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5.9.4.2
Basic TDI QA Procedures
Setting the ROI
This function is used for setting the TDI QA target.
Up to eight ROIs can be saved on the reference image, with the corresponding eight
traces plotted simultaneously on the graph. Each ROI display has a different color, and its
corresponding trace data is plotted with the same color.
There are two different methods for determining the shapes of the sample area: Standard
ROI and Freehand ROI.
ROI types:
Standard ROI: if selected, the ROI is drawn automatically with its shape
determined by "Standard Height/Width/Angle".
Ellipse ROI: if selected, the ROI is drawn by the trackball.
Standard ROI
1. Tap [Standard ROI] on the touch screen.
2. Browse the image to a desired frame.
3. When the trackball positions the cursor over the reference image(s), an elliptical ROI
is automatically generated and displays on the reference image(s).
4. When scanning with an elliptical ROI, press <Set> to fix the ROI position and freeze
its corresponding trace on the plot.
The average intensity value inside the ellipse is calculated for every image in the image
analysis range and plotted in the image display area.
The last generated or selected ellipse is considered to be the active ROI, and its trace
plot automatically updates as the user repositions it on the reference image.
A new active ROI is generated whose position is manipulated by the trackball and whose
analysis curve traces will be plotted as before, while the previous ROI and trace remain
fixed at the points they were saved at.
Press <Clear> to delete last ROI.
Ellipse ROI
1. Tap [Ellipse ROI] on the touch screen. When the cursor appears in the image review
area (TVI image review window or 2D image review window), it displays as a color-
coded ellipse.
2. Browse the image to a desired frame.
3. Use the trackball to position the caliper on the reference image at the start point.
Press <Set> to fix the start point.
4. Trace the outline of the desired ROI by moving the cursor with the trackball.
5. Press the <Set> key, and roll the trackball to create the ROI. When a suitable ROI
has been drawn, confirm the ROI by double-clicking the <Set> key. Press the
<Clear> key to cancel the drawing.
5-34 Image Optimization
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