A Probe Technique for Determining the Thermal Conductivity of Tissue

摘要: A small needle-like probe has been developed for the determination of thermal conductivity either in-vitro or in-vivo tissue. This consists a copper cylinder having diameter 1.5 mm and length 22.5 mm. Constantan leads are attached to center top cylinder, respectively, as consequence acts thermocouple. The distinguishing characteristic this is that when it suddenly embedded into medium at different temperature, duration its temperature–time response such can be related properties medium. accomplished by match with an analytically determined curve which accounts metabolic heat generation, blood flow, conductive effects. By nondimensionalizing governing equations probe–tissue system, three nondimensional groups time, flow emerge. results parametric study these effects presented in tabular form. Initially, technique was used determine 1 percent agar–water mixture were within 5 water. Subsequently, experimental thermal-conductivity data obtained on following human organs: liver, kidney, heart, spleen, whole brain, brain gray matter, white matter. In addition, density, specific-heat, water-content measurements also organs. In-vivo have recently canine liver without flow. These indicate value approximately same after organ had removed refrigerated 24 hr. Blood if not considered, resulted apparent conductivities 15 25 higher than