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#### About non-linear LUT functions

Non-linear LUT functions are applied in addition to Window/Level values. They enable you to optimize the image presentation, by applying a correction factor during image processing.

Reasons for applying a non-linear function

Image quality can be affected by the following factors:

| • | Physical limits of the image device

| • | Image device configuration

| • | Acquisition protocol, which defines the relevant anatomical portions a Technologist captures images for a particular procedure type

| • | Default settings, such as over-exposure or under-exposure

| • | Patient’s movement

Because of these factors, linear Window/Level processing does not always display the optimal image quality.

Supported non-linear LUT functions

The Disc Advanced Viewer supports the following non-linear LUT functions:

| • | Gamma function

| • | Hurter and Driffield (H&D) function

| • | Sigmoid function

See Gamma, Hurter and Driffield (H&D), and Sigmoid functions.

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