IMPULSE: A scalable algorithm for design of minimum specific absorption rate parallel transmit RF pulses.

ABSTRACT:

Purpose

Managing local specific absorption rate (SAR) in parallel transmission requires ensuring that the peak SAR over a large number of voxels (> 10 5 ) is below the regulatory limit. The safety risk to the patient depends on cumulative (not instantaneous) SAR thus making a joint design of all RF pulses in a sequence desirable. We propose the Iterative Minimization Procedure with Uncompressed Local SAR Estimate (IMPULSE), an efficient optimization formulation and algorithm that can handle uncompressed SAR matrices and optimize pulses for all slices jointly within a practical time frame.

Theory and methods

IMPULSE optimizes parallel transmit pulses for small-tip-angle slice selective excitation to minimize a single cost function incorporating multiple quantities (local SA

SUBMITTER: Pendse M 

PROVIDER: S-EPMC6372346 | biostudies-literature | 2019 Apr

REPOSITORIES: biostudies-literature