An arterial wall motion test phantom for the evaluation of wall motion software

Area of Science:

• Biomedical Engineering
• Medical Imaging
• Cardiovascular Research

Background:

• Cardiovascular disease is a growing concern, necessitating advanced diagnostic tools.
• Ultrasound methods, like arterial wall motion measurement, are emerging for artery disease assessment.
• Validation of these new software tools is crucial for clinical reliability.

Purpose of the Study:

• To develop and validate a mechanically controlled test phantom for arterial wall motion.
• To assess the accuracy of ultrasound-based arterial wall motion measurement software.
• To evaluate the performance of tissue Doppler imaging (TDI) for distension waveform estimation.

Main Methods:

• Developed a phantom with agar tissue mimicking layers simulating artery cross-sections.
• Utilized custom software and a stepper motor controller for precise wall motion simulation.
• Employed a laser vibrometer for positional accuracy assessment (36+/-2 microm).
• Assessed a tissue Doppler imaging (TDI) method using the phantom under physiological conditions.

Main Results:

• The test phantom achieved a positional accuracy of 36+/-2 micrometers.
• The TDI method demonstrated a minimum resolvable displacement of 22.5 micrometers.
• TDI measurement accuracy was +/-8% for a peak displacement of 689 micrometers.
• TDI accuracy decreased with lower wall displacement and higher wall velocity.

Conclusions:

• The developed mechanical phantom is a reliable tool for validating arterial wall motion software.
• The phantom enables accurate assessment of ultrasound-based diagnostic methods like TDI.
• Findings highlight TDI's limitations at low displacements and high velocities, guiding future improvements.