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ROIs of the fourth vertebral bone marrow in a healthy 24-year-old woman (A) and in a healthy 24-year-old man (B). The combination of their logarithmic plot of signal intensity decay and bi-exponential fitting curves (C), the signal intensity decays more quickly in men than that in women within b< 200 s/mm2. The bi-exponential fitting curves for women (red line) and men (green line) are cross instead of parallel.
