Table 2.

Comparison of Recovery-Curve-Based and Pixel-Based Estimation for Pure Diffusion and for Some Different Parameters

D (m2/s)	a	$M\left({\hat{D}}^{\left(\text{rc}\right)}\right)$	$S\left({\hat{D}}^{\left(\text{rc}\right)}\right)$	$M\left({\hat{D}}^{\left(\text{px}\right)}\right)$	$S\left({\hat{D}}^{\left(\text{px}\right)}\right)$	ER(D)
5 × 10−12	0.01	5.12 × 10−12	1.92 × 10−13	5.01 × 10−12	2.58 × 10−14	0.015
5 × 10−12	0.05	5.30 × 10−12	4.51 × 10−13	5.03 × 10−12	5.58 × 10−14	0.013
5 × 10−12	0.10	5.40 × 10−12	6.33 × 10−13	5.04 × 10−12	8.03 × 10−14	0.014
1 × 10−11	0.01	1.01 × 10−11	2.57 × 10−13	1.00 × 10−11	5.28 × 10−14	0.037
1 × 10−11	0.05	1.03 × 10−11	5.46 × 10−13	1.01 × 10−11	1.15 × 10−13	0.041
1 × 10−11	0.10	1.05 × 10−11	8.33 × 10−13	1.01 × 10−11	1.65 × 10−13	0.035
5 × 10−11	0.01	5.05 × 10−11	1.63 × 10−12	5.01 × 10−11	3.94 × 10−13	0.058a
5 × 10−11	0.05	5.13 × 10−11	3.93 × 10−12	5.02 × 10−11	8.39 × 10−13	0.044
5 × 10−11	0.10	5.15 × 10−11	5.69 × 10−12	5.04 × 10−11	1.28 × 10−12	0.051
1 × 10−10	0.01	1.01 × 10−10	5.37 × 10−12	1.00 × 10−10	1.05 × 10−12	0.038
1 × 10−10	0.05	1.03 × 10−10	1.28 × 10−11	1.01 × 10−10	2.29 × 10−12	0.032
1 × 10−10	0.10	1.05 × 10−10	1.82 × 10−11	1.01 × 10−10	3.28 × 10−12	0.031
5 × 10−10	0.01	5.24 × 10−10	1.31 × 10−10	5.02 × 10−10	1.14 × 10−11	0.007
5 × 10−10	0.05	5.74 × 10−10	2.92 × 10−10	5.04 × 10−10	2.50 × 10−11	0.007
5 × 10−10	0.10	6.77 × 10−10	4.55 × 10−10	5.06 × 10−10	3.36 × 10−11	0.005

^aThis number is the “worst case.”