@article{oai:niigata-u.repo.nii.ac.jp:00001924,
 author = {Hori, Jun'ichi and Saitoh, Yoshiaki and Kiryu, Tohru},
 issue = {5},
 journal = {IEICE transactions on fundamentals of electronics, communications and computer sciences, IEICE transactions on fundamentals of electronics, communications and computer sciences},
 month = {May},
 note = {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.},
 pages = {784--791},
 title = {Improvement of the Time-Domain Response of a Thermodilution Sensor by the Natural Observation System (Special Section on Signal Processing and System Theory)},
 volume = {E77-A},
 year = {1994}
}