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Knowledge of T1 relaxation time is of great interest for clinical diagnosis or MRI sequence optimisation. For the quantitative measurement of T1, the inversion-recovery method is widely used due to its relatively good accuracy or tolerance to B1 inhomogeneity. However, 2D multi-slice- or 3D segmentation-based readout methods often preclude the effect of different signal recovery modulation depending on slice locations. Therefore, this work presents a single-slice-based inversion-recovery 2D EPI method, combined with TR-external EPI phase correction at 7T, to provide rapid, whole-brain T1 mapping with a voxel size of 0.73 × 0.73 mm2.
Yun et al. (Wed,) studied this question.