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.
Noise measurements of a water phantom for imaging protocols used in this study (pitch 1.0 for GE and 0.98 for Siemens were almost the same). H, M, and L on x-axis correspond to eff. mAs of 250, 100, and 50, respectively. The diameter of the water phantom is 21.6 cm and a region of interest of 400 mm2 was used for standard deviation evaluation. The dashed line corresponds to 18 HU.
