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#### Types of Window/Level values

There are four types of Window/Level values in Disc:

| • | Source Window/Level

| • | Estimate Window/Level

| • | Default Window/Level

| • | Window/Level presets

To apply one of these Window/Level values, use the Window/Level panel, the main toolbar, or the right-click menu. See Applying Window/Level values.

Source Window/Level

A Source Window/Level contains the Window/Level values and/or Look-Up Table (LUT) functions provided by the image device. The values are stored in the DICOM header. Up to six Source Window/Level values and LUT functions can be stored.

| • | If there is one Source Window/Level or LUT function, Source is listed.

| • | If there are multiple Source Window/Level values and/or LUT functions, Source 1, Source 2, and so on are listed. An asterisk (*) appended to the number indicates that the Source Window/Level is specific for the modality, image device, and/or image type.

Estimate Window/Level

The Estimate Window/Level contains the Window/Level values estimated based on histogram analysis of the image. For details on the histogram, see Displaying and hiding the histogram and LUT function graph.

Use the Estimate Window/Level when the values provided by the image device do not produce an optimal image presentation. It is listed as Estimate.

Note: Window/Level values can also be estimated for and applied to a small, magnified area of an image. See Magnifying a region of interest (ROI).

Default Window/Level

The Default Window/Level contains the Window/Level values determined by the system. It is perceived as the best available Window/Level for the images.

The Default Window/Level is determined by the following factors:

If... | Then...
Saved study presentation for the study exist | The Window/Level in the most recently saved presentation is the Default Window/Level. It is listed as Default (Saved). See also About study presentations.
There are more than one Window/Level in the DICOM header | The Source Window/Level specific for the modality, image device, and/or image type is the Default Window/Level. It is listed as Default (Source n*), where n is the Source Window/Level number.
There is only one Window/Level in the DICOM header | The Source Window/Level is the Default Window/Level. It is listed as Default (Source).
There are no saved presentations or Window/Level values in the DICOM header | The Estimate Window/Level is the Default Window/Level. It is listed as Default (Estimate).

Note: The Default Window/Level is not listed in the Window/Level panel.

Window/Level presets

A predefined Window/Level preset contains predefined Window/Level values and LUT function for a specific modality/intensity unit combination. Window/Level presets can be shipped with Disc, configured for the site, or defined by users.

Window/Level presets are used to quickly apply the optimal image presentation settings for a particular modality and body region. For example, you can save a Window/Level preset that contains optimal settings for the CT modality and the Head body region.

Window/Level presets are listed alphabetically by their name. In addition, for presets whose applied LUT function is not Linear, the LUT function type is appended to the name. For example:

| • | The CT Head preset pertains to the Linear LUT function

| • | The CT Soft Tissue - Gamma preset pertains to the Gamma LUT function

For details on the different LUT functions, see Types of LUT functions.

To add, modify, and deleted Window/Level presets, see Applying post processing.

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