The traditional RF-prepared B1 mapping technique consists of one scan with an RF preparation module for FA-encoding and a second scan without this module for normalizing. To reduce the T1-induced k-space filtering effect, this method is limited to 2D FLASH acquisition with a two-parameter method. Based on the point spread function analysis of FLASH readout, a novel 3D RF-prepared three-parameter method for B1-mapping is proposed to correct the T1-induced quantification bias. The proposed technique was compared with existing methods in the brain, breast, and abdomen and demonstrated with high accuracy for ultrafast B1 mapping.
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