Table 2.

Pearson correlation coefficients (r), between axon density (AD) and fractional anisotropy (FA), axon area-fraction (AAF) and FA, AD and transverse apparent diffusion coefficient (tADC), AAF and tADC, AD and longitudinal apparent diffusion coefficient (lADC), and AAF and lADC for the white matter region only. The last two rows show the average value and the standard deviation (Std Dev) of this data over all four slices.

Correlation Coefficients for Axon Packing vs. Diffusion Measurements for White Matter Only
	AD vs. FA	AAF vs. FA	AD vs. tADC	AAF vs. tADC	AD vs. lADC	AAF vs. lADC
	r	r	r	r	r	r
Slice 1	0.29	0.26	–0.28	–0.41	–0.07	–0.34
Slice 2	0.51	0.33	–0.41	–0.39	0.05	–0.14
Slice 3	0.37	–0.08	–0.50	–0.16	–0.23	–0.33
Slice 4	0.29	0.34	–0.40	–0.49	–0.30	–0.38
Average	0.37	0.21	–0.40	–0.36	–0.14	–0.30
Std Dev	0.11	0.20	0.09	0.14	0.16	0.11