TABLE 2.

Comparison of R₂* Values Between 3-D and 2-D mGRE Sequences at 3.0 T^*

	Cortex R2* (s−1)	Medulla R2* (s−1)
3-D (8 echoes)	18.5 ± 2.6	37.7 ± 3.8
2-D (8 echoes)	20.5 ± 2.9†	36.6 ± 3.0
2-D (16 echoes)	22.0 ± 3.1†	36.7 ± 2.2

^*Shown are mean ± standard deviation for cortex and medulla over all subjects. A single mean value for each subject was obtained by placing pairs of regions of interest (cortex and medulla) in each slice acquired.

^†P < 0.05 by paired 2-tailed t test when compared with 3-D mGRE.