Title :
Optimal design of thermistor probe for surface measurement of CBF
Author :
Wei, Datong ; Saidel, Gerald ; Jones, Stephen C.
Author_Institution :
Dept. of Biomed. Eng., Case Western Reserve Univ., Cleveland, OH, USA
Abstract :
Microthermistors used to continuously measure cerebral blood flow (CBF) from the cortical surface are discussed. Modeling and simulation techniques are used to examine the output sensitivity and frequency response to small perfusion changes. With an adiabatic tissue-environment interface, both constant power and constant temperature modes exhibit similar static, relative sensitivities that are proportional to thermistor radius, and similar low-pass frequency response. The cutoff frequency of the constant temperature mode is slightly higher and is inversely proportional to the surface area of the thermistor. The sensitivity will decrease if there is an unperfused layer surrounding the thermistor
Keywords :
biomedical equipment; biomedical measurement; brain; flow measurement; haemodynamics; probes; thermistors; adiabatic tissue-environment interface; cerebral blood flow measurement; cortical surface; cutoff frequency; frequency response; output sensitivity; small perfusion changes; surface measurement; thermistor probe optimal design; thermistor radius; unperfused layer; Biomedical measurements; Frequency response; Heat transfer; Heating; Isothermal processes; Probes; Steady-state; Temperature distribution; Temperature sensors; Thermistors;
Conference_Titel :
Engineering in Medicine and Biology Society, 1989. Images of the Twenty-First Century., Proceedings of the Annual International Conference of the IEEE Engineering in
Conference_Location :
Seattle, WA
DOI :
10.1109/IEMBS.1989.95955
