Hadamard Encoding of 2D-Selective RF Excitations for Simultaneous Acquisition of Multiple, Irregularly Shaped Voxel in MR Spectroscopy

Martin G. Busch^1,2, Jrgen Finsterbusch^1,2

2D-selective RF (2DRF) excitations are able to excite arbitrarily shaped regions-of-interest within the plane defined by their trajectory. They have been applied to single-voxel MR spectroscopy to minimize partial volume effects by using an excitation profile that matches the shape of the desired target region. In this study, it is shown that Hadamard encoding of different target regions can be used to acquire multiple, irregularly shaped voxel simultaneously which increases the SNR efficiency accordingly. Experiments in a dedicated phantom using segmented, blipped-planar 2DRF excitations demonstrate that the different ROIs can be eliminated reliably.