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Related Experiment Videos

A rotating torus phantom for assessing color Doppler accuracy.

S F Stewart1

  • 1Hydrodynamics and Acoustics Branch, Center for Devices and Radiological Health, Food and Drug Administration, Rockville, MD 20850, USA. sxs@cdrh.fda.gov

Ultrasound in Medicine & Biology
|November 27, 1999
PubMed
Summary

A novel rotating torus phantom accurately assesses color Doppler ultrasound velocity measurements. This tool offers advantages over existing phantoms for calibrating 2-D color Doppler systems.

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Effects of transducer, velocity, Doppler angle, and instrument settings on the accuracy of color Doppler ultrasound.

Ultrasound in medicine & biology·2001

Area of Science:

  • Medical Imaging
  • Ultrasound Technology
  • Fluid Dynamics

Background:

  • Accurate velocity measurement is crucial for color Doppler ultrasound.
  • Existing phantoms for Doppler accuracy assessment have limitations.

Purpose of the Study:

  • To design and validate a rotating torus phantom for assessing color Doppler ultrasound accuracy.
  • To evaluate the performance of a commercial ultrasound system using the developed phantom.

Main Methods:

  • A torus phantom was constructed using a blood analog fluid in a rubber tube, rotated by a motor.
  • Fluid dynamics were analyzed using flow visualization and finite element analysis.
  • Doppler-derived velocities were measured using a 2-D color imaging system and compared to known velocities.

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Main Results:

  • Fluid within the torus exhibited solid-body rotation, with velocity dependent on motor speed and sample volume location.
  • Doppler-derived velocities averaged 0.81 ± 0.11 of the actual velocity.
  • Velocity measurement accuracy was significantly influenced by velocity, pulse-repetition frequency, and wall filter settings (p < 0.001).

Conclusions:

  • The rotating torus phantom provides a reliable method for assessing color Doppler ultrasound accuracy.
  • The phantom offers advantages including high maximum velocity, low velocity gradients, and realistic backscatter.
  • This phantom aids in simplifying the calibration of 2-D color Doppler systems.