Measurements are used to measure specific areas or angles on an image.
1. Click on the measurements icon from the toolbox panel, in the bottom left corner of the screen: 
2. A pop-up window will appear with a few different measurement options to choose from, a basic description of each one is given below:
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Ruler
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Click & drag the mouse to draw a line.
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Polyruler
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Click & drag mouse to draw the first line, and then click every time the for a new line, right click to end the line.
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Protractor
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Click & drag mouse to draw the first line, then click to produce the second line for the angle
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Rectangle Area
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Click & drag the mouse from the corner of the rectangle to draw a rectangle
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Ellipse Area
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Click & drag the mouse to draw an ellipse.
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Freehand Area
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Hold in mouse click and draw freehand region of interest
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Cobb Angle
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Click & drag mouse to create line parallel to superior end of vertebrae, and then repeat for inferior end of vertebra.
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4 Point Angle
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Click & drag mouse to create the first line, then let go of mouse click and repeat to create second line. The angle between the lines will show.
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Cross Product
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Hold in mouse click on start of cross product, drag the mouse to expand
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Vertebral Heart Scale
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Click & drag the mouse to cover the area of the heart. Indicators for T4-T12 will appear; drag them to the correct position.
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3. Select one of the options and then draw the measurement on an image from the image window.
Examples of the different measurements available:
