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. Author manuscript; available in PMC: 2010 Jul 9.
Published in final edited form as: Magn Reson Med. 2010 Jun;63(6):1510–1519. doi: 10.1002/mrm.22337

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Scatter plots of axon density (AD) vs. fractional anisotropy (FA), axon area-fraction (AAF) vs. FA, and AD vs. transverse apparent diffusion coefficient (tADC) for the four slices of the spinal cord specimen. Solid lines show linear regression lines for collectively analyzed white and gray matter regions. The separation of gray matter pixels (red dots) and white matter pixels (blue dots) was achieved by manual segmentation. Pearson correlation coefficients in each plot are denoted by r. A blue r refers to the correlation coefficient of white matter only and a black r refers to the correlation coefficient of the combined white and gray matter regions.