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    Wyświetlanie 1-3 z 3
    Tytuł:
    Research and Medical Transcranial Doppler System
    Autorzy:
    Lewandowski, M.
    Walczak, M.
    Karwat, P.
    Witek, B.
    Karłowicz, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/177389.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Doppler system
    digital signal processing
    hardware-software partitioning
    field programmable gate array (FPGA)
    Opis:
    A new ultrasound digital transcranial Doppler system (digiTDS) is introduced. The digiTDS enables diagnosis of intracranial vessels which are rather difficult to penetrate for standard systems. The device can display a color map of flow velocities (in time-depth domain) and a spectrogram of a Doppler signal obtained at particular depth. The system offers a multigate processing which allows to display a numer of spectrograms simultaneously and to reconstruct a flow velocity profile. The digital signal processing in digiTDS is partitioned between hardware and software parts. The hardware part (based on FPGA) executes a signal demodulation and reduces data stream. The software part (PC) performs the Doppler processing and display tasks. The hardware-software partitioning allowed to build a flexible Doppler platform at a relatively low cost. The digiTDS design fulfills all necessary medical standards being a new useful tool in the transcranial field as well as in heart velocimetry research.
    Źródło:
    Archives of Acoustics; 2016, 41, 4; 773-781
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Application of Ultrasonic Methods to Flow Measurement and Detection of Microembolus in Heart Prostheses
    Autorzy:
    Gawlikowski, M.
    Lewandowski, M.
    Nowicki, A.
    Kustosz, R.
    Walczak, M.
    Karwat, P.
    Karłowicz, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1399342.pdf
    Data publikacji:
    2013-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    43.35.Yb
    43.80.Qf
    43.35.Ae
    Opis:
    For the last 20 years the world cardiosurgery has presented a considerable change of attitude to mechanical circulatory support. In spite of technological progress the main problems in ventricular assist devices are: thrombosis and low accuracy of flow measurements. In this paper the prototype of multi-gate Doppler flowmeter intended for cardiac assist system ReligaHeart EXT has been presented as well as the possibility of ultrasonic microembolus detection.
    Źródło:
    Acta Physica Polonica A; 2013, 124, 3; 417-420
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparison of the magnetic resonance imaging and acoustocerebrography signals in the assessment of focal cerebral microangiopathic lesions in patients with asymptomatic atrial fibrillation. (Preliminary clinical study results)
    Autorzy:
    Dobkowska-Chudon, W.
    Wrobel, M.
    Frankowska, E.
    Dabrowski, A.
    Karlowicz, P.
    Zegadlo, A.
    Krupienicz, A.
    Nowicki, A.
    Olszewski, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/331720.pdf
    Data publikacji:
    2016
    Wydawca:
    Polskie Towarzystwo Akustyczne
    Tematy:
    ultrasounds
    dispersion
    brain
    atrial fibrillation
    stroke
    Opis:
    Acoustocerebrography (ACG) is a set of techniques designed to capture states of human brain tissue, and its changes. It is based on noninvasive measurements of various parameters obtained by analyzing an ultrasound pulse emitted through the human’s skull. ACG and Magnetic Resonance Imaging (MRI) results were compared in a clinical study assessment of focal white-matter-lesions (WML) in the brains of patients with asymptomatic atrial fibrillation (AAF). The clinical study included 55 patients (age 66.1 ± 6.7 years). According to MRI data, the patients were assigned into four groups depending on the number of lesions: L0 - 0 to 4 lesions, L5 - 5 to 9 lesions, L10 - 10 to 29 lesions, and L30 - 30 or more lesions. As a result, it has been concluded that the ACG method could clearly differentiate the groups L0 (with 0 ÷ 4 lesions) and L30 (with more than 30 lesions) of WML patients. Fisher’s Exact Test shows that this correlation is highly significant (p < 0.001). ACG seems to be a new, effective, method for detecting WML for patients with AAF and can become increasingly useful in both diagnosing, and in stratifying, them. This, in turn, can be helpful in individualizing their treatment, so that the risk of strokes may become essentially reduced.
    Źródło:
    Hydroacoustics; 2016, 19; 83-92
    1642-1817
    Pojawia się w:
    Hydroacoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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