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.
Inverse of measured variance in air region outside objects scanned with tube-current modulation enabled. Line represents scaled tube current, open markers are the simulated and solid markers are real scans. (a) Skull scan with tube modulation on for 250 mAs (lower) and both simulated and original 50 mAs (upper), (b) a patient body scan.
