Mindray DC-80A, Operator'S Manual

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5-32 Image Optimization
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The X-axis represents the time (unit: s).
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Frame marker: a white line perpendicular to the X-axis which can be moved horizontally left to
right (and right to left) by rolling the trackball.
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Click the checkbox beside the ROI to set whether to hide or display the QA curve.
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You can get the current X/Y-axis value by moving the cursor onto one point on the curve. If you
press <Set> now, the frame marker will move to that spot.
4 - Displays the ECG trace (no ECG trace displayed here).
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”.
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Ellipse ROI: if selected, the ROI is drawn by the trackball.
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Standard ROI
1. Touch [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.
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Ellipse ROI
1. Touch [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.