Table 2.

Comparison between EAR and FA of the 3 tissue types.

ROI		EAR			FA			SNR Improvement
		SNR	Mean EAR	Std. Dev	SNR	Mean FA	Std. Dev
WM	1	6.56	0.811	0.087	4.39	0.739	0.119	49%
	2	6.98	0.841	0.085	4.78	0.784	0.116	46%
	3	7.37	0.824	0.079	4.63	0.750	0.115	59%
	4	6.19	0.807	0.092	4.23	0.738	0.123	46%
	5	7.68	0.838	0.077	5.25	0.781	0.105	46%
	Average	6.96	0.824	0.084	4.66	0.758	0.116	49%
GM	1	2.81	0.251	0.063	2.71	0.157	0.041	4%
	2	4.76	0.281	0.042	4.14	0.180	0.031	15%
	3	2.87	0.263	0.065	2.87	0.163	0.040	0%
	4	2.11	0.220	0.074	1.79	0.143	0.057	18%
	5	3.12	0.254	0.058	3.05	0.160	0.037	2%
	Average	3.13	0.254	0.060	2.91	0.161	0.041	8%
CSF	1	2.38	0.141	0.042	2.28	0.080	0.025	4%
	2	1.88	0.153	0.058	1.93	0.084	0.031	−3%
	3	2.10	0.155	0.052	2.12	0.086	0.029	0%
	4	1.73	0.140	0.057	1.47	0.080	0.038	18%
	5	2.15	0.148	0.048	2.06	0.083	0.028	4%
	Average	2.05	0.147	0.051	1.97	0.083	0.030	4%~5%

WM: white matter (the combination of all 8 ROIs in Table 1); GM: gray matter; CSF: cerebral-spinal fluid; EAR: ellipsoidal area ratio; FA: fractional anisotropy; SNR: signal-to-noise ratio.