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Measurement and Analysis
124
Vivid i User’s Manual
2378958-100 Rev. 02
Doppler Measurements
The following measurements may be calculated on Doppler
mode spectra:
For measurement
formulae, refer to
the
Reference
Manual .
• Maximum (peak) and mean velocity
• Maximum and mean pressure gradient
• Pressure half-time (PHT)
• Velocity time integral (VTI)
• Mitral valve area (MVA), derived from PHT
Velocity and Pressure point measurements
1. Generate the spectrum to be measured.
2. Press
FREEZE
to stop the cineloop.
3. Press
MEASURE
on the Control Panel.
4. Select Point Caliper in the Measurement Menu .
5. Trackball the cursor to the position to measure.
The current velocity is displayed in the
Measurement result
table and is instantaneously updated when moving the
cursor.
The measurement
display on the spec-
trum and the corre-
sponding results
are numbered. 6. Press
SET
to anchor the point.
The velocity (m/s) and pressure (mmHg) values are
displayed in the
Measurement result table .
Velocity and Pressure caliper measurements
1. Generate the spectrum to be measured.
2. Press
FREEZE
to stop the cineloop.
3. Press
MEASURE
on the Control Panel.
4. Select Caliper in the Measurement Menu .
5. Trackball the cursor to the start point of the measurement.
6. Press
SET
to anchor the start point of the measurement.
7. Trackball the cursor to the measurement end point.
The current velocity and pressure values are displayed in
the
Measurement result table and are instantaneously
updated when moving the cursor.
The measurement
display color on the
spectrum changes
from green to red af-
ter completion of
the measurement.
8. Press
SET
to anchor the end point of the measurement.
The following measurement results are displayed in the
Measurement result table :
• Velocity and pressure at anchor point positions
• Velocity (V3) and pressure (p3) differences between