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Ultrasound Doppler for improved diagnosis of disease in the paranasal sinuses

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Author

Summary, in English

We propose a method to improve the diagnosis of infection in the paranasal sinuses, distinguishing between mucous and serous cases. The method utilizes 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 mean 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 (R<sup>2</sup>=0.94, corrected for the square-law dependence of sound speed variation due to varying glycerol concentration).

Publishing year

2005

Language

English

Pages

839-841

Publication/Series

Proceedings - IEEE Ultrasonics Symposium

Volume

2

Document type

Conference paper

Publisher

IEEE - Institute of Electrical and Electronics Engineers Inc.

Topic

  • Otorhinolaryngology

Keywords

  • Continuous-wave Doppler
  • Doppler probe
  • Sinus cavity

Conference name

IEEE Ultrasonics Symposium, 2005

Conference date

2005-09-18 - 2005-09-21

Conference place

Rotterdam, Netherlands

Status

Published

Research group

  • Laryngoesophagology, Allergy and Life Quality

ISBN/ISSN/Other

  • ISSN: 1051-0117
  • ISBN: 0780393821