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A complex flow phantom for medical imaging: ring vortex phantom design and technical specification.

Simone Ambrogio1,2,3, Adrian Walker3, Andrew Narracott1,2

  • 1a Department of Infection, Immunity and Cardiovascular Disease, Medical Physics, Mathematical Modelling in Medicine Group, University of Sheffield , Sheffield , UK.

Journal of Medical Engineering & Technology
|July 16, 2019
PubMed
Summary
This summary is machine-generated.

A new, affordable, portable flow phantom creates controllable vortex rings, mimicking complex cardiovascular flows for improved diagnostic technology quality assurance. This enables better early disease prediction.

Keywords:
Doppler ultrasound quality assuranceMedical imaging phantomcomplex flow phantomlaser PIVvortex ring

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Area of Science:

  • Biomedical Engineering
  • Fluid Dynamics
  • Medical Imaging Technology

Background:

  • Cardiovascular fluid dynamics involve complex patterns like vortices, crucial for diagnosing pathologies.
  • Assuring the quality of imaging technologies for these flows is vital but challenging.

Purpose of the Study:

  • To propose and specify the design of a novel, cost-effective, portable complex flow phantom.
  • To utilize vortex rings as a model for physiological flows due to their stability and controllability.

Main Methods:

  • A motor-driven piston/cylinder system generates vortex rings within a fluid-filled tank.
  • Varying piston speed, displacement, and orifice size allows control over vortex ring characteristics.
  • Laser-PIV and optical/video techniques were employed for phantom testing.

Main Results:

  • The phantom successfully produced vortex rings with velocities from 1-80 cm/s and orifice diameters of 10-25 mm.
  • Reproducibility of generated vortex rings was consistently better than ±10%.
  • Ultrasound compatibility was demonstrated.

Conclusions:

  • The developed flow phantom is a valuable, cost-effective tool for quality assurance in cardiovascular flow imaging.
  • Its design allows for reproducible generation of complex flow patterns relevant to physiological conditions.
  • Future work includes adapting the phantom for comparative studies across different imaging modalities.