Parallel transmission RF pulse design with local SAR constraints

US8653818B2 · kind B2 · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Elfar Adalsteinsson · Belmont, US
• Joonsung Lee · Suwon-si, KR
• Lawrence L. Wald · Cambridge, US
• Matthias Gebhardt · Erlangen, DE

Key dates

• Filing date: Apr 8, 2011
• Grant date: Feb 18, 2014
• Expiry date: Feb 15, 2032

Classification

• Technology area (CPC G): Physics
• CPC primary: G01R33/288
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A method of designing a parallel transmission radio frequency (RF) pulse for a magnetic resonance imaging (MRI) system includes compressing a model for a subject to be scanned by the MRI system into a plurality of voxel clusters, each voxel cluster defining a virtual observation point with a peak sensitivity to local specific absorption rate (SAR) for the voxel cluster, and defining the parallel transmission RF pulse based on an approximation of a minimization criterion having a local SAR component based on the peak sensitivity of each virtual observation point, the approximation comprising a weighted sum of the local SAR values for each virtual observation point.