An official website of the United States government
Here's how you know
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.
Scatter plot of intraobserver/intravisit rim area difference (mm2) against mean image quality (MPHSD) using HRT Explorer. The regression line is also shown (R2 = 0.4, p<0.0001).