Volumetric blood flow via time-domain correlation: experimental verification

Area of Science:

• Biomedical Engineering
• Fluid Dynamics
• Ultrasound Technology

Background:

• Accurate volumetric flow measurement is crucial for various applications.
• Existing ultrasonic flow measurement methods have limitations.

Purpose of the Study:

• To develop and validate a novel ultrasonic method for volumetric flow measurement.
• To assess the accuracy and feasibility of the time-domain correlation technique.

Main Methods:

• Developed a novel ultrasonic method using time-domain correlation of consecutive echo pairs.
• Employed an ultrasonic data acquisition system to determine time shifts via maximum correlation of RF sampled waveforms.
• Utilized Sephadex particles in water and porcine blood as ultrasound scattering fluids in a 5-MHz transducer system.

Main Results:

• Achieved a standard deviation of less than 10% for steady fluid velocity estimates in 6-mm tubes.
• Estimated two-dimensional (2-D) flow velocity by sweeping the ultrasonic beam.
• Obtained volumetric flow rates from 50-500 ml/min with better than 10% accuracy under idealized conditions.

Conclusions:

• The novel ultrasonic time-domain correlation method provides accurate volumetric flow measurements.
• The technique shows promise for flow assessment in applications with idealized conditions.
• Further research is needed to evaluate performance in more complex scenarios.