Measurement and Analysis
Vivid S5/Vivid S6 User Manual 303
R2424458-100 Rev. 2
axial view. One measurement is usually made in the sagittal
plane and two measurements in the axial plane.
When doing volume calculation from one or two distance
measurements, make one or two distance measurements
and press
MENU.
The distance measurement(s) and the volume calculation
are displayed in the Measurement result table.
A/B Ratio
In B-Mode, A/B Ratio can be measured by diameter or area.
A/B Ratio by diameter
1. Press
MEASURE on the control panel.
2. Open A/B Ratio in the Measurement menu.
3. Select between:
• Ratio (Diam)
• Ratio (Area)
4. Make the corresponding two measurements.
The measurements and the corresponding A/B Ratio are
displayed in the Measurement result table.
Intima-Media Thickness
The Intima-Media Thickness (IMT) is calculated based on
automatic contour detection of the Intima and Media layers on
a user-defined search region along the vessel wall. Multiple
IMT measurements are made between pairs of intima and
adventitia points along the wall (Figure 7-34). IMT can be
measured both on the posterior and the anterior walls of the
vessel.
The IMT measurement is available with linear probes only.
Note: due to the physical properties of ultrasound imaging, the
posterior IMT measurement is generally more accurate than
the anterior IMT measurement.
The following parameters are calculated:
• Average IMT
• Maximum IMT
• Minimum IMT
• Standard deviation of IMT measurements
• Number of successful IMT measurements
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