Thermal damage in three-dimensional vivo bio-tissues induced by moving heat sources in laser therapy

Ma, Jingxuan; Yang, Xianfeng; Sun, Yuxin; Yang, Jialing

doi:10.1038/s41598-019-47435-7

Cited by 26 publications

(15 citation statements)

References 29 publications

(32 reference statements)

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“…In animal experiments where the heart-rate is higher than in humans, because of the allometric scaling, a short time-lag is frequent, as we see in preclinical experiments [130]; see Fig- ure 19. Different time-lags have been used under various conditions in calculations [43].…”

Section: Discussionmentioning

confidence: 99%

Approaching Complexity: Hyperthermia Dose and Its Possible Measurement in Oncology

Szász¹,

Szász²

2021

OJBIPHY

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A heuristic stochastic solution of the Pennes equation is developed in this paper by applying the self-organizing, self-similar behaviour of living structures. The stochastic solution has a probability distribution that fits well with the dynamic changes in the living objects concerned and eliminates the problem of the deterministic behaviour of the Pennes approach. The solution employs the Weibull two-parametric distribution which offers satisfactory delivery of the rate of temperature change by time. Applying the method to malignant tumours obtains certain benefits, increasing the efficacy of the distortion of the cancerous cells and avoiding doing harm to the healthy cells. Due to the robust heterogeneity of these living systems, we used thermal and bioelectromagnetic effects to distinguish the malignant defects, selecting them from the healthy cells. On a selective basis, we propose an optimal protocol using the provided energy optimally such that molecular changes destroy the malignant cells without a noticeable effect on their healthy counterparts.

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Section: Discussionmentioning

confidence: 99%

Approaching Complexity: Hyperthermia Dose and Its Possible Measurement in Oncology

Szász¹,

Szász²

2021

OJBIPHY

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“…A higher value of τ q results in higher energy accumulation within the biological tissue and consequently significantly higher vibration characteristics in response to the elevated temperatures; while τ t refers to the phase lag due to the temperature gradient, i.e., heat flux vector precedes the temperature gradient. This lag eventually results in lower energy accumulation and lower peak temperatures within the biological tissue, and accordingly the increase in τ t results in diminishing vibration characteristic in thermal response [53,54]. Motivated by [21,53,54], three values of thermal lag have been selected for the biological tissue, viz., τ q = τ t = 0 (Fourier model), 1, 5.…”

Section: Effect Of Thermal Relaxation Timesmentioning

confidence: 99%

“…This lag eventually results in lower energy accumulation and lower peak temperatures within the biological tissue, and accordingly the increase in τ t results in diminishing vibration characteristic in thermal response [53,54]. Motivated by [21,53,54], three values of thermal lag have been selected for the biological tissue, viz., τ q = τ t = 0 (Fourier model), 1, 5. The effect of thermal relaxation times (τ q and τ t ) on the temperature distribution and ablation volume for cardiac ablation procedure has been presented in Figure 4 for ε = 0.3 and u in = 3 cm/s.…”

Section: Effect Of Thermal Relaxation Timesmentioning

confidence: 99%

Fluid–Structure Interaction and Non-Fourier Effects in Coupled Electro-Thermo-Mechanical Models for Cardiac Ablation

Singh

Melnik

2021

Fluids

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In this study, a fully coupled electro-thermo-mechanical model of radiofrequency (RF)-assisted cardiac ablation has been developed, incorporating fluid–structure interaction, thermal relaxation time effects and porous media approach. A non-Fourier based bio-heat transfer model has been used for predicting the temperature distribution and ablation zone during the cardiac ablation. The blood has been modeled as a Newtonian fluid and the velocity fields are obtained utilizing the Navier–Stokes equations. The thermal stresses induced due to the heating of the cardiac tissue have also been accounted. Parametric studies have been conducted to investigate the effect of cardiac tissue porosity, thermal relaxation time effects, electrode insertion depths and orientations on the treatment outcomes of the cardiac ablation. The results are presented in terms of predicted temperature distributions and ablation volumes for different cases of interest utilizing a finite element based COMSOL Multiphysics software. It has been found that electrode insertion depth and orientation has a significant effect on the treatment outcomes of cardiac ablation. Further, porosity of cardiac tissue also plays an important role in the prediction of temperature distribution and ablation volume during RF-assisted cardiac ablation. Moreover, thermal relaxation times only affect the treatment outcomes for shorter treatment times of less than 30 s.

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“…Additionally, the DPL model characterises microstructural interactions in heat transport and is developed with the first-order Taylor series expansion. Different methodologies have been employed to analyse the DPL bioheat model for single, double, and triple-layer thermal models [19][20][21][22][23][24][25][26]. These methods examine the difference in physiological and thermal properties of the skin.…”

Section: Introductionmentioning

confidence: 99%

Computational Modelling of Dual-Phase Lag Bioheat Process in Cooling of Cutaneous Tissue Exposed to High Heating for Burn Injury Prediction

Oguntala

Sobamowo

2021

Preprint

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Heat transfer in biological systems is critical in analytic and therapeutic burn applications. Timely burn evaluation and appropriate clinical management are critical to ameliorate the treatment outcome of burn patients. To apply appropriate burn treatment, it is necessary to understand the thermal parameters of the skin. The paper aims to model the non-Fourier bioheat process in the human skin using a multi-domain trivariate spectral collocation method to determine skin burn injury with non-ideal properties of tissue, blood perfusion and metabolism. The skin tissue internal water evaporation during direct heating is considered. Parametric studies on the effects of skin tissue properties, initial temperature, blood perfusion rate and heat transfer parameters for the thermal response and exposure time of triple-layer cutaneous tissues are carried out. The study shows that the initial tissue temperature, the thermal conductivity of the epidermis and dermis, relaxation and thermalisation time and convective heat transfer coefficient are critical parameters necessary for skin burn injury baseline examination. The thermal conductivity and blood perfusion rate also exhibit negligible effects on the burn injury threshold of the cutaneous tissue. The present study is aimed to assist burn evaluation for reliable experimentation, design and optimisation of thermal therapy delivery.

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Thermal damage in three-dimensional vivo bio-tissues induced by moving heat sources in laser therapy

Cited by 26 publications

References 29 publications

Approaching Complexity: Hyperthermia Dose and Its Possible Measurement in Oncology

Approaching Complexity: Hyperthermia Dose and Its Possible Measurement in Oncology

Fluid–Structure Interaction and Non-Fourier Effects in Coupled Electro-Thermo-Mechanical Models for Cardiac Ablation

Computational Modelling of Dual-Phase Lag Bioheat Process in Cooling of Cutaneous Tissue Exposed to High Heating for Burn Injury Prediction

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