B-K Medical Pro Focus 2202, User Manual

Page: 217 / 356

General Pro Package 217
When the Doppler angle is turned off or altered, the results are recalculated.
Stenosis
The stenosis measurement uses the area of the vessel before or after the stenosis and
the area of the vessel at the stenosis (residual lumen) to calculate the degree (%) of
stenosis. You can base the stenosis calculation on the distance across the vessel or the
area of the vessel lumen.
Stenosis Based on Distance
1
Click ST Dist 1.
Measure the total lumen of the vessel.
2 Click ST Dist 2.
Measure the residual lumen of the vessel.
The ST Dist value is updated continuously on the screen if you move one of the
markers you reposition the markers.
Stenosis Based on Ellipses or Freehand Drawings
When you use areas to calculate stenosis, make one area measurement to measure
each of the following:
•
total lumen of the vessel
•
residual lumen of the vessel
The result on the screen is continuously updated while you position the second
ellipse or drawing.
VF (Volume Flow)
VF (Volume flow) is calculated by multiplying the time average mean velocity
(TAM) by a defined cross-section of a vascular structure. The cross-section is
measured on a B-mode image; the TAM is measured on a Doppler spectrum. These
do not have to be measured on the same scan.
You can calculate VF based on cross-section measures using a distance (VF Dist), an
ellipse (VF Ell) or a circle (VF Circ).
Doppler Angle
Active? (Yes/No) Velocity or Frequency
No Frequency measured at intersection of marker line and Doppler
curve.
Yes Velocity measured, and frequency parameters replaced by
corresponding velocity parameters, (dF by dV, FACC by ACC,
F1 and F2 by V1 and V2.)