A thin film phantom for blood flow simulation and Doppler test

Area of Science:

• Ultrasound imaging
• Medical device technology
• Biomedical engineering

Background:

• Ultrasound resolution test objects are crucial for calibrating imaging systems.
• Existing phantoms often lack the ability to simulate complex flow dynamics.
• A need exists for advanced phantoms capable of mimicking realistic physiological conditions.

Purpose of the Study:

• To develop and characterize a novel thin film phantom for ultrasound resolution testing.
• To demonstrate the phantom's capability in simulating various blood flow patterns.
• To validate the phantom's utility in creating reproducible and controllable scattering characteristics.

Main Methods:

• Fabrication of a thin planar substrate with precisely located, patterned scatterers.
• Acoustic matching of the substrate to surrounding media for signal fidelity.
• Application of controlled substrate vibrations (sinusoidal and noise signals) to simulate flow.
• Analysis of generated Doppler spectral signals and simulated velocity distributions.

Main Results:

• The thin film phantom exhibits reproducible and controllable scattering properties.
• Substrate vibration successfully simulates bi-directional flow (Doppler signals at f0 and -f0).
• Bandlimited noise driving simulates velocity distributions and time-varying flow.
• Demonstration of a system simulating arterial flow with simultaneous forward and reverse velocity components.

Conclusions:

• The thin film phantom is a versatile ultrasound test object.
• It effectively simulates complex hemodynamic conditions, including arterial flow patterns.
• This technology offers a new standard for ultrasound system performance evaluation and development.