Passive estimation of internal temperatures making use of broadband ultrasound radiated by the body.
| Autor: | Anosov AA; Kotel'nikov Institute of Radio-engineering and Electronics of the Russian Academy of Sciences, Mokhovaya Street, 11, Building 7, Moscow 125009, Russia., Kazansky AS; Kotel'nikov Institute of Radio-engineering and Electronics of the Russian Academy of Sciences, Mokhovaya Street, 11, Building 7, Moscow 125009, Russia., Subochev PV; Institute of Applied Physics of the Russian Academy of Sciences, Ulyanov Street, 46, Nizhny Novgorod 603950, Russia., Mansfel'd AD; Institute of Applied Physics of the Russian Academy of Sciences, Ulyanov Street, 46, Nizhny Novgorod 603950, Russia., Klinshov VV; Lobachevsky State University of Nizhni Novgorod, Gagarin Avenue, 23/5, Nizhni Novgorod 603950, Russia. |
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| Jazyk: | angličtina |
| Zdroj: | The Journal of the Acoustical Society of America [J Acoust Soc Am] 2015 Apr; Vol. 137 (4), pp. 1667-74. |
| DOI: | 10.1121/1.4915483 |
| Abstrakt: | The internal temperatures of plasticine models and the human forearm in vivo were determined, based on remote measurements of their intrinsic ultrasonic radiation. For passive detection of the thermal ultrasonic radiation an acoustic radiometer was developed, based on a broadband 0.8-3.3 MHz disk-shaped ultrasonic detector with an 8 mm aperture. To reconstruct temperature profiles using the experimentally measured spectra of thermal acoustic radiation a priori information was used regarding the temperature distribution within the objects being investigated. The temperature distribution for heated plasticine was considered to be a monotonic function. The distribution for the human forearm was considered to fit a heat equation incorporating blood flow parameters. Using sampling durations of 45 s the accuracy of temperature measurement inside a plasticine model was 0.5 K. The measured internal temperature of the forearm in vivo, at 36.3 °C, corresponded to existing physiological data. The results obtained verify the applicability of this passive method of wideband ultrasonic thermometry to medical applications that involve local internal heating of biological tissue. |
| Databáze: | MEDLINE |
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