Table 1: Speed-of-sound accuracy against the speed phantom measured with twin pistons.

AreaMean
(M/S)
SD
(M/S)
Uniformity
(%)
Actual
(M/S)
Error
(M/S)
Error
(% actual)
Error (SD)

High1571.918.11.15%15665.90.37%0.33
Low1418.85.690.40%140612.80.91%2.25
Water1508.67.090.46%15101.40.09%0.20
Background1447.96.240.43%14452.90.02%0.46