RadiologyInfo: Vascular Ultrasound
- Explains what patients might experience, how to prepare for exams, and benefits vs. risks.
- http://www.radiologyinfo.org/en/info.cfm?pg=vascularus

Doppler Ultrasound
- The Doppler effect is a change in the frequency of a wave, resulting from motion of the wave source or receiver, or in the case of a reflected wave, motion of the reflector. In medicine, Doppler US is used to detect and me
- http://ej.rsna.org/ej3/0079-98.fin/doppler.htm

Measuring blood flow acutely with ultrasonic flowmeters
- paper
- http://www.physiology.com/agar.html