SVD Based Calibration of Transmit Arrays

David Otto Brunner¹, Klaas Paul Pruessmann¹

Using transmit-receive arrays the acquisition of transmit and receive sensitivities are both of crucial importance but there are also great difficulties involved in bootstrapping such a process. In regions of low excitation, the receive sensitivities cannot be estimated correctly, leading to strong noise enhancement in the reconstructed images as well as in the transmit calibration data. This noise then propagates into the calculated transmit profiles hindering transmit calibration. In this work we present an acquisition and reconstruction technique that solves this entangled problem and allows finding concomitantly the signal optimal global RF shims and local receive channel combinations.