How to Measure Distances
To measure the distance within a slice, select two target points in the slice. The distance between them as well as the point information of the end point is displayed.
To measure the distance between two points on different slices:
This can also be done across different image views.
To move a line, hover over it with the mouse pointer and drag it to its new position with the left mouse button.
To remove all lines, select Distance under Measure to deselect the function.