Ultrasound Doppler for improved diagnosis of disease in the paranasal sinuses

Research output: Chapter in Book/Report/Conference proceedingPaper in conference proceeding

Abstract

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).

Details

Authors
Organisations
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Otorhinolaryngology

Keywords

  • Continuous-wave Doppler, Doppler probe, Sinus cavity
Original languageEnglish
Title of host publicationProceedings - IEEE Ultrasonics Symposium
PublisherIEEE--Institute of Electrical and Electronics Engineers Inc.
Pages839-841
Volume2
ISBN (Print)0780393821
Publication statusPublished - 2005
Publication categoryResearch
Peer-reviewedYes
EventIEEE Ultrasonics Symposium, 2005 - Rotterdam, Netherlands
Duration: 2005 Sep 182005 Sep 21

Publication series

Name
Volume2
ISSN (Print)1051-0117

Conference

ConferenceIEEE Ultrasonics Symposium, 2005
CountryNetherlands
CityRotterdam
Period2005/09/182005/09/21