Window/Level is a similar concept to "brightness and contrast".
Manually Adjusting the Window
There are a number of ways to adjust the window & level of an image:
|1.||Select the Window/Level Tool, and drag around on the image with the right mouse button. Dragging up increases the "level" (or window centre), while dragging down decreases it; dragging left reduces the window width and dragging right enlarges it. Combining both dragging motions will adjust both the window width and level simultaneously.|
Dragging up moves the window of selected values to the higher end of the image's dynamic range.
Dragging left reduces the window size, selecting a smaller portion of the image's dynamic range and saturating everything outside of it.
|2.||Drag around on the image using the middle mouse button. For convenience, this method is available anytime regardless of the selected tool.|
Some images may come with predefined windows and/or non-linear transforms (typically called "data LUTs") embedded in either the image's own headers or in an associated presentation state (such as those generated in the process of creating a key image). There are a couple of ways to cycle through all the available presets:
|1.||Press the F2 key repeatedly (note the changing description in the lower left corner of the text overlay as you cycle through the available windows/LUTs).|
|2.||Select Auto from the drop-down beside the Window/Level button.|
In the case where there are multiple LUTs, both linear and data, the "Auto" algorithm cycles first through the data LUTs, then through the linear ones.
Applying User-Defined Presets
In addition to applying preset windows/LUTs included with the study, you can also define modality-specific presets that can be bound to a specific key stroke through the preferences dialog. There are a couple of ways in which you can apply these custom presets:
|1.||Press the key to which the preset is bound, if one exists.|
|2.||Select the desired preset from the drop-down beside the Window/Level button.|
|3.||Select the desired preset from the context menu, under Window/Level Presets. The previously mentioned "Auto" preset is available here as well.|
ClearCanvas Workstation, Personal - User's Guide
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