An official website of the United States government
Here's how you know
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.
Histogram of the SCR calculated from the color Doppler data for stone twinkling power (blue) and maximum renal blood flow (pink). The median Doppler power for stone is 3.5 times (or 5.5 dB) greater than the signal from blood flow (p = 0.088). Post hoc power analysis is 40%.