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Model studies of nonsteady flow using magnetic resonance imaging
D Y Fei1, K A Kraft, P P Fatouros
1Biomedical Engineering Program, Medical College of Virginia, Virginia Commonwealth University, Richmond VA 23298.
Journal of Biomechanical Engineering
|February 1, 1990
Summary
Magnetic resonance imaging (MRI) accurately measured blood flow velocity in tube models, matching theoretical predictions and ultrasonic flowmeter data. This noninvasive technique shows promise for in vivo vascular hemodynamics research.
Area of Science:
- Biomedical Engineering
- Medical Imaging
- Fluid Dynamics
Background:
- Accurate measurement of blood flow velocity is crucial for understanding vascular hemodynamics.
- Traditional methods for measuring flow can be invasive or limited in scope.
- Developing noninvasive techniques for detailed flow analysis is an ongoing challenge.
Purpose of the Study:
- To evaluate a bolus-tracking magnetic resonance imaging (MRI) method for measuring velocity profiles.
- To assess the accuracy of MRI-derived flow rates against an established method.
- To explore the potential of MRI for in vivo hemodynamic studies.
Main Methods:
- Utilized bolus-tracking magnetic resonance imaging (MRI) in an axisymmetric tube model.
- Measured velocity profiles for oscillatory, pulsatile, and combined flow conditions.
- Compared instantaneous flow rates derived from MRI with those from an ultrasonic flowmeter.
Main Results:
- Imaged velocity profiles generally aligned with theoretical predictions.
- Instantaneous flow rates from MRI showed good agreement with ultrasonic flowmeter measurements.
- The technique was tested across a range of physiological flow conditions.
Conclusions:
- Bolus-tracking MRI is a viable method for measuring complex blood flow velocity profiles.
- The noninvasive nature and accuracy of MRI make it suitable for in vivo vascular hemodynamics research.
- This technique offers a promising tool for clinical and research applications in cardiovascular health.