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Mean volume flow estimation in pulsatile flow conditions.

Michael S Richards1, Oliver D Kripfgans, Jonathan M Rubin

  • 1Department of Radiology, University of Michigan, Ann Arbor, MI 48109-5667, USA.

Ultrasound in Medicine & Biology
|October 13, 2009
PubMed
Summary
This summary is machine-generated.

This study validates a 3D ultrasound method for measuring blood flow, showing it accurately calculates time-average volume flow without cardiac gating. The technique is independent of Doppler angle, flow profile, and vessel geometry, proving reliable in canine studies.

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Area of Science:

  • Medical Imaging
  • Ultrasound Technology
  • Cardiovascular Physiology

Background:

  • Accurate measurement of volumetric blood flow is crucial for diagnosing and managing cardiovascular diseases.
  • Existing methods for blood flow measurement often involve invasive procedures or have limitations such as dependence on Doppler angle and flow profiles.

Purpose of the Study:

  • To verify a previously reported three-dimensional (3D) ultrasound method for measuring time-average volumetric blood flow under pulsatile conditions.
  • To compare the accuracy of the 3D ultrasound method against invasive "gold standard" techniques in vivo.

Main Methods:

  • Utilized a GE Logiq 9 ultrasound system with 4D probes to acquire 3D Doppler measurements in canine femoral and carotid arteries.
  • Employed invasive electromagnetic and ultrasonic flow meters as gold standards for comparison.
  • Integrated color flow pixels across vessel cross-sections and used Power Doppler data to correct for partial volume effects.

Main Results:

  • The 3D ultrasound method accurately measured time-average volume flow without cardiac gating, demonstrating independence from Doppler angle, flow profile, and vessel geometry.
  • Flow rate estimates showed strong correlation with gold standard measurements (r(2) = 0.95), with a small flow offset of 0.6% and linearity error of 7.4%.
  • Percent-error distribution followed a Gaussian function (mu=-7.04%, sigma=9.52%), and experimental error dependence on sample size (N) matched theoretical predictions (1/N).

Conclusions:

  • The validated 3D ultrasound method provides accurate and reliable in vivo measurement of pulsatile volumetric blood flow.
  • This non-invasive technique offers significant advantages over existing methods due to its independence from various flow and geometric parameters.
  • The findings support the clinical utility of 3D ultrasound for comprehensive cardiovascular blood flow assessment.