Title :
Estimation of blood perfusion using phase shift in temperature response to sinusoidal heating at the skin surface
Author :
Liu, Jing ; Xu, Lisa X.
Author_Institution :
Sch. of Mech. Eng., Purdue Univ., West Lafayette, IN, USA
Abstract :
A closed form analytical solution of the Pennes´ bioheat equation was obtained for temperature distributions in the skin tissue subject to the sinusoidal heat flux. Phase shifts in the surface temperature response were revealed to be related to local blood perfusion rate and heating frequency. The influence of the thermal contact resistance on the perfusion estimation was investigated. It has been proved that this influence is relatively small because of the phase shift based estimation and can be effectively eliminated by application of highly conductive grease. This analysis provides the theoretical foundation for a new noninvasive modality of blood perfusion estimation based on the surface temperature measurement which can have significant applications in future clinical practices.
Keywords :
biothermics; blood flow measurement; haemorheology; heat transfer; skin; temperature distribution; thermal conductivity; thermal resistance; Pennes´ bioheat equation; blood perfusion estimation; closed form analytical solution; heating frequency; highly conductive grease effect; local perfusion rate; microcirculation; noninvasive modality; phase shift; sensitivity analysis; sinusoidal heating; skin surface; specific heat; temperature distributions; temperature response; thermal contact resistance; Blood; Equations; Frequency; Heating; Phase estimation; Response surface methodology; Skin; Surface resistance; Temperature distribution; Thermal resistance; Algorithms; Blood Flow Velocity; Body Temperature Regulation; Electric Conductivity; Humans; Models, Biological; Muscle, Skeletal; Sensitivity and Specificity; Skin; Surface Properties; Time Factors;
Journal_Title :
Biomedical Engineering, IEEE Transactions on
