A novel methodology for signal recovery in linear time invariant system for medicine applications

• Autorzy: Melo M. D. B. , Araujo H. X. , Da Rocha F.

Identyfikatory

DOI

10.15199/48.2016.10.46

Warianty tytułu

PL

Nowa metoda odzyskiwania sygnału w układach cyfrowych stosowanych w medycynie bazująca na rozplocie

• Języki publikacji: EN

Abstrakty

EN

This paper presents a deconvolution based method that allows the improvement of the time response of a Swan-Ganz catheter. The goal of the deconvolution method is to obtain the input signal of an LTI system from the knowledge of its output and its impulse response. The noise causes degradation of the recovered signal, and this phenomenon is also discussed. The deconvolved signal is enriched in function of the cutoff frequency of the filter. It is shown that as the cutoff frequency increases, the deconvolved signal becomes more nosier. A Butterworth digital filter of third order, multiplied by the reverse impulse response was used in the frequency domain, and the response in frequency for the 1/H(s) function, limited for the various cutoff frequency of the filter are shown. It can be clearly observed that for higher cutoff frequency magnitude, the signal becomes completely distorted. Experiments with animals were used to measure the impulse response and the obtained results were satisfactory, with average error of 8.9%. The results suggest that the method can be useful in applications of linear systems.

PL

Opisano metodę poprawy odpowiedzi czasowej cewnika typu Swan_ganz bazująca na rozplocie. Umożlia to ocenę sygnału wejściowego na podstawie odpowiedzi układu I znajomosci odpowiedzi impulsowej. . W pracy analizowano wpływ filtru cyfrowego na parametry sygnału. Metode z dobrym rezultatem przetestowano na zwierzętach.

Słowa kluczowe

EN

thermodilution; deconvolution; signal recovery; medicine

PL

odzyskiwanie sygnału; rozplot; cewnik

• Wydawca: Wydawnictwo SIGMA-NOT
• Czasopismo: Przegląd Elektrotechniczny
• Rocznik: 2016
• Tom: R. 92, nr 10
• Strony: 199--203
• Opis fizyczny: Bibliogr. 11 poz., rys.

Twórcy

autor

Melo M. D. B.

• Universidade Federal Tocantins, Av: NS 15 ALC NO 14, 109 Norte - 77001-090, Palmas - TO, Brazil

autor

Araujo H. X.

• Universidade Federal Tocantins, Av: NS 15 ALC NO 14, 109 Norte - 77001-090, Palmas - TO, Brazil

autor

Da Rocha F.

• Faculdade de Engenharia, UnB Gama, Brasília, DF, Brazil

Bibliografia

• [1] Bickle, L. W., (1971). “A time domain deconvolution technique for the correction of transient measurements,” Report SC-RR- 71 06658, Sandia Laboratories, Albuquerque, New Mexico, Exploratory Measurements Division 1442, November.
• [2] da Rocha, A. F.; dos Santos, I.; Nascimento, F. A. O. & de Melo, M. D. B. (2005). Dieter Haemmerich and Jonathan W Valvano, “Effects of the time response of the temperature sensor on thermodilution measurements”, Physiol. Meas. 26.
• [3] da Rocha, A. F. (1997). “The Dynamic Behavior of Thermistor Probes”, Dissertation for degree of Doctor of Philosophy, University of Texas, Austin, May.
• [4] Dantzig, J. A. (1985). “Improved transient response of thermocouple sensors,” Rev. Sci. Instrum., v. 56, no. 5, pp. 723-725.
• [5] dos Santos, Í. (2000). Proposta de um método para medição da fração de ejeção do ventrículo direito, Dissertação (Mestrado em Engenharia Biomédica), Departamento de Engenharia Elétrica, Universidade de Brasília, Brasília.
• [6] Hori, J.; Saitoh, Y. & Kiryu, T. (1994). “Improvement of the time-domain response of a thermodilution sensor by the natural observation system,” IEICE Trans. Fundamentals, v. E77-A, n. 5, may.
• [7] de Melo, M. D. B. (2007). Algoritmo para Recuperação de Sinais de Temperatura de Cateteres de Artéria Pulmonar. Tese de Doutorado, Departamento de Engenharia Elétrica (ENE), Universidade de Brasília.
• [8] Riad, S., M., “The deconvolution problem: an overview,” Proceedings of the IEEE, v. 74, pp. 82-85, January 1986
• [9] Salgado, C. R., Galletti, P. M., “In vitro evaluation of the thermodilution technique for the measurement of ventricular stroke volume and End-Diastolic Volume,” Cardiologia, vol. 49, n.2, pp. 65-78, 1966.
• [10] Smith, S. W., The Scientist and Engineer's Guide to Digital Signal Processing, Second Edition. www.dspguide.com
• [11] Mouncastle, Vernon B., “Medical Physiology”, Copyright 1974 by The C. V. Mosby Company.

Uwagi

Opracowanie ze środków MNiSW w ramach umowy 812/P-DUN/2016 na działalność upowszechniającą naukę.