SAR REDUCTION IN MR IMAGING WITH PARALLEL RF TRANSMISSION

摘要

PPROBLEM TO BE SOLVED: To provide a parallel excitation pulse design that reduces RF power deposition on a subject. PSOLUTION: This invention acquires a B1 magnetic field map for each transmission coil (72) of a parallel RF transmission coil array (70), and determines using a computational algorithm an excitation pulse scheme for a target excitation profile based on an effective B1 magnetic field map for a plurality of the transmission coils (72) of the parallel RF transmission coil array (70), and generates SAR-reduced RF pulse sequence for a respective transmission coil of a plurality of the transmission coils (72) of the parallel RF transmission coil array (70). The parallel RF transmission coil array (70) is capable of having any parallel RF transmission coil array geometry. Each effective B1 magnetic field map reflects inductive coupling effects present between the transmission coil (72) and at least another transmission coil (72). PCOPYRIGHT: (C)2008,JPO&INPIT