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#### Steps for applying a non-linear LUT function

For an overview of non-linear LUT functions, see About non-linear LUT functions.

Steps for this task

To apply a non-linear LUT function:

| 1. | Click the image to which you want to apply the non-linear LUT function.

| 2. | Click the W/L icon on the main toolbar.

The panel is displayed.

For other ways to display the Window/Level panel, see step 1 of Specifying the Window/Level scope.

| 3. | Click the Type box, and then select the type of non-linear LUT function you want to apply. For details on the non-linear LUT functions, see Gamma, Hurter and Driffield (H&D), and Sigmoid functions.

The corresponding coefficients are displayed at the bottom of the Window/Level panel.

| 4. | Specify the coefficients associated with the selected non-linear LUT function, by dragging the slider.

To... | Do this...
Apply the Gamma function |
| • | Specify the Gamma coefficient to modify the display values, until the optimal image presentation is obtained.
Apply the H&D function |
| • | Specify the Toe coefficient and Shoulder coefficient to modify the display values for different procedure types or body regions, until the optimal image presentation is obtained.
Apply the Sigmoid function |
| • | Specify the curvature of the Sigmoid function to modify the display values for different procedure types or body regions, until the optimal image presentation is obtained.

The non-linear LUT function is applied within the Window/Level scope of your choice. You can also select another scope. See Specifying the Window/Level scope.

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