See also:

• Business: Healthcare: Products and Services: Diagnostic: Ultrasound  (100)
• Health: Conditions and Diseases: Cardiovascular Disorders: Vascular Disorders  (267)
• Health: Medicine: Surgery: Vascular  (24)

• 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 measure blood flow, and the major reflector is the red blood cell.
• Measuring blood flow acutely with ultrasonic flowmeters - paper
• RadiologyInfo: Vascular Ultrasound - Explains what patients might experience, how to prepare for exams, and benefits vs. risks.
• Transcranial Doppler Ultrasound - Information about the a safe, reliable, and relatively inexpensive technology for measuring cerebrovascular blood velocities by Medical College of Georgia.