ITERATIVE MINIMIZATION PROCEDURE WITH UNCOMPRESSED LOCAL SAR ESTIMATE

摘要

A method for providing an image of a subject in a magnetic resonance imaging MRI system with parallel transmission (pTx) is provided. A localizer scan of the subject is provided. Body anatomy is determined from the localizer scan. The body anatomy is matched with at least one body model of a plurality of body models. B1+ and Bo maps are calculated from the body anatomy. The electric fields from the at least one body model and constraints are used to simultaneously determine a plurality of excitation pulses for a pTx. MRI is performed on the subject using the determined excitation pulses. Global SAR is monitored in real time to ensure all time-averaged constraints are satisfied simultaneously.

主权项

1. A method for providing an image of a subject in a magnetic resonance imaging MRI system with parallel transmission (pTx), comprising:
a) providing a localizer scan of the subject; b) determining body anatomy from the localizer scan; c) matching the body anatomy with at least one body model of a plurality of body models; d) calculating B1+ and Bo maps from the body anatomy; e) using the electric fields from the at least one body model and constraints to simultaneously determine a plurality of excitation pulses for a pTx; f) performing MRI on the subject using the determined excitation pulses; g) monitoring global SAR in real time to ensure all time-averaged constraints are satisfied simultaneously.