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.
Demonstration of EPI-artifacts: top left: conventional (undistorted) gradient-echo image; top right: raw EPI-image (note distortion of image and “ghosting” in front and back); bottom left: distorted image after correction of Nyquist-ghosts; bottom right: final, geometry- and ghost-corrected EPI-image.
