5-32 Image Optimization
Curve Fitting
The system can calculate characteristic parameters according to curve fitting formula and data,
display fit curve for time-intensity curve, and perform data analysis on time-intensity curve for data
table.
Tap [Fit Curve] on the touch screen to turn on the function, where color of the fitted curve
is consistent with color of the current ROI curve.
Tap [Raw Curve] to hide/display raw curve.
Tap [Table Display] to check parameters.
Parameters calculated include the following:
GOF (Goodness of Fit): to calculate the fit degree of the curve; range: 0-1, where 1 means
the fit curve fits the raw curve perfectly.
BI (Base Intensity): basic intensity of no contrast agent perfusion status.
AT (Arrival Time): time point where contrast intensity appears, generally, the actual time
value is 110% higher than the base intensity.
TTP (Time To Peak): time when the contrast intensity reaches peak value.
PI (Peak Intensity): contrast peak intensity.
AS (Ascending Slope): ascending slope of contrast, the slope between the start point of
lesion perfusion to the peak.
DT/2: time when the intensity is half the value of the peak intensity.
DS (Descending Slope): descending slope of the curve.
AUC (Area Under Curve): to calculate the area under the time-intensity curves during
contrast.
If the contrast signal inside the selected ROI does not meet the requirements of
gamma fitting condition, that is the bulleting injection, curve fitting may not be
available.
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