Page 12 - Read Online

Fok et al. Skin temperature of laser for Nevus of Ota

Figure 4: Plot of a patient’s facial skin temperature before Q-switched ruby laser treatment for Nevus of Ota with infrared thermal image
instrument

Figure 5: Plot of a patient’s facial skin temperature 15 s after Q-switched ruby laser treatment with an energy density of 9 J/cm 2

biochemistry occurs. [30] As such, an perfect heat transfer W C (Tb - T)/K + Q/K = 0,
b
b
analysis model is impossible obtain. It is common to Q = Q + Q + τ(ǝQ /ǝt + ǝQ /ǝt).
r
m
m
r
use the Pennes equation to approximate the prediction
of tissue temperature distrbution in bioheat transfer Here, K is presumed as a constant; Q represents the
studies. On the other hand, some researchers have changes of tissues in terms of the heat source (including
discovered that the behavior of waves has to be taken the metabolic rate of tissue); Q is the thermal energy
m
into account in bioheat transfer studies when using fast transformed from chemical energy caused by partial
heating systems. [31,32] This has led to the proposal of metabolism; [W C (Tb - T)] is the blood flow (the
b
b
the thermal wave theory and thermal wave equation. thermal energy transmitted from in/out controlled
The thermal wave equation can be expressed as: volume blood); Q shows the volumetric heating; K
r
[W/(m •k)] is the thermal conductivity; W [kg/(m •s)]
3
2
b
ǝ T/ǝx - (rCτ/K)*(ǝ T/ǝt ) - [(rC + τW C )/K]*(ǝT/ǝt) + is the blood perfusion rate; C and C [J(kg•k)] are the
2
2
2
2
b b b
Plastic and Aesthetic Research ¦ Volume 4 ¦ January 19, 2017 5