Measuring tools
Click the Measure tab in the tools bar to go to the following tools:
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Measure the HU value of a point.
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Measure a linear distance. | ||
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Measure segments. | ||
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Measure an angle. |
The measurements are shown on the Annotation tab 
of the smart panel.
To move an annotation, click and drag the annotation on the viewer.
Furthermore, you can change the color of an annotation or delete the annotation.