Fig. 4.
X-axis: Mean ± SD iron concentration (mg/100 g fresh weight) determined postmortem in each ROI (Hallgren and Sourander, 1958). Y- axis: Mean ± SD ℓ1-regularized QSM in ppm (left) and FDRI in s−1/Tesla (right) indices in all 23 subjects (black squares); the gray circles indicate the mean of the young group, and the open circles indicate the mean of the elderly group.
