graphics card. This algorithm is up to 4-7 times faster in runtime regardless of model resolution and number of RF pulse time samples while maintaining accuracy with the fast region-growth algorithm.