1. Volume 108, Issue 2, Pages 515-521 (August 1995)
Determination of Vascular Impedance in the Peripheral Circulation by Transcutaneous Pulsed Doppler Ultrasound 
Steven Solomon, PhD, Stuart D. Katz, MD, William Stevenson-Smith, MD, Edward L. Yellin, PhD, Thierry H. Lejemtel, MD 
CHEST 
Volume 108, Issue 2, Pages (August 1995)
DOI: /chest
Copyright © 1995 The American College of Chest Physicians Terms and Conditions

2. FIGURE 1
Representative example of blood flow velocity waveforms obtained noninvasively by Doppler ultrasound (open diamonds) and invasively by electromagnetic flow probe (asterisks) in the time domain.
CHEST  , DOI: ( /chest )
Copyright © 1995 The American College of Chest Physicians Terms and Conditions

3. FIGURE 2
Frequency spectra corresponding to blood flow velocity waveforms obtained noninvasively by Doppler ultrasound (open diamonds) and invasively by electromagnetic flow probe (asterisks).
CHEST  , DOI: ( /chest )
Copyright © 1995 The American College of Chest Physicians Terms and Conditions

4. FIGURE 3
Mean values for baseline impedance moduli of a frequency spectra derived from noninvasively determined Doppler blood flow velocity and invasively determined electromagnetic blood flow velocity and simultaneous high-fidelity recording of common femoral artery pressure.
CHEST  , DOI: ( /chest )
Copyright © 1995 The American College of Chest Physicians Terms and Conditions

5. FIGURE 4
Mean values for baseline impedance moduli of a frequency spectra derived from noninvasively determined Doppler blood flow velocity and invasively determined electromagnetic blood flow velocity and simultaneous high-fidelity recording of common femoral artery pressure after intra-arterial administration of acetylcholine.
CHEST  , DOI: ( /chest )
Copyright © 1995 The American College of Chest Physicians Terms and Conditions

6. FIGURE 5
A representative vascular impedance spectrum derived from noninvasive measurements of blood flow velocity by Doppler ultrasonography and high-fidelity pressure recording in the superficial femoral artery of three normal subjects prior to (solid circles) and after (open circles) intra-arterial administration of acetylcholine.
CHEST  , DOI: ( /chest )
Copyright © 1995 The American College of Chest Physicians Terms and Conditions