Correction of 2D RF Pulses

Two dimensional (2D) RF pulses with EPI excitation trajectory are extremely sensitive to system imperfections such as eddy currents and waveform distortions. These imperfections cause stop band excitation and pass band saturation. A method to correct these 2D RF pulses is presented. The correction is done by adding a phase to even sub pulses and gradient blips to the oscillatory excitation gradient. The added phase and the area of the blips are determined by a calibration done at system installation. The method was applied successfully to spectral spatial RF pulses at oblique and non oblique slice orientations.

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