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.
Attenuation slope estimates for TM phantoms with a SOS of 1540 m/s, with sample attenuation coefficients of (a) 0.5, (b) 0.3, (c) 0.7 (dB/cm)/MHz. In all cases the reference phantom had a 0.5 (dB/cm)/MHz attenuation coefficient, 50 μm scatterer diameter, and 1540 m/s sound speed at 0 dB scatterer intensity. The frequency range is 2–9 MHz. The range of backscatter intensity varies from −3 to 3 dB with respect to the backscatter level of the reference phantom.
