Figure 6.
When projections from bottom layers are back projected to the first layer, the apparent shift will appear to be less than a half pixel due beam divergence. It is necessary to interpolate the back projected image onto its original grid.
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.