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.
Exposure normalized pre-breast measured spectra with various filters superimposed with simulated spectra. Spectra are acquired at 60 kVp and 200th VL. The weighted mean beam energy for each filter is illustrated with a vertical dashed line.
