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Transient Simulation of Multi-Spot Retinal Laser Irradiation Using a Bio-Heat Transfer Model

Narasimhan, Arunn ; Jha, Kaushal Kumar

Numerical heat transfer. Part A, Applications, 1901-01, Vol.57 (7), p.520-536 [Periódico revisado por pares]

Philadelphia: Taylor & Francis Group

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  • Título:
    Transient Simulation of Multi-Spot Retinal Laser Irradiation Using a Bio-Heat Transfer Model
  • Autor: Narasimhan, Arunn ; Jha, Kaushal Kumar
  • Assuntos: Arrays ; Computer simulation ; Heat transfer ; Heating ; Irradiation ; Lasers ; Mathematical analysis ; Mathematical models ; Radiation ; Simulation ; Spots ; Temperature
  • É parte de: Numerical heat transfer. Part A, Applications, 1901-01, Vol.57 (7), p.520-536
  • Notas: ObjectType-Article-1
    SourceType-Scholarly Journals-1
    ObjectType-Feature-2
    content type line 23
  • Descrição: Transient numerical simulation of sequential, multi-spot, retinal laser irradiation resembling an actual surgery is performed. The retinal and adjacent regions are irradiated in a truncated three-dimensional computational domain by a 3 × 3 square array formed by nine uniformly distributed laser spots, each heated with 0.2 W power. A finite volume formulation of the bio-heat transfer model is employed as the governing equation to generate the temperature evolution. Within the heating duration of each retinal spot (∼100 ms), it is essential the temperature of the previously heated adjacent regions quickly reduce well below 60°C, the photocoagulation temperature. For an adjacent spot distance of D ≥ 0.6 mm, transient heat diffusion to the adjacent region is shown to be sufficient to reduce the retinal temperatures close to 37°C. Irrespective of the distance between two consecutive spots in an array, pulsating the laser power with a frequency determined to maintain the maximum temperature within ±10% of 60°C reduces excess heating and prevents long term retinal thermal damage.
  • Editor: Philadelphia: Taylor & Francis Group
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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