Measurement 8-5
Parameter
Value Range
Error
Distance (M
mdoe)
Full screen
Within ±3 %.
Time (M mdoe)
Timeline Display
Within ±2%.
Heart rate
Timeline Display
Within ±4%.
Velocity (PW
mode)
10-200cm/s (for V11-3HU, L14-6WU,
L20-5U)
10-300cm/s (for C5-1U, SC8-2U, D8-4U,
DE10-3U, L11-3U, SP5-1U, SC5-1U,
DE11-3U)
0-400cm/s (for L9-3U)
0-180cm/s (for L14-5WU)
When angle≤60º, ≤5%.
Velocity (CW
mode)
10-300cm/s (for SP5-1U)
When angle≤60º, ≤5%. (not including
pencil probe)
Table 4 Error of STE Images
Parameter
Error
Probe
L11-3U L14-6WU L9-3U L14-5WU SC5-1U C5-1U SC6-1U
Expected max Detect Depth
(cm)
≥ 3
≥ 2
≥ 3
≥ 3
≥ 3
≥ 3
≥ 3
Space resolution(mm)
≤ 10.5
Geometric Error
Within 70%
Accuracy and Repetition
rate of speed
Error
≤ 70%; Repetition rate ≤ 20%
Note: The speedy is converted into a stiffness value by the formula:
Stiffness = Speed
2
*3 *
ρ
,
ρ = 1.
The unit of
ρ is g/cm
3
.
Table 5 Error of STQ
Parameter
Error
Accuracy of Stiffness
≤ 70%
Table 6 Other Measurements
Function
Measurement item
Error
R-VQS
Sampling frame accuracy
Within ±3 %.
Vessel diameter measurement
Within ±3 %.
Displacement measurement
Within ±10 %.
STE/STQ
Directional Ratio
Within ±3 %.
Elas. Hist measurement
Within ±3 %.
