Meeting Banner
Abstract #5458

The ultimate local SAR in realistic body models: Preliminary convergence results

Bastien Guerin1,2, Stephen F Cauley1,2, Jorge F Villena3, Athanasios G Polimeridis4, Elfar Adalsteinsson5,6,7, Luca Daniel7, Jacob K White7, and Lawrence L Wald1,2,5

1Radiology, Massachusetts General Hospital, Charlestown, MA, United States, 2Harvard Medical School, Boston, MA, United States, 3Cadence Design Systems, Feldkirchen, Germany, 4Skolkovo Institute of Science and Technology, Moscow, Russian Federation, 5Harvard-MIT Division of Health Sciences Technology, Cambridge, MA, United States, 6Institute for Medical Engineering and Science, Massachusetts Institute of Technology, Cambridge, MA, United States, 7Dept of Electrical Engineering and Computer Science, Massachusetts Institute of Technology, Cambridge, MA, United States

We extend our previously reported methodology for computation of the ultimate signal-to-noise ratio in realistic body models to the computation of the ultimate specific absorption rate (SAR) in the head of the Duke body model at 3 Tesla. We optimize 90° magnitude least-squares RF pulses subject to hundreds of thousands of SAR constraint for increasing numbers of electromagnetic fields in the basis set. As the size of the basis set increases, we show that the local SAR decreases toward a value that we call the “ultimate local SAR”.

This abstract and the presentation materials are available to members only; a login is required.

Join Here