Characterization of the B1-transmit field (B1+) is important for many quantitative imaging techniques. Here, we present a novel, silent, B1+-mapping technique using a magnetization prepared zero-echo time 3D radial sequence. The proposed technique, named SIMBA, is shown to correspond very well to a standard 2D B1+-mapping technique (Bloch-Siegert). The efficacy of the technique is shown by correction of quantitative T1-maps obtained using the variable flip angle method.
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