> ## Documentation Index
> Fetch the complete documentation index at: https://docs.navnx.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Stack View

> Navigating DICOM slices in stack view with scroll, window/level, and slice indicator.

## Stack View

Stack view displays a single DICOM slice at a time, allowing you to scroll through the imaging series sequentially. This is the default view when you first load DICOM data.

## Scrolling Through Slices

Use the **mouse scroll wheel** to move through slices:

* **Scroll up** — move towards the head (superior)
* **Scroll down** — move towards the feet (inferior)

The slice indicator in the status bar shows your current position (e.g., `Slice 128 / 256`).

<Tip>
  Hold **Shift** while scrolling to jump 10 slices at a time. This is useful for quickly navigating through large CT series with hundreds of slices.
</Tip>

## Window / Level

Window and level controls adjust the brightness and contrast of the displayed image, which is essential for differentiating between tissue types.

To adjust window/level:

1. **Right-click and drag** on the viewport.
2. Drag **horizontally** to adjust the window (contrast).
3. Drag **vertically** to adjust the level (brightness).

Common presets are available in the toolbar dropdown:

| Preset      | Window | Level | Use                                |
| ----------- | ------ | ----- | ---------------------------------- |
| Bone        | 2000   | 500   | Cortical and cancellous bone       |
| Soft Tissue | 400    | 50    | Muscles, tendons, ligaments        |
| Lung        | 1500   | -500  | Not typically used in orthopaedics |

## Slice Indicator

The slice indicator at the bottom of the viewport displays:

* Current slice number and total slice count
* Slice thickness (mm)
* Series description from the DICOM metadata

## Zoom and Pan

* **Scroll wheel click + drag** — pan the image
* **Ctrl + scroll wheel** — zoom in and out

<Note>
  All measurement annotations and planning data are visible in stack view. Annotations are tied to specific slices and appear as you scroll to the relevant position.
</Note>