bioheat equation.pptx

8/17/2019 BIOHEAT EQUATION.pptx

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BIOHEAT EQUATION


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BIOHEAT TRANSFER

• Bioheat transfer is the study of heat transfer inbiological systes! In si"ler ters# it is the studyof ho$ heat o%es fro one co"artent# be it$ithin the body or e&ternal to the body# to another

co"artent in the body! Bioheat transfer has itsfoundations in the engineering disci"line of heattransfer and is itself a sub'eld ofbioedical engineering or bioengineering! In

addition# co"utational techni(ues to odel %ariousbioheat transfer scenarios are $idely e"loyed andhold an i"ortant "lace in de%elo"ing de%ices and"rotocols for the edical counity!

https://en.wikipedia.org/wiki/Heat_transferhttps://en.wikipedia.org/wiki/Biomedical_engineeringhttps://en.wikipedia.org/wiki/Biomedical_engineeringhttps://en.wikipedia.org/wiki/Heat_transfer


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)ONSTITUTI*E *A+UES

• Because odeling bioheat transfer is of the utost i"ortance in "ro"erde%ice or heating "rotocol design# constituti%e %alues of %arious tissues of thebody had to be easured early on in the history of bioheat transfer!

• Of "articular i"ortance $ere the %alues of s"eci'c gra%ity# s"eci'c heat#theral conducti%ity for the %arious tissues in the body e!g! s,in# fat# uscle#bone# and blood! Today# such %alues can be easily found in %arious handboo,s

and study "ublications such as the )R) Handboo, of -echanical Engineering./nd Ed!0 or the Re"ort of the tas, grou" on reference an .12340!

• To illustrate the detailed ,no$ledge that is re(uired by the bioheat transfercounity# The )R) Handboo, of -echanical Engineering includes a nearly /"age table of %alue for theral conducti%ity of %arious organs including butnot liited to5 ,idney# aorta# arterial "la(ue# blood# li%er# s"leen# heart#

uscle and tuor!• Because of the i"ortance of blood "erfusion on theral e(uilibria in the

body# blood "erfusion %alues $ere also "ursued early in the history of the'eld! The )R) Handboo, of -echanical Engineering6s cha"ter on Bioheat Transfer

https://en.wikipedia.org/wiki/Relative_densityhttps://en.wikipedia.org/wiki/Thermal_conductivityhttps://en.wikipedia.org/wiki/Thermal_conductivityhttps://en.wikipedia.org/wiki/Relative_density


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THE )AR7IO*AS)U+ARS8STE-

• The cardio%ascular syste is the ,ey syste by $hich heat isdistributed throughout the body! The blood ser%es as the%ehicle to trans"ort heat fro the areas of high heat to areasof lo$er heat! In general this transfer ta,es "lace in thedirection fro body core to e&treities such as the libs and

head! In the case $here the e&treities are hotter than thecore body te"erature# "erfusion $ould ser%e to trans"ortheat fro the e&treity bac, to$ards the body core! 9hetheror not the core te"erature rises de"ends on any factorssuch as the duration of ele%ated local te"erature at the

e&treity# te"erature di:erence bet$een e&treity and core#%olue of blood heated abo%e core te"erature# and the rateof blood "erfusion! This sae oderating "henoena of blood"erfusion can be a""lied to local heat transfer "robles e!g!heating of a tuor!

https://en.wikipedia.org/wiki/Circulatory_systemhttps://en.wikipedia.org/wiki/Thermoregulationhttps://en.wikipedia.org/wiki/Core_temperaturehttps://en.wikipedia.org/wiki/Core_temperaturehttps://en.wikipedia.org/wiki/Thermoregulationhttps://en.wikipedia.org/wiki/Circulatory_system


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BIOHEAT -O7E+S

• Here $e "resent a si"li'ed odel of the bioheat e(uation for steady;state# one;diensional heattransfer! Fro a one;diensional energy balance in the &;direction5

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bioheat equation.pptx

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