Ultrasound Doppler for improved diagnosis of disease in the paranasal sinuses
Författare
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).
Avdelning/ar
Publiceringsår
2005
Språk
Engelska
Sidor
839-841
Publikation/Tidskrift/Serie
Proceedings - IEEE Ultrasonics Symposium
Volym
2
Dokumenttyp
Konferensbidrag
Förlag
IEEE - Institute of Electrical and Electronics Engineers Inc.
Ämne
- Otorhinolaryngology
Nyckelord
- 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
Forskningsgrupp
- Laryngoesophagology, Allergy and Life Quality
ISBN/ISSN/Övrigt
- ISSN: 1051-0117
- ISBN: 0780393821