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Abstract:
Introduction: The ‘‘dual refocusing echo acquisition mode’’ (DREAM) sequence is an ultrafast method for B0 and B1 field mapping in 2D [1], and 3D [4]. In this work, a magnetization prepared DREAM sequence is proposed. This combination yields the advan- tages of magnetic preparation as well as the B1, B0 and TxRx phase maps from the DREAM sequence. As an example for MP DREAM, an APTw CEST [2] preparation is used with the standard STE first DREAM sequence as a readout. In CEST measurements, it is of great importance to correct the acquired CEST-spectra with accurate B1 and B0 maps. Until now, it was only possible to acquire B1 and B0 maps before or after the CEST measurement. With DREAM CEST, it is possible to acquire corresponding B1 and B0 reference maps for every single CEST offset.
