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.
Ultrasound images to observe changes in the margin of the thyroid nodule: (a) noisy image and (b) NLM denoising with high smoothing. The red arrow means the actual exact nodule margin, and the yellow arrow means the margin that can be misunderstood.
