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A p p e n d i x A T e c h n i c a l D e s c r i p t i o n
Virtual Touch Quantification
Clinical Measurements: Range and Accuracy
Direct Measurement
Range
Shear Velocity (Vs)
0.8 – 3.65 m/s
3.65 – 5.0 m/s
Shear Velocity (Vs)
0.8 – 6.1 m/s
6.1 – 8.4 m/s
Elasticity (E)
1.9 – 40.0 kPa
40.0 – 75.0 kPa
Elasticity (E)
1.9 – 111.6 kPa
111.6 – 211.7 kPa
Virtual Touch IQ
Clinical Measurements: Range and Accuracy
Direct Measurement
Range
Shear Velocity (Vs)
0.5 – 10.0 m/s
Elasticity (E)
0.8 – 300.0 kPa
A - 3 6
Tolerance
Symbol
Tolerance Function or Value (Accuracy)
Tol(Vs)
(Applies to the 4C1, 4V1, and 6C1 HD transducers)
±20% of the velocity over the depth range of
0.5 - 8.0 cm
Tol(Vs)
(Applies to the 4C1, 4V1, and 6C1 HD transducers)
±30% of the velocity over the depth range of
3.0 - 6.0 cm
Tol(Vs)
(Applies to the 9L4 transducer)
±20% of the velocity over the depth range of
0.5 - 4.0 cm
Tol(Vs)
(Applies to the 9L4 transducer)
±40% of the velocity over the depth range of
0.5 - 2.0 cm
Tol(E)
(Applies to the 4C1, 4V1, and 6C1 HD transducers)
±20% of the elasticity over the depth range of
0.5 - 8.0 cm
Tol(E)
(Applies to the 4C1, 4V1, and 6C1 HD transducers)
±30% of the elasticity over the depth range of
3.0 - 6.0 cm
Tol(E)
(Applies to the 9L4 transducer)
±20% of the elasticity over the depth range of
0.5 - 4.0 cm
Tol(E)
(Applies to the 9L4 transducer)
±40% of the elasticity over the depth range of
0.5 - 2.0 cm
Tolerance
Symbol
Tolerance Function or Value (Accuracy)
Tol(Vs)
±20% of the velocity over the range of 0.5 – 10.0 m/s
Tol(E)
±20% of the elasticity over the range of 0.8 –
300.0 kPa
I n s t r u c t i o n s f o r U s e
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