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    Wyświetlanie 1-3 z 3
    Tytuł:
    Soft tissue-mimicking materials with various number of scatterers and their acoustical characteristics
    Autorzy:
    Kruglenko, E.
    Gambin, B.
    Cieślik, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/331726.pdf
    Data publikacji:
    2013
    Wydawca:
    Polskie Towarzystwo Akustyczne
    Opis:
    For the study of the temperature increase in the soft tissues irradiated by a low-power ultrasound [1], soft tissue-mimicking materials can be used. The phantoms have been produced based on an aqueous solution of agar, oil, and glass beads microparticles. The RF signals collected in the experiments enabled evaluation of the acoustic properties of phantoms with different number of strong scatterers (concentration varied from 0 to 30 pcs/mm3). Speed of sound (SOS) determined for the phantoms was similar to the value typical of soft tissue (about 1540 m/s). To determine attenuation coefficient the semi-transmission method has been used. Attenuation coefficient value varied from 0.5 to 1.1 dB/(MHz cm), depending on the number of scatterers. It was shown that the phantoms stored for 6 months preserved their acoustical properties and were usable for further experiments. It was found that within the total attenuation, the part corresponding to scattering can be distinguished.
    Źródło:
    Hydroacoustics; 2013, 16; 121-128
    1642-1817
    Pojawia się w:
    Hydroacoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On acoustic backscattering by Baltic zooplankton
    Autorzy:
    Górska, N.
    Cieślik, L.
    Didrikas, T.
    Hansson, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/332540.pdf
    Data publikacji:
    2007
    Wydawca:
    Polskie Towarzystwo Akustyczne
    Opis:
    Zooplankton is an important part of Baltic ecosystem and ecosystem-based management requires productivity assessment of the region what involves zooplankton identification and abundance estimation. Acoustics is recognized as a reliable monitoring method. Thus, the ability of understanding of backscattering by zooplankton becomes a priority. It was the main motivation of the paper. The main approach is based on (i) the numerical modeling of acoustic backscattering by the typical representative of Baltic zooplankton, mysids and (ii) comparison of the theoretical results with the measured acoustic data. The Modal Based Deformed Wave Born Approximation (MB-DWBA) model was employed. The readily available biologic data for mysids were used. The sensitivity of the backscattering to acoustic frequency, individual size, width of orientation distribution and acoustic properties of biologic tissue was analyzed. The results of modeling were verified using the measured acoustic and biologic data collected in August 2003 in the Swedish coastal zone near Stockholm.
    Źródło:
    Hydroacoustics; 2007, 10; 55-68
    1642-1817
    Pojawia się w:
    Hydroacoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evaluation of trabecular bone properties using ultrasonic scanne
    Autorzy:
    Cieślik, L.
    Litniewski, J.
    Lewandowski, M.
    Nowicki, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/331888.pdf
    Data publikacji:
    2010
    Wydawca:
    Polskie Towarzystwo Akustyczne
    Opis:
    Signals scattered in trabecular bone contain information about properties of the bone structure. Evaluation of this properties may be essential for osteoporosis diagnosis and treatment monitoring because the standard densitometry does not provide complete information about the bone strength. It was previously demonstrated that using numerical model of backscattering in trabecular bone it is possible to estimate some microstructural characteristics of bone. Model predicts departures from the Rayleigh statistics of the scattered signal envelope depended on the scatterer physical parameters and its shape uniformity. This study concerns examination of trabecular bone (calcaneus) in vivo. Ultrasonic bone scanner operating at frequency of 1,5 MHz was used to collect backscattered signals. Data were processed in order to obtain the statistical properties of the signal envelope and to compare them with histograms resulting from modeling. This study is an approach towards developing a tool for the investigation of scattering in trabecular bone that can potentially provide clinically useful information about bone strength and condition.
    Źródło:
    Hydroacoustics; 2010, 13; 39-52
    1642-1817
    Pojawia się w:
    Hydroacoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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