Comparative study of CO2 and Er:YAG laser heating of tissue using pulsed photothermal radiometry technique

Chebotareva, Galina P.; Zubov, B. V.; Nikitin, Alexander P.

doi:10.1117/12.207449

Cited by 4 publications

(13 citation statements)

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“…where m a is the tissue's absorption coefficient (3000 cm À1 for Er:YAG laser in skin tissue [42]), F o is the pulse fluence (J m À 2 ), and s p is the pulse duration. The second step was to calculate the maximum energy density (e max ) defined as the energy needed to reach the strain to failure (e max ).…”

Section: Strain-rate Dependent Tissue's Mechanical Propertiesmentioning

confidence: 99%

Investigation of laser pulsing parameters’ importance in Er:YAG laser skin ablation: a theoretical study conducted via newly developed thermo-mechanical ablation model

Elkhalil

Al-Zanina

Lweesy

et al. 2019

International Journal of Hyperthermia

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Objective: Importance of laser pulsing parameters and tissue's mechanical properties in the Er:YAG laser skin-tissue ablation is not adequately understood. The goal here was to develop a computational model that incorporates skin tissue's mechanical properties to investigate the influence of Er:YAG laser pulsing parameters on tissue ablation and coagulation. Methods: Tissue's mechanical properties were incorporated by modeling ablation as a tissue water vaporization occurring under elevated pressures that depend on tissue's stress-strain relationships. Tissue deformation was assumed unidirectional; therefore, a one-dimensional model was utilized. Analytical solution and experimental results were used to verify and validate the model. Then, influence of pulse duration (10 ms-2 ms) and fluence (0-30 J cm À2 ) on coagulation depth and ablation efficiency was explored. Results: Verification and validation results suggested that the model is acceptably accurate. Minimal effect of pulse duration on coagulation depth was predicted at sub-ablative conditions. At those conditions, coagulation depth increased asymptotically to $90 mm with increasing pulse fluence. At ablative conditions, coagulation depth decreased asymptotically to 22-28 mm with increasing pulse irradiance. Ablation efficiency plateaued at high pulse fluences and long pulse durations. Mechanical properties were important as about 50% increase in coagulation depth and 25% decrease in ablation efficiency were predicted when considering the high strain-rate loading effect in comparison with quasi-static loading. Conclusions: Proper tuning of Er:YAG laser pulsing parameters can substantially improve its therapeutic outcomes. The effect of these parameters varies and depends on whether the laser-tissue conditions are ablative or sub-ablative. ARTICLE HISTORY

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Section: Strain-rate Dependent Tissue's Mechanical Propertiesmentioning

confidence: 99%

Investigation of laser pulsing parameters’ importance in Er:YAG laser skin ablation: a theoretical study conducted via newly developed thermo-mechanical ablation model

Elkhalil

Al-Zanina

Lweesy

et al. 2019

International Journal of Hyperthermia

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“…This is called pulsed photothermal radiometry [116]. Chebotareva et al [117] and Zuerlein et al [42] utilized this approach to determine the magnitude of the absorption coefficient of enamel and dentin at highly absorbed laser wavelengths in the IR region. This approach can also be used to monitor changes in the hard tissues as the absorption coefficient changes with increasing temperature or by modification during laser irradiation [43].…”

Section: Thermal Imagingmentioning

confidence: 99%

Diagnostic Imaging and Spectroscopy

Fried

2012

Handbook of Biophotonics

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The sections in this article are Caries Detection Optical Properties of Dental Hard Tissue Optical Properties of Dental Hard Tissue in the Visible and Near‐Infrared Regions Optical Properties of Sound Enamel and Dentin Optical Property Changes of Demineralized Enamel Optical Properties of Dental Hard Tissue in the IR region Reflectance Spectroscopy Optical Transillumination Optical Coherence Tomography Fluorescence Imaging Quantitative Light Fluorescence ( QLF ) DIAGNO dent (Porphyrin Fluorescence) Other Fluorescence‐Based Imaging Methods Thermal Imaging Infrared Spectroscopy Raman Spectroscopy and Imaging Ultrasound and Terahertz Imaging

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“…Connection ofparameters in The Pulsed PhitothermaiRadiometry (surgical, low temperature ) laser irradiation of samples [1][2][3][4][5][6][7]. These parameters undoubtedly are needed and for physics-mathematics simulation of surgical laser action on tissue.…”

Section: Connection Of Parameters Of Incident Laser Radiation Opticamentioning

confidence: 99%

“…Also potatoes slices have been used since their optical and thermophysical properties are close to human skin. Obtained due to PPTR-method and the spectral investigations in the 3-1 1 tm range [1] the following absorption coefficients oftested tissue in vivo for radiation ofEr:YAG and CO2 lasers have been used:…”

Section: Samplesmentioning

confidence: 99%

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Pulsed photothermal radiometry of surgical laser-tissue interaction

Chebotareva¹,

Zubov

Nikitin

et al. 1996

SPIE Proceedings

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Achievements and prospects of PPTR-method for monitoring Icontrol of laser treatment in surgery purposes are presented. Connection of output laser parameters and ones of irradiated zone in tissue with parameters of measured thermal emission from irradiated tissue are analysed. There are presented the results of investigations of the high power laser-tissue interaction and of the processes of tissue destruction stimulated by middle-infrared-range pulsed lasers radiation in different sorts of tissues carried out by PPTR-technique. PPTR and Laser Mass-Spectrometry are united in study of evolution of tissue destruction under action of power CO2 laser. The evolution of thermal signal and, correspondingly, temperature in tissue under single laser pulse treatment with rise of energy density are obtained. Method of the temperature stroboscopy which allows to see very fast tissue heating stimulated by pulsed laser treatment more elaborate are presented.

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Comparative study of CO2 and Er:YAG laser heating of tissue using pulsed photothermal radiometry technique

Cited by 4 publications

References 3 publications

Investigation of laser pulsing parameters’ importance in Er:YAG laser skin ablation: a theoretical study conducted via newly developed thermo-mechanical ablation model

Investigation of laser pulsing parameters’ importance in Er:YAG laser skin ablation: a theoretical study conducted via newly developed thermo-mechanical ablation model

Diagnostic Imaging and Spectroscopy

Pulsed photothermal radiometry of surgical laser-tissue interaction

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