Abstract
During laser-assisted cancer treatment, achieving a target-specific tumor ablation with minimum damage to surrounding normal tissues is a recent challenge. Nowadays, the various developments in nanotechnology include new techniques for this noninvasive photothermal tumor ablation process. A three-dimensional triple layered skin model with embedded tumor and countercurrent large blood vessels are chosen as the present computational domain. The diffusive heat equation in tissue and convective heat equation along with momentum equation in blood domain were solved using COMSOL Multiphysics (Bangalore, India) to predict the temperature field. The laser intensity distribution in tissue was modeled by modified Beer–Lambert law, whereas the tissue damage was predicted by solving the Arrhenius equation. A comparative study between intravenous (IV) and intratumoral (IT) infusion schemes of gold nanosphere (AuNp) was made considering both Pennes and the dual-phase lag (DPL) bioheat model to account the effect of relaxation time in bio-tissues. Numerical results show a better result for IT scheme in contrast to IV scheme in terms of tumor confined necrosis, sparing the neighboring healthy tissues and minimizing the heat sink effect of countercurrent blood vessels. During photothermal lesion ablation process, the effect of stratum corneum layer of skin is reflected by the differences in temperature plot at different layers of dermis, epidermis and subcutaneous. In an inhomogeneous tissue medium embedding AuNp clusters, the DPL model predicts more accurate results in terms of late thermal response to external laser irradiation as well as oscillating temperature history. The inclusion of relaxation times \(\tau_{q}\) and \(\tau_{T}\) in the DPL model enables the prediction of wavy characteristics of the thermal front that is traveling at a finite speed in biological tissue. Overall, the present computer simulation can improve the real clinical malignant tumor ablation process during laser-assisted thermotherapy.
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Abbreviations
- \(t\) :
-
Laser exposure time (s)
- \(R\) :
-
Beam radius (mm)
- D :
-
Diameter of rod (m)
- \(s\) :
-
Number of nanoparticles per unit volume, (m−3)
- \(T\) :
-
Temperature (°C)
- \(Q\) :
-
Vomumetric heat generation rate (W/m3)
- \(U\) :
-
Universal gas constant (J/mol K)
- C d :
-
Damaged concentration of protein
- C 0 :
-
Undamaged concentration of protein
- \(\nabla\) :
-
Gradient
- \(v\) :
-
Blood flow velocity
- \(C\) :
-
Specific heat (J/kg K)
- \(k\) :
-
Thermal conductivity (W/m K)
- \(x,y,z\) :
-
Coordinates (mm)
- I 0 :
-
Irradiated laser intensity (W/m2)
- ω b :
-
Blood perfusion rate (s−1)
- \(\Omega\) :
-
Damage integral
- \(h\) :
-
Ambient convective heat transfer coefficient, (W/m2 K)
- \(G\) :
-
Activation energy (J/mol K)
- \(A\) :
-
Pre-exponential factor (s−1)
- \(P\) :
-
Pressure (Pa)
- \(S\) :
-
Thermophysical and optical properties
- \(p,n\) :
-
Consistency and power law index
- \(q\) :
-
Heat flux
- \(f\) :
-
Volume force
- \(\eta\) :
-
Volumetric concentration (dimensionless)
- \(\rho\) :
-
Density (kg/m3)
- \(\psi\) :
-
Shear stress in blood medium
- \(\tau _{q}\) :
-
Heat flux phase lag
- \(\tau _{T}\) :
-
Temperature gradient phase lag
- \(\alpha\) :
-
Absorption coefficient (m−1)
- \(\beta\) :
-
Scattering coefficient (m−1)
- amb:
-
Ambient
- np:
-
Nanoparticle
- mix:
-
Mixture
- met:
-
Metabolic
- perf:
-
Perfusion
- b :
-
Blood
- t :
-
Tissue
- IT:
-
Intratumoral
- IV:
-
Intravenous
- IR:
-
Infrared
- AuNs:
-
Gold nanoshells
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Paul, A., Paul, A. (2022). Nanoparticle-Assisted Multilayered Photothermal Therapy Concerning Countercurrent Blood Flow: A Numerical Study. In: Mahanta, P., Kalita, P., Paul, A., Banerjee, A. (eds) Advances in Thermofluids and Renewable Energy . Lecture Notes in Mechanical Engineering. Springer, Singapore. https://doi.org/10.1007/978-981-16-3497-0_7
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