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.
Calibrated AC (top) and BSC (bottom) versus frequency for the five UIC reference phantoms along with each calibration curve (denoted by GUI). The calibration data were acquired between February 2017 and July 2018 and bracketed the dates of the R&R phantom study that was conducted with the five phantoms and three sonographers during April and May 2018.
