Image Optimization 5-89
Tips: Elliptical ROIs can be positioned in any manner that keeps their center within the image
boundaries. In the case that part of the ROI is outside the image boundary, only data from within
the image boundary is used for calculating the mean intensity value.
X Scale
Rotate the knob under [X Scale] on the touch screen to choose different value, so that the X scale
display manner will be changed. This function can be used to track detailed tissue information.
Export/Save Trace Data
1. Touch [Export] on the touch screen.
2. Select the drive and enter the file name in the displayed window.
3. Select [OK] to save the data and return to the QA Analysis screen.
All displayed ROI traces are saved in the exported file.
The parameters are included in the trace file if the user has fixed a ROI.
After the exporting is succeeded, a .BMP format image is displayed in the thumbnail area.
Only data from the user selected image range is included in the exported trace file.
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.
Touch [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.
Touch [Raw Curve] to hide/display raw curve, when the button is highlighted in green, raw
curve is displayed.
Touch [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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