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Using basic tools
In the middle of the toolbar there are five buttons.
They represent basic tools which are available in RadiAnt DICOM Viewer:
The default ROI tool is length measurement. The ROI tool can be changed by clicking the arrow on the right side of the button and choosing specific tool from the drop-down menu.
Each tool can be assigned to one of three mouse buttons. Just click the tool button with the left, middle or right mouse button. The current assignment is represented by a mouse icon with one (or more) buttons highlighted: left , middle or right .
By default the left mouse button is assigned to the "Browse" tool. The middle button controls brightness and contrast (window level / width), and the right mouse button is used for zooming in or out.