Evaluation of local tissue blood flow by continuous direct measurement of thermal conductivity.

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Abstract
A modification of Gibbs'' method of thermal conductivity measurements by means of heated thermocouple probes is described which allows direct recording of thermal conductivity on a linear scale. The modification is based on continuously recording the electrical power required to maintain a chosen temperature difference between a heated needle probe and an unheated reference probe. The chosen temperature difference is automatically and continuously maintained by a servo controller, which adjusts the power input into a small heater winding on the probe. The method was applied in measurements of tissue blood flow in different locations in cat kidneys and in simultaneous recordings from left and right caudate in cat br ain.

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