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) Calculation of the included angle 
, and declaration of the point 
to be a concave point if the angle was less than 90°. (b) Angle 
computation examples for the concave point declaration based on the results of Fig. 2(f). (c) Detected concave points with red dots on 
. (d) Detected concave points on the juxta-pleural nodule candidate contours, and (e) the remaining nodule candidates that included any concave point.
