Modeling of blood vessel heating by laser radiation

Astaf’eva, L. G.; Zheltov, G. I.; Rubanov, A. S.

doi:10.1134/1.1351581

Cited by 13 publications

(6 citation statements)

References 11 publications

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“…By moving from the illuminated part of the cylindrical vessel to the shadow, the energy density is reduced by a factor of 3–3.5 to the minimal value on the shaded vessel surface. With increase in blood vessel diameter from 50 µm by 10–500 µm, the maximum source of energy is increased by a factor of 1.7 15 . In practise, however, the maximum temperature of vessels irradiated by laser is near to its centre in the open lumen.…”

Section: Theoretical Considerationsmentioning

confidence: 99%

“…Histologic examination disclosed venous thrombosis, erythrocyte extravasation and haemosiderin deposits responsible for hyperpigmentation 39 . More recently, pulsed dye lasers with longer wavelength (up to 600 nm) and extended pulse duration (= 40 ms) have been developed that produce less purpura and allow a deeper tissue penetration 15,40 …”

Section: Theoretical Considerationsmentioning

confidence: 99%

“…With increase in blood vessel diameter from 50 µ m by 10-500 µ m, the maximum source of energy is increased by a factor of 1.7. 15 In practise, however, the maximum temperature of vessels irradiated by laser is near to its centre in the open lumen. The maximum heating temperature inside the vessel depends on the fluence.…”

Section: Pulse Durationmentioning

confidence: 99%

“…39 More recently, pulsed dye lasers with longer wavelength (up to 600 nm) and extended pulse duration (= 40 ms) have been developed that produce less purpura and allow a deeper tissue penetration. 15,40 Long-pulsed dye lasers have been proven to be more efficacious in treatment of spider leg veins than shortpulsed ones ( Table 4). Whereas the clearing after repeated courses is good for nontanned light skin and vessel diameters < 1.5 mm 41 the results in treating larger calibre leg vessels (> 0.4 mm) are disappointing.…”

Section: Pulsed Dye Lasermentioning

confidence: 99%

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Laser therapy of spider leg veins

Wollina

Hercogová

et al. 2003

J of Cosmetic Dermatology

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Section: Theoretical Considerationsmentioning

confidence: 99%

Section: Theoretical Considerationsmentioning

confidence: 99%

Section: Pulse Durationmentioning

confidence: 99%

Section: Pulsed Dye Lasermentioning

confidence: 99%

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Laser therapy of spider leg veins

Wollina

Hercogová

et al. 2003

J of Cosmetic Dermatology

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“…Однако, сложность объекта воздействия (кожа, подкожные слои, нервные стволы, кровеносные сосуды органы) обуславливает необходимость дальнейшего изучения явлений, возникающих при этом. В работах [1][2][3][4] и многих других изучены различные случаи нагрева поверхности кожи человека и прилегающих к ней внутренних слоев. В данной работе исследуется математическая модель процесса локального нагрева нервного ствола некоторой области ткани под поверхностью кожи излучением лазера, которое введено внутрь ткани через тонкий световод световодом.…”

Section: Introductionunclassified

Thermal processes during local laser heating of biological tissues

2019

Photobiology and Photomedicine

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Introduction. Lasers in medicine are currently widely used for both diagnosis and treatment. Studies of the thermal processes that occur when a person is exposed to laser radiation have made it possible to developinnovative methods of treating many diseases. Purpose: to study thermal processes in biological tissues during their local laser heating (mathematical model and experiment). Materials and methods. Using the developed mathematical model of the process of local heating of a certain region inside biological tissue, we studied the process of heating the environment by continuous and pulsed laser radiation using infrared light with a wavelength of 0.98 μm, red light with a wavelength of 0.65 μm, green light with a wavelength 0.5 microns and blue light with a wavelength of 0.435 microns. Results. The sizes of the heated region, the time of establishment and decrease in temperature are determined. The calculation results are in good agreement with the obtained experimental data. Findings. The mode of heating biological tissue with laser radiation depends on the wavelength. The maximum heating temperature of the irradiated section with a radiation pulse duration much shorter than the thermal time constant is independent of the shape and duration of the pulse and is determined only by the energy of the absorbed radiation. The distribution of heat into the medium during the duration of the pulse is determined by its duration and thermal diffusivity of the tissue. To reduce the heating of the surrounding tissue, it is necessary to use short radiation pulses. The progress of tissue heating by a sequence of radiation pulses depends on the relationship between the duration of the pulses, the period of their repetition, and the thermal time constant of the medium. The average (smoothed) temperature is the same as when heated with continuous power equal to the average power of the pulse-modulated radiation.

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