Temperature dependence of thermal properties of < i > ex-vivo < /i > liver tissue up to ablative temperatures.

Temperature dependence of thermal properties of <i>ex-vivo</i> liver tissue up to ablative temperatures. Phys Med Biol. 2019 Apr 05;: Authors: Lopresto V, Argentieri A, Pinto R, Cavagnaro M Abstract Thermal properties of ex-vivo bovine liver were measured as a function of the temperature, by heating tissue samples in a temperature-controlled oil bath over a temperature range from about 21°C to about 113°C. Results evidenced temperature-dependent non-linear changes of the thermal properties, with the temperature of 100°C representing a break point: the thermal properties increased with temperature up to 99°C and then decreased above 100°C. The rate of increase appeared dramatic between 90°C and 99°C, owing to the onset of vaporisation of water contained into the tissue. In particular, at 99°C, the thermal conductivity reported an increase of about four times with respect to the value measured at 90°C, whilst about two-fold increase was reported for both the volumetric heat capacity and the thermal diffusivity. Temperatures higher than 100°C were reached only after complete vaporisation of water contained into the tissue, resulting in about 70% loss of weight for the tissue. An overall decrease of about 71% and 63% was reported for the thermal conductivity and volumetric heat capacity, respectively, in the temperature range 101-113°C. A decrease of about 25% was reported in the measured values of the thermal diff...
Source: Physics in Medicine and Biology - Category: Physics Authors: Tags: Phys Med Biol Source Type: research