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Wyszukujesz frazę "temperature monitoring" wg kryterium: Temat

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    Tytuł:
    Temperature Monitoring during Focused Ultrasound Treatment by Means of the Homodyned K Distribution
    Autorzy:
    Byra, M.
    Kruglenko, E.
    Gambin, B.
    Nowicki, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1032313.pdf
    Data publikacji:
    2017-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    temperature monitoring
    homodyned K distribution
    focused ultrasound
    Opis:
    Temperature monitoring is essential for various medical treatments. In this work, we investigate the impact of temperature on backscattered ultrasound echo statistics during a high intensity focused ultrasound treatment. A tissue mimicking phantom was heated with a spherical ultrasonic transducer up to 56°C in order to imitate tissue necrosis. During the heating, an imaging scanner was used to acquire backscattered echoes from the heated region. These data was then modeled with the homodyned K distribution. We found that the best temperature indicator can be obtained by combining two parameters of the model, namely the backscattered echo mean intensity and the effective number of scatterers per resolution cell. Next, ultrasonic thermometer was designed and used to create a map of the temperature induced within the tissue phantom during the treatment.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 6; 1525-1528
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Temperature detection based on nonparametric statistics of ultrasound echoes
    Autorzy:
    Byra, M.
    Gambin, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/332315.pdf
    Data publikacji:
    2015
    Wydawca:
    Polskie Towarzystwo Akustyczne
    Tematy:
    noninvasive temperature monitoring
    nonparametric statistics
    ultrasound backscattering
    Opis:
    Different ultrasound echoes properties have been used for the noninvasive temperature monitoring. Temperature variations that occur during heating/cooling process induce changes in a random process of ultrasound backscattering. It was already proved that the probability distribution of the backscattered RF (radio frequency) signals is sensitive to the temperature variations. Contrary to previously used methods which explored models of scattering and involved techniques of fitting histograms to a special probability distribution two more direct measures of changes in statistics are proposed in this paper as temperature markers. They measure the ''distance'' between the probability distributions. The markers are the Kolmogorov Smirnov distance and Kulback-Leiber divergence. The feasibility of using such nonparametric statistics for non- invasive ultrasound temperature estimation is demonstrated on the ultrasounds data collected during series of heating experiments in which the temperature was independently registered by the classical thermometer or thermocouples.
    Źródło:
    Hydroacoustics; 2015, 18; 17-23
    1642-1817
    Pojawia się w:
    Hydroacoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-2 z 2

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