FIG 4. Trend of lower baseline signal intensity was more prominent for gradient-echo (GRE) sequence. Error bars indicate SD ± 1. Measured values were normalized with temporal white matter (WM), and y axis thus represents gray matter:white matter ratio (*, P < .05; **, P < .005; unpaired t test). Columns with statistically significant differences between gradient-echo and spin-echo (SE) sequences are marked (, statistically significant difference between gradient-echo and spin-echo sequences with P < .05). Columns marked by these symbols represent those with higher values.

A, Measurements of the baseline signal intensity by gradient-echo echo-planar imaging.

B, Measurements of the baseline signal intensity by spin-echo echo-planar imaging.

C, Measurements of maximum magnitude of signal change by gradient-echo echo-planar imaging.

D, Measurements of maximum magnitude of signal change by spin-echo echo-planar imaging.