Improvement of the Time-Domain Response of a Thermodilution Sensor by the Natural Observation System

Jun'ichi HORI; Yoshiaki SAITOH; Tohru KIRYU

Improvement of the Time-Domain Response of a Thermodilution Sensor by the Natural Observation System

Jun'ichi HORI, Yoshiaki SAITOH, Tohru KIRYU

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When measuring the ejection fraction for the evaluation of the ventricular pumping function by means of the thermodilution technique, the slow response a conventional thermistor has caused it to be considered unsuitable, and fast thermistors have been proposed as an alternative. However, in this paper we propose improving the time-domain response of a conventional thermistor using a signal processing technique composed of a series of first-order high-pass filters which is known as the natural observation system. We considered the rise time of the thermistor in response to a step temperature change to effect correction for the measurement of the ejection fraction. The coefficients of the natural observation system were calculated by minimizing the square error between the step-response signal of the thermistor and the band-limited reference signal. In an experiment using a model ventricle, the thermodilution curve obtained from a conventional thermistor was improved using the proposed technique, thus enabling successful measurement of the ejection fraction of the ventricles.

Publication: IEICE TRANSACTIONS on Fundamentals Vol.E77-A No.5 pp.784-791

Publication Date: 1994/05/25

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Type of Manuscript: Special Section PAPER (Special Section on Signal Processing and System Theory)

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Jun'ichi HORI, Yoshiaki SAITOH, Tohru KIRYU, "Improvement of the Time-Domain Response of a Thermodilution Sensor by the Natural Observation System" in IEICE TRANSACTIONS on Fundamentals, vol. E77-A, no. 5, pp. 784-791, May 1994, doi: .
Abstract: When measuring the ejection fraction for the evaluation of the ventricular pumping function by means of the thermodilution technique, the slow response a conventional thermistor has caused it to be considered unsuitable, and fast thermistors have been proposed as an alternative. However, in this paper we propose improving the time-domain response of a conventional thermistor using a signal processing technique composed of a series of first-order high-pass filters which is known as the natural observation system. We considered the rise time of the thermistor in response to a step temperature change to effect correction for the measurement of the ejection fraction. The coefficients of the natural observation system were calculated by minimizing the square error between the step-response signal of the thermistor and the band-limited reference signal. In an experiment using a model ventricle, the thermodilution curve obtained from a conventional thermistor was improved using the proposed technique, thus enabling successful measurement of the ejection fraction of the ventricles.
URL: https://globals.ieice.org/en_transactions/fundamentals/10.1587/e77-a_5_784/_p

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@ARTICLE{e77-a_5_784,
author={Jun'ichi HORI, Yoshiaki SAITOH, Tohru KIRYU, },
journal={IEICE TRANSACTIONS on Fundamentals},
title={Improvement of the Time-Domain Response of a Thermodilution Sensor by the Natural Observation System},
year={1994},
volume={E77-A},
number={5},
pages={784-791},
abstract={When measuring the ejection fraction for the evaluation of the ventricular pumping function by means of the thermodilution technique, the slow response a conventional thermistor has caused it to be considered unsuitable, and fast thermistors have been proposed as an alternative. However, in this paper we propose improving the time-domain response of a conventional thermistor using a signal processing technique composed of a series of first-order high-pass filters which is known as the natural observation system. We considered the rise time of the thermistor in response to a step temperature change to effect correction for the measurement of the ejection fraction. The coefficients of the natural observation system were calculated by minimizing the square error between the step-response signal of the thermistor and the band-limited reference signal. In an experiment using a model ventricle, the thermodilution curve obtained from a conventional thermistor was improved using the proposed technique, thus enabling successful measurement of the ejection fraction of the ventricles.},
keywords={},
doi={},
ISSN={},
month={May},}

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TY - JOUR
TI - Improvement of the Time-Domain Response of a Thermodilution Sensor by the Natural Observation System
T2 - IEICE TRANSACTIONS on Fundamentals
SP - 784
EP - 791
AU - Jun'ichi HORI
AU - Yoshiaki SAITOH
AU - Tohru KIRYU
PY - 1994
DO -
JO - IEICE TRANSACTIONS on Fundamentals
SN -
VL - E77-A
IS - 5
JA - IEICE TRANSACTIONS on Fundamentals
Y1 - May 1994
AB - When measuring the ejection fraction for the evaluation of the ventricular pumping function by means of the thermodilution technique, the slow response a conventional thermistor has caused it to be considered unsuitable, and fast thermistors have been proposed as an alternative. However, in this paper we propose improving the time-domain response of a conventional thermistor using a signal processing technique composed of a series of first-order high-pass filters which is known as the natural observation system. We considered the rise time of the thermistor in response to a step temperature change to effect correction for the measurement of the ejection fraction. The coefficients of the natural observation system were calculated by minimizing the square error between the step-response signal of the thermistor and the band-limited reference signal. In an experiment using a model ventricle, the thermodilution curve obtained from a conventional thermistor was improved using the proposed technique, thus enabling successful measurement of the ejection fraction of the ventricles.
ER -