Window / Level Tool

Window / Level Tool

The Window / Level Tool is used to change the Window and Level settings for the current image.

To change the Window and/or Level for the Image, left-click with the mouse anywhere on the image and then drag the mouse [with the left-button down] as follows to change these values:

Up	Decrease Level
Down	Increase Level
Left	Decrease Window
Right	Increase Window

Once you start changing the Window and/or Level, you can move the cursor anywhere on the screen (even outside the image area), and as long as you keep the left button down, the Window and Level will continue to change. If you have enabled Image Tool Tips, a yellow box will track with the mouse showing the current Window and Level settings as you change them. In addition, the status bar at the bottom of the RadPix Main Window also shows the current Window and Level, as well as the delta values between the current settings and the settings before you started to change the settings.

Right Click on the image or on the Window/Level Tool icon, and the Window/Level Popup Menu will appear - see below.
When the Window / Level Tool is active, the Cursor looks like this:

Window / Level Tool Popup Menu

When you right-click on the image or the Window/Level Tool Button, the following Menu appears:

**Menu Options**
Change All W/L	Change the Window and Level for all loaded images to the Window and Level of the current Image.
Reset this W/L	Reset the Window and Level of the current Image to the values in the Image Header.
Reset All W/L	Reset the Window and Level for all loaded images to the values in their respective Image Headers.
Compute W/L from Distribution	This will compute a Window and Level for the current Image based on statistical calculations of the raw pixel data. The Level is computed from the mean of the pixel data. Depending on the setting of Default Window Computation option, the Window is either the maximum pixel value minus the minimum pixel value, or equal to 3 times the standard deviation of the data.
Same W/L All Images	Selecting this item sets an option that will cause all of the Window and Level values for the loaded images to be set to the values for the current Image. In addition, when you change the Window and Level for any image, the Window and Level for all loaded images will change as well.
W/L Tool Settings	This brings up the Window / Level Tool Settings dialog (below)

If the current image is identified as a CT image, the following preset Window and Level settings are also available.

Window / Level Tool Settings

Dialog Fields

*Current Window*	This is the current Window value for the current Image.
Current Level	This is the current Level value for the current Image.
Original Window	This is the Window value for the current Image taken from the Image header.
Original Level	This is the Level value for the current Image taken from the Image header.
Default Window	This is the Default Window value used if there is no Window value in the Image header.
Default Level	This is the Default Level value used if there is no Level value in the Image header.
Window Max	This is the maximum value that the Window can be adjusted to.
Level Max	This is the maximum value that the Level can be adjusted to.
Reset Current	Reset the Window & Level for the current image to the values in the Image header.
Reset All	Reset the Window & Level for all currently loaded Images to the values contained in their respective Image headers.
Change All	Change the Window & Level of all loaded images to the values for the current Image.
Same W/L All Images	Change the Window & Level values of all loaded Images to the values for the current Image. In addition, when you change the Window and Level for any image, the Window and Level for all loaded images will change as well.
Mouse Acceleration	Adjusts the amount that the Window & Level change based on how far the mouse moves. For a value of 2, this means that the value will change by 1 for every 2 pixels that the mouse moves.

When an Image is closed, and the Window and/or Level has changed from the value saved in the Image header, the following dialog will appear. Note that you can only save the Window and Level if Image Compression is enabled.

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Help Topics	info@radpix.com	Last Updated 12-6-04