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FIG 3. Percent deviation of T1 estimates from uniformity along the superior-inferior direction for uncorrected and corrected data. Negative values on the abscissa correspond to inferior section locations. The data were corrected for RF inhomogeneity by using a procedure outlined by Alfano et al (6). Considering that the average distance between the landmark position at niason and the center of the coil was 3 cm and that the size of the brain including the cerebellum is approximately 7 cm, the region of interest (ie, supratentorial brain volume) was contained within the homogeneous region of the head coil (solid lines).
