2.13. Set Window Level and Width

To change the parameters, move the mouse in the study window, holding the right mouse button

to increase the window level — up;
to reduce the window level — down;
to reduce the window width — left;
to increase the window width — right.

The terms "window width" and "window level" in digital images commonly refer to "contrast" and "brightness" respectively on your computer.

The current window level and width values are displayed in the top right-hand corner of the window. If the Adjust W/L tool on the toolbar is active, these changes are made holding the left mouse button. You may as well activate this mode from the image context menu.

The contains predefined width and level values for some specific tissues. To select them, click on the left side of the Custom W/L button. The following modes will be available in the newly opened window:

recommended (automatically defined by the DICOM Viewer as optimum)
to view chest tissues;
to view lung tissues;
to view headneck tissues;
to view brain tissues;
to view bone tissues;
to view abdomen tissues;
custom mode. The values defined by the user can be edited.

You cannot edit the values predefined for specific tissues.

To select one of the modes without the preview option, click on the arrow on the right side of the button. To return to the original settings, select the Recommended mode.

This tool is also available from the Image main menu item.