# Anatomical Fiducials

Note

To navigate through the 2D view:
Move crosshairs in all views: hold Shift while moving the mouse
Zoom in/out: hold the right mouse button while moving mouse up/down (can hold Control/Command and scroll)
Pan (translate) scan: hold middle-mouse button while moving the mouse

## Placing Fiducials¶

The midline plane will need to be determined, which relies on four points: the anterior commissure (AC), the posterior commissure (PC), and two midline points (Mid 1-2). The midline points should be at least one interhemispheric point and one brainstem point (see section below for landmark positions). These 4 points are then used to define the midline plane, which is used to define the Talaraich coordinate system.

To place a fiducial point, click on the place point button () and drop the point at the indicated landmark. Once you have placed AC, PC and at least 2 midlines, click Confirm Fiducials. A new entry will be added to the fiducial table for the point MCP.

Warning

If you modify any fiducial points you will need to press Confirm Fiducials again to re-calculate MCP