Patent ID: 8686726
Filing Date: 2014-04-01
Classification: G01R

Abstract:
1. A magnetic resonance system comprising: a magnetic resonance scanner including a multi-channel radio frequency (RF) transmit system; an RF shimming processor configured to compute complex amplitude values for operative channels of the multi-channel RF transmit system based on a figure-of-merit comprising a weighted combination of a B an RF transmit sub-system configured to drive the multi-channel RF transmit system to excite magnetic resonance using the complex amplitude values computed by the RF shimming processor for the operative channels of the multi-channel RF transmit system, wherein the figure-of-merit comprising a weighted combination of the B1 uniformity measure and the total power measure is of a form of where spatial parameter x spans the volume of interest, where operator < . . . > denotes a statistical average or expectation over the volume-of-interest T n (x), n=1, . . . , N denotes the spatial transmit sensitivity distributions of operative channels of the multi-channel RF transmit system, λ is a weight parameter, A n , n=1, . . . , N denotes the complex amplitude values for the operative channels of the multi-channel RF transmit system, n is an index of an operative channel, and N is a total number of the operative channels.