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.
Subjective image quality. The figure demonstrates typical images for each grade (1–4) regarding the right coronary artery (RCA).
A. Excellent image quality (grade 4). B. Good image quality (grade 3) with slight blurring artifacts (*). C. Moderate image quality (grade 2) due to beam hardening artefacts of pacemaker leads (arrows). D. Severe blurring artifacts (arrowhead) cause non diagnostic image quality (grade 1) of the mid portion of the vessel.
