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.
Representative Doppler images of blood flow of a female patient with recurrent headache. (a) Before LLLT; (b) immediately after LLLT; (c) 1 min after LLLT; and (d) 2 min after LLLT. PS: peak systolic velocity; ED: end diastolic velocity; S/D: PS/ED; RI: resistive index (PS-ED/PS). (A color version of this figure is available in the online journal.)
