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An ultrasonic method for detection of fluid properties in the paranasal sinuses

Författare:
Publiceringsår: 2005
Språk: Engelska
Sidor: 115-116
Publikation/Tidskrift/Serie: Proceedings of the International Federation for Medical & Biomedical Engineering. 13th Nordic Baltic Conference on Biomedical Engineering and Medical Physics
Dokumenttyp: Konferensbidrag
Förlag: Int. Federation for Medical and Biological Eng

Sammanfattning

We propose a method for detection of the degree of infection in the paranasal sinuses utilizing a previously published method whereby the viscosity in a sealed container may be measured using an ultrasound Doppler method. As ultrasound propagates in a liquid medium, due to attenuation, the resulting pressure gradient will cause the liquid to move in the propagation direction - the wellknown effect of acoustic streaming. The streaming velocity will, for a given acoustic output, be proportional to the viscosity of the fluid. In this study, we verify that acoustic streaming can be induced in an anthropomorphic sinus phantom cast from a human cranium. The sinus phantom was made from agar with added graphite providing sound attenuation prior to the sinus cavity corresponding to an in vivo situation. A number of water-glycerol solutions with scattering particles, were prepared to mimic a clinically interesting range of viscosities (7-47 mPas). Using a 4.2 MHz continuous wave Doppler probe, clearly detectable Doppler shifts in the range of 6.5 to 20 Hz were recorded. A linear relationship was found between the Doppler shifts and 1/viscosity (R2=0.94, corrected for the square-law dependence of sound speed variation due to varying glycerol concentration)

Disputation

Nyckelord

  • Medicine and Health Sciences
  • water-glycerol solution
  • continuous wave Doppler probe
  • scattering particles
  • 4.2 MHz
  • Doppler shifts
  • 6.5 to 20 Hz
  • sinus cavity
  • sound attenuation
  • graphite
  • agar
  • human cranium
  • anthropomorphic sinus phantom
  • streaming velocity
  • acoustic streaming effect
  • fluid viscosity measurement
  • infection detection
  • paranasal sinuses
  • ultrasonic Doppler method
  • fluid property detection

Övriga

Proceedings of the International Federation for Medical & Biomedical Engineering. 13th Nordic Baltic Conference on Biomedical Engineering and Medical Physics
13-17 June 2005
Umea, Sweden
Published
Yes
  • ISBN: 91-7305-910-2

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