"JOURNAL OF RADIO ELECTRONICS" (Zhurnal Radioelektroniki ISSN 1684-1719, N 6, 2016

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usage of a priori information in dynamical inverse problems of passive acoustic thermometry

A. A. Anosov1,2

 1Kotel’nikov Institute of Radio-Engineering and Electronics of RAS

2 I.M. Sechenov First Moscow State Medical University

The paper is received on June 1, 2016

Abstract. Experimental results of temperature distribution reconstruction in the model plasticine objects and the human body were obtained with the help of passive acoustic thermometry. The objects under the study were heated and cooled and could be moved relatively receiving array. The array consisted of 14 probes based on broadband 1.6–2.5 MHz disc-shaped ultrasonic detectors with an 8 mm aperture. The probe threshold sensitivity was 0.3 K for the integration time in 10 s. The portable computer thermograph was used to measure the surface temperature of the human body. The temperature was measured in five experiments with the cooled fixed cylinder and forefinger (1), shifted heated cylinder (2), heated fixed parallelepiped (3), cooled the fixed parallelepiped and hand (4), heated fixed sphere (5). A priory information about the temperature distributions was used in reconstruction algorithms. Òhe temperature distributions were approximated by 1D, 2D, 3D Gaussians with time-varying parameters. The algorithms allowed to reconstruct four (in the 1–3 experiments) or five parameters (in the 5 experiment): the two or three spatial coordinates, size or two sizes and maximum temperature of heated region. The symmetrical distribution was reconstructed in the fourth experiment. In this case the only parameter was detected. The electronic journal format allows to demonstrate the time-varying temperature distributions with the help of an animation. The detection accuracy of the geometrical (about 1-2 mm) and temperature (about 0.5-1 K) parameters of the temperature distributions is acceptable for medical applications. The results were presented at Conference "Radars and Communications 9".

Key words: thermal acoustic radiation, acoustic thermometry, a priory information, inverse problems.


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