Table 2.

Speckle tracking displacement error

	5 mm/s			10 mm/s			15 mm/s
	Mean	CV1%	CV2%	Mean	CV1%	CV2%	Mean	CV1%	CV2%
5 mm	1.2 ± 0.4	2.1	2.7	1.1 ± 0.5	3.1	11.7	0.7 ± 0.2	3.8	3.3
10 mm	3.4 ± 0.2	6.8	1.4	2.4 ± 1.1	9.2	3.8	2.0 ± 0.6	5.0	5.0
15 mm	4.3 ± 1.1	3.7	11.5	4.4 ± 1.0	8.6	7.5	4.0 ± 1.0	7.5	18.1

Mean absolute error ± SD (mm) in speckle tracking displacement estimation for porcine tendons 1 and 2. The labels in the table correspond to the settings of the materials testing machine. The 5, 10 and 15 mm displacement settings resulted in 4.1, 8.4 and 12.1 mm displacements and the 5, 10 and 15 mm/s velocity settings resulted in 4.1, 7.7 and 11.5 mm/s as found by manual tracking. Speckle tracking underestimated displacement for all conditions. Coefficients of variation (%) are presented for porcine tendons 1 (CV₁) and 2 (CV₂) for each displacement and velocity