Abstract
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 (R<sup>2</sup>=0.94, corrected for the square-law dependence of sound speed variation due to varying glycerol concentration)
Original language | English |
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Title of host publication | Proceedings of the International Federation for Medical & Biomedical Engineering. 13th Nordic Baltic Conference on Biomedical Engineering and Medical Physics |
Publisher | Int. Federation for Medical and Biological Eng |
Pages | 115-116 |
ISBN (Print) | 91-7305-910-2 |
Publication status | Published - 2005 |
Event | Proceedings of the International Federation for Medical & Biomedical Engineering. 13th Nordic Baltic Conference on Biomedical Engineering and Medical Physics - Umea, Sweden Duration: 2005 Jun 13 → 2005 Jun 17 |
Conference
Conference | Proceedings of the International Federation for Medical & Biomedical Engineering. 13th Nordic Baltic Conference on Biomedical Engineering and Medical Physics |
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Country/Territory | Sweden |
City | Umea |
Period | 2005/06/13 → 2005/06/17 |
Subject classification (UKÄ)
- Oto-rhino-laryngology
Free keywords
- 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