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 Voluntary axial rotation of the body in the dual fluoroscopic image system (DFIS); b the virtual DFIS created to reproduce the in vivo vertebral motion and vertebral coordinate system. x medial–lateral translation, flexion/extension rotation; y anterior–posterior translation, left/right lateral bending; z superior–inferior translation, left/right axial rotation
