Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
A The normal distance describes the shortest possible distance between a point and a straight line. The ED determines the gap between two points in a multidimensional space. It is calculated using the coordinates of the actual position of the needle tip and the target point (dashed arrow), indicating the deviation in the direction of the needle placement. B Box plot of the StealthStation S7 displaying the targeting accuracy on the basis of the ND at all slice thicknesses
