Optimizing B-Mode
LOGIQ 7 Online Help
5
-
55
Direction 2392536-100 Rev. 1
Curve Fit
1. Select
Curve Fit
.
OR
Position the cursor over the analysis window and press the
left
Set
key. The system menu displays at the cursor
position. Select
Curve Fit
.
2. The Curve Fit selection list displays.
Figure 5-28. Curve Fit Selection List
•
Off
—Remove the fitted curves from the plot and the fit
parameters from the display.
•
Wash-in
—Used to find and estimate the local perfusion rate
using the contrast agent. Expotential wash-in is described
by the function:
Y(t) = A(1-exp(-kt))+B, where :
•
A (dB or AU) is the intensity from the contrast agent.
•
B (dB or AU) is the intensity at time t=0 (defined as the
time of the left marker). This corresponds to the tissue
(baseline) signal if no contrast is present at the selected
starting point.
NOTE:
A + B = co tissue = plateau level.
•
k (1/s) is a time constant.
•
Wash-out
—Used to find and estimate a local wash-out rate.
Expotential wash-out is described by the function:
Y(t) = Aexp(-kt)+B, where :
•
A (dB or AU) is the intensity from the contrast agent.
•
B (dB or AU) is the intensity from the tissue = baseline
signal.
NOTE:
A + B is the initial intensity level.
•
k (1/s) is a time constant.
Содержание LOGIQ 7
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