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 B 1 + and B 0 maps from the body anatomy; e) using electric fields from the at least one body model and constraints to simultaneously determine a plurality of excitation pulses for a pTx performed as an optimization problem with a single objective term consisting of all time-averaged quantities including local SAR, global SAR, and average power and constraints on instantaneous quantities including flip angle inhomogeneity resulting from each pulse and instantaneous power applied to each channel, wherein local SAR matrices at all voxels are included in the objective term without compression; 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; and h) providing an image from the performing the MRI on the subject and monitoring the global SAR in real time.