Ultrasound Doppler for improved diagnosis of disease in the paranasal sinuses

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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).
Titel på värdpublikationProceedings - IEEE Ultrasonics Symposium
FörlagIEEE - Institute of Electrical and Electronics Engineers Inc.
ISBN (tryckt)0780393821
StatusPublished - 2005
EvenemangIEEE Ultrasonics Symposium, 2005 - Rotterdam, Nederländerna
Varaktighet: 2005 sep. 182005 sep. 21


ISSN (tryckt)1051-0117


KonferensIEEE Ultrasonics Symposium, 2005

Ämnesklassifikation (UKÄ)

  • Oto-rino-laryngologi


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