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Abstract:
Introduction: The ‘‘dual refocusing echo acquisition mode’’ (DREAM) sequence is one of the fastest methods for B1 mapping in 2D, and 3D [1]. The DREAM sequence acquires two signals jointly, the stimulated echo (STE), and a free induction decay (FID) signal. The STE decays to zero, while the FID signal approaches a steady state via a T1 Look-Locker-decay, leading to a strong signal blurring affecting intensity and contrast of both, the STE and FID image. The DREAM sequence can be used to acquire a prepared magnetization [2], thus also an anatomical magnetization prepared (MP) image can be generated, which also suffers from blurring artifacts. To improve the MP-DREAM image quality, we optimized the readout flip angle (FA) train using the end-to-end approach MR-zero [3].
