Measurement
While in ARFI display, generic measurements can be done on the image using the Calc and
Caliper buttons, in addition to the ARFI calculations in kPa and m/s.
CAUTION:
1. The values for ARFI velocity and stiffness are relative indices intended only
for the purpose of comparison with other measurements performed using the
ZS3. Absolute values for these measurements may vary among different
measurement devices.
2. This ARFI function is only used to measure objects larger than 10mm. If the
object is smaller than 10mm, this function might not be reliable.
ARFI Result Type: kPa, Velocity, or kPa+m/s
You can measure the ARFI Velocity by following these following steps:
1. Select C4-1 probe under an Abdominal Category preset.
2. Press <ARFI> self-defined key to enter ARFI imaging mode.
3. Adjust the ROI based on the depth and the position.
4. Adjust [Unit Type] parameter to display desired unit/s.
5. Press the <Select> key to start an ARFI acquisition. The ARFI Velocity result window will
display on the image area.
The stiffness is converted into a velocity value by the formula:
ARFI velocity =
√
stiffness
,
ρ
= 1.03.
3*
ρ
The measurement accuracy of the ARFI velocity is about 50%, and the measure repeatability
of the ARFI velocity is about 20%
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