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Wyszukujesz frazę "medical acoustics" wg kryterium: Wszystkie pola

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    Wyświetlanie 1-7 z 7
    Tytuł:
    Noninvasive acoustic blood volume measurement system for the POLVAD prosthesis
    Autorzy:
    Opilski, Z.
    Konieczny, G.
    Pustelny, T.
    Gacek, A.
    Kustosz, R.
    Gawlikowski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/200093.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    heart prosthesis
    medical acoustics
    blood volume measurement system
    Opis:
    The following paper presents researches concerning a noninvasive real-time blood volume measurement system applied in POLVAD prosthesis. The system is based on the acoustic Helmholtz resonator principle. The basis of the measurement method, followed by the preliminary tests of the possibility of incorporating the Helmholtz resonance idea into the POLVAD prosthesis is shown. The paper includes the actual measurement system construction and test results, both static and dynamic obtained at the Foundation for Cardiac Surgery Development in Zabrze, Poland. Conclusions and future plans are presented too.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2011, 59, 4; 429-433
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of changing body position on selected voice parameters
    Autorzy:
    Węglarz, Karolina
    Wszołek, Wiesław
    Hemmerling, Daria
    Powiązania:
    https://bibliotekanauki.pl/articles/24201974.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Poznańska. Instytut Mechaniki Stosowanej
    Tematy:
    speech acoustics
    signal processing
    medical diagnostics
    akustyka mowy
    przetwarzanie sygnałów
    diagnostyka medyczna
    Opis:
    Correct posture is a key element in the proper functioning of the entire body. Both defects and postural disorders lead to overload syndromes and degenerative changes in the musculoskeletal system. Different body positions correlate with respiratory parameters, which form the basis in modifying loudness and accentuation when speaking or singing Body posture can affect the quality of the voice signal and its fatigue. As movement and duration intensify, vocal effort increases. What is still open, however, is the problem of speech signal evaluation, especially in order to obtain assessments useful in the context of supporting medical diagnosis, optimizing therapy and monitoring rehabilitation. Meanwhile, such evaluations are what we need in medicine, rehabilitation and sports. This paper presents excerpts from a study of the effects of changes in posture and fatigue in healthy subjects, and those with phonation disorders, on changes in the acoustic parameters of the speech signal.
    Źródło:
    Vibrations in Physical Systems; 2022, 33, 3; art. no. 2022320
    0860-6897
    Pojawia się w:
    Vibrations in Physical Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mutually Orthogonal Golay Complementary Sequences in Medical Ultrasound Diagnostics. Experimental Study
    Autorzy:
    Trots, Ihor
    Żołek, Norbert
    Tasinkevych, Yuriy
    Wójcik, Janusz
    Powiązania:
    https://bibliotekanauki.pl/articles/31340110.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    coded excitation
    mutually orthogonal Golay codes
    synthetic aperture
    ultrasound imaging
    Opis:
    The objective of this paper is an experimental study of the most crucial parameters of the received acoustic signals (e.g. signal-to-noise ratio (SNR), side-lobes level (SLL), axial resolution) obtained as a result of simultaneous emission of mutually orthogonal Golay complementary sequences (MOGCS) to demonstrate their feasibility of being used in ultrasound diagnostics. Application of the MOGCS in ultrasound measurements allows the image reconstruction time to be shortened without decreasing the resulting quality of reconstructed images in comparison with regular complementary Golay coded sequences (CGCS). In this paper two sets of 16-bits long MOGCS were implemented in the Verasonics Vantage™ (Verasonics Inc., Kirkland, WA, USA) scanner. Ultrasound data were generated using a perfect reflector, a custom-made nylon wire phantom and tissue mimicking phantom. Parameters of the detected MOGCS echoes like SNR, SLL and axial resolution were determined and compared to that of the standard CGCS and the short two-sine cycles pulse. It was evidenced that applying MOGCS did not compromise the parameters of the separated and compressed echoes in comparison to the other types of transmitted signal – the CGCS and the short pulse. Concretely, both the MOGCS and CGCS yield similar SNR increase in comparison to the short pulse. Almost similar values of the axial resolution estimated at the full width at the half maximum level for all types of the transmitted signals were also obtained. At the same time, using the MOGCS the data acquisition speed can be increased twice in comparison with the CGCS signal.
    Źródło:
    Archives of Acoustics; 2022, 47, 3; 399-405
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Separation of Cells From Plasma by Means of Ultrasonics
    Autorzy:
    Włoch, Andrzej
    Czyż, Henryka
    Jasiński, Tadeusz
    Powiązania:
    https://bibliotekanauki.pl/articles/177025.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    ultrasound standing wave
    medical diagnostics
    body fluids
    blood
    red blood cells
    cells separation
    plasma
    Opis:
    This paper presents an analysis of use of ultrasonic standing wave in cell separation from bodily fluids based on the example of erythrocyte separation from plasma. It describes movement of red blood cells in plasma under the influence of the acoustic field (whose forces result from interaction of red blood cells with plasma as the vibrating medium) and under the influence of resistance forces in Stokes’ and Oseen’s approximation. The general properties of solutions of the motion equation are given. The solutions for the parameters of the ultrasonic wave and blood cells which are interesting in terms of practical applications in medical diagnostics are discussed. Time constants of the cell transportation to the regions of stable equilibrium in the field of ultrasonic standing wave are estimated. The formulas which determine the time needed to obtain the assumed concentration increase in plasma in nodes and/or anti-nodes of the standing wave are derived.
    Źródło:
    Archives of Acoustics; 2019, 44, 2; 357-363
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Speech Analysis as a Tool for Detection and Monitoring of Medical Conditions : A review
    Autorzy:
    Igras-Cybulska, Magdalena
    Hemmerling, Daria
    Ziółko, Mariusz
    Datka, Wojciech
    Stogowska, Ewa
    Kucharski, Michał
    Rzepka, Rafał
    Ziółko, Bartosz
    Powiązania:
    https://bibliotekanauki.pl/articles/31339837.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    speech analysis
    speech features
    acoustic parameters
    linguistic analysis
    voice biomarkers
    screening test
    Opis:
    The goal of this article is to present and compare recent approaches which use speech and voice analysis as biomarkers for screening tests and monitoring of some diseases. The article takes into account metabolic, respiratory, cardiovascular, endocrine, and nervous system disorders. A selection of articles was performed to identify studies that assess voice features quantitatively in selected disorders by acoustic and linguistic voice analysis. Information was extracted from each paper in order to compare various aspects of datasets, speech parameters, methods of applied analysis and obtained results. 110 research papers were reviewed and 47 databases were summarized. Speech analysis is a promising method for early diagnosis of certain disorders. Advanced computer voice analysis with machine learning algorithms combined with the widespread availability of smartphones allows diagnostic analysis to be conducted during the patient’s visit to the doctor or at the patient’s home during a telephone conversation. Speech analysis is a simple, low-cost, non-invasive and easy-toprovide method of medical diagnosis. These are remarkable advantages, but there are also disadvantages. The effectiveness of disease diagnoses varies from 65% up to 99%. For that reason it should be treated as a medical screening test and should be an indication of the need for classic medical tests.
    Źródło:
    Archives of Acoustics; 2023, 48, 3; 289-315
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evaluation of vocal acoustic and efficiency analysis parameters in medical students and academic teachers with use of iris and diagnoscope specialist software
    Autorzy:
    Zielińska-Bliźniewska, Hanna
    Sułkowski, Wiesław J.
    Pietkiewicz, Piotr
    Miłoński, Jarosław
    Mazurek, Agnieszka
    Olszewski, Jurek
    Powiązania:
    https://bibliotekanauki.pl/articles/2180085.pdf
    Data publikacji:
    2012-06-01
    Wydawca:
    Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
    Tematy:
    vocal acoustics and efficiency parameters
    software comparison
    Opis:
    Objectives: The aim of this study was to compare the parameters of vocal acoustic and vocal efficiency analyses in medical students and academic teachers with use of the IRIS and DiagnoScope Specialist software and to evaluate their usefulness in prevention and certification of occupational disease. Material and Methods: The study group comprised 40 women, including students and employees of the Military Medical Faculty, Medical University of Łódź. After informed consent had been obtained from the participant women, the primary medical history was taken, videolaryngoscopic and stroboscopic examinations were performed and diagnostic vocal acoustic analysis was carried out with the use of the IRIS and Diagno- Scope Specialist software. Results: Based on the results of the performed measurements, the statistical analysis evidenced the compatibility between two software programs, IRIS and DiagnoScope Specialist, with the only exception of the F4 formant. The mean values of vocal acoustic parameters in medical students and academic teachers, obtained by means of the IRIS software, can be used as standards for the female population not yet developed by the producer. When using the DiagnoScope Specialist software, some mean values were higher and some lower than the standards specified by the producer. Conclusions: The study evidenced the compatibility between two measurement software programs, IRIS and DiagnoScope Specialist, except for the F4 formant. It should be noted that the later has advantage over the former since the standard values of vocal acoustic parameters have been worked out by the producer. Moreover, they only slightly departed from the values obtained in our study and may be useful in diagnostics of occupational voice disorders.
    Źródło:
    International Journal of Occupational Medicine and Environmental Health; 2012, 25, 3; 236-241
    1232-1087
    1896-494X
    Pojawia się w:
    International Journal of Occupational Medicine and Environmental Health
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ultradźwięki w zastosowaniach medycznych – nowe możliwości pomiarowe Zakładu Mechaniki i Akustyki
    Medical ultrasounds – new metrological capabilities of Mechanics and Acoustics Department
    Autorzy:
    Dobrowolska, Danuta
    Falińska, Katarzyna
    Powiązania:
    https://bibliotekanauki.pl/articles/2200084.pdf
    Data publikacji:
    2022
    Wydawca:
    Główny Urząd Miar
    Tematy:
    moc ultradźwiękowa
    waga siły promieniowania
    onduktancja promieniowania
    przetwornik ultradźwiękowy
    hydrofon
    ultrasound power
    radiation force balance
    radiation conductance
    ultrasound transducer
    hydrophone
    Opis:
    Artykuł przedstawia aparaturę pomiarową do wzorcowań i badań w dziedzinie ultradźwięków w zastosowaniach medycznych, zakupioną dla Głównego Urzędu Miar w 2021 roku i jej możliwości pod kątem zapewnienia w Polsce spójności pomiarowej w tej dziedzinie. Przedstawia też stan badań nad wdrożeniem w GUM metod realizowanych za pomocą zakupionych systemów pomiarowych oraz wskazuje perspektywy rozwoju.
    The article presents measuring equipment for calibration and testing in the field of medical ultrasound, purchased for the Central Office of Measures in 2021, and its capabilities in terms of assuring measurement traceability in this area in Poland. It also presents the state of research on the implementation of the methods implemented in the GUM with the use of purchased measurement systems and indicates development prospects.
    Źródło:
    Metrologia i Probiernictwo : biuletyn Głównego Urzędu Miar; 2022, 1 (28); 37--42
    2300-8806
    Pojawia się w:
    Metrologia i Probiernictwo : biuletyn Głównego Urzędu Miar
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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