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.
Plot of the SNR variations for sample phantoms with attenuation coefficient of 0.5 dB/cm/MHz, and sample sound speed of (a) 1540, (b) 1500, (c) 1580 m/s, respectively. The backscatter intensity from −3 to 3 dB with respect to the backscatter level of the reference phantom. In all cases, the reference phantom has a 0.5 dB/cm/MHz attenuation coefficient, a 25 μm scatterer diameter, 1540 m/s sound speed, and scatterer density of 20 scatterers/mm3. The frequency range is 2–9 MHz.
