Accuracy Verification of Magnetic Resonance Imaging (MRI) Technology for Lower-Limb Prosthetic Research: Utilising Animal Soft Tissue Specimen and Common Socket Casting Materials

Table 1

The minimum, maximum, and mean difference and absolute difference, Pearson Correlation Coefficient, the results of paired samples t-test significance, and 95% confidence interval of the difference.

Measurement difference	Material	n	Absolute difference				Difference				Correlation coefficient (𝑃)^∗	𝑃 (95% CI of the difference)
			Min (%)	Max (%)	Mean (%)	SD	Min (%)	Max (%)	Mean (%)	SD
Calliper—photo diameter measurement (mm)	NA	24	0.04 (0.03)	1.67 (2.29)	0.77 (0.85)	0.49	−1.31 (−1.29)	1.67 (1.65)	−0.18 (−0.17)	0.09	0.999 (0.000)	0.326; (−0.56, 0.19)
MRI—photo diameter measurement (mm)	POP	12	0.11 (0.08)	1.25 (1.53)	0.66 (0.73)	0.36	1.25 (−1.53)	0.61 (0.81)	−0.31 (−0.33)	0.71	1.000 (0.000)	0.16; (−0.14, 0.76)
	Silicone	12	0.24 (0.19)	1.20 (1.59)	0.73 (0.79)	0.26	−1.20 (−1.59)	0.74 (1.17)	−0.42 (−0.41)	0.67	1.000 (0.000)	0.053; (−0.01, 0.84)
MRI—photo Surface area measurement (mm^2)	POP	6	6.33 (0.05)	51.03 (0.78)	24.31 (0.35)	18.54	−15.06 (−0.10)	51.03 (0.78)	19.29 (0.31)	24.62	1.000 (0.000)	0.113; (−6.55, 45.13)
	Silicone	6	15.83 (0.12)	68.87 (1.04)	37.72 (0.51)	21.25	−15.83 (−0.12)	68.87 (1.04)	32.44 (0.47)	29.93	1.000 (0.000)	0.045; (1.03, 63.85)
MRI—water suspension volume measurement (mm^3)	POP	3	8855 (1.31)	9443 (4.31)	9110 (2.72)	301	−8855 (−1.31)	9443 (4.31)	3207 (1.85)	10448	1.000 (0.000)	0.648; (−17689, 24103)
	Silicone	3	831 (0.13)	10243 (3.00)	5521 (1.79)	4706	−10243 (−3.00)	−831 (−0.13)	−5521 (−1.79)	4706	1.000 (0.009)	0.179; (−14933, 3890)

*Correlation is significant at alpha = 0.01.