Tytuł artykułu
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Warianty tytułu
Measurement of attenuation and speed of 16 MHz and 20 MHz ultrasound in human blood of various haematocrit
Konferencja
XLVIII Otwarte Seminarium z Akustyki, Wrocław-Polanica Zdrój, 11-14 września 2001 r.
Języki publikacji
Abstrakty
The attenuation coefficient and the speed of 16 and 20 MHz ultrasound were determined in human blood at 37°C by the pulse - echo technique. Blood samples with haematocrit range 23.9 - 51.6 % and samples of plasma were measured. The mean attenuation coefficient increased linearly with haematocrit (HCT). The least squares regression function being ? = 2.64 + 0.081 HCT (dB/cm) for 16 MHz and ? = 3.61 + 0.087 HCT (dB/cm) for 20 MHz. The standard errors of estimate were 0.386 and 0.210 respectively. The speed of sound increased with haematocrit c = 1546 + 0.9 HCT (m/s) for 16 MHz and 20 MHz. The standard error of estimate was 2.8. The attenuation value varied from patient to patient. The authors conclude that in vivo a measurement of the haematocrit is possible with š3.5 HCT value accuracy, as a result of that variation.
Słowa kluczowe
Czasopismo
Rocznik
Tom
Strony
361--364
Opis fizyczny
bibliogr. 6 poz.
Twórcy
autor
autor
autor
- Instytut Podstawowych Problem´, Techniki PAN, ul. Świętokrzyska 21, Warszawa
Bibliografia
Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-article-BPW1-0016-0145