Fig. 1.
Schematic used to illustrate the eight neighboring electrodes that are used to calculate the finite-difference surface Laplacian. The source activity is within a measurement area centered at electrode P0.
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.