NDLI: Bio-Heat Transfer Model of Human Eye Subjected to Retinal Laser Irradiation

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Narasimhan, Arunn Jha, Kaushal Kumar
Copyright Year	2010
Abstract	Retinopathy is a surgical process in which maladies of the human eye are treated by laser irradiation. A two-dimensional numerical model of the human eye geometry has been developed to investigate steady and transient thermal effects due to laser radiation. In particular, the influence of choroidal pigmentations and choroidal blood convection — parameterized as a function of choroidal blood perfusion are investigated in detail. The Pennes bio-heat transfer equation is invoked as the governing equation and a finite volume formulation is employed in the numerical method. The numerical model is validated with available experimental and two-dimensional numerical results. For a 500 μm diameter spot size, laser power of 0.2 W, with 100% absorption of laser radiation in the Retinal Pigmented Epithelium (RPE) region, the peak RPE temperature is observed to be 175 °C at steady state, with no blood perfusion in choroid. It reduces to 168.5 °C when the choroidal blood perfusion rate is increased to 23.3 kgm−3s−1. However, under transient simulations, the peak RPE temperature is observed to remain constant at 104 °C after 100 ms of the laser surgery period. A truncated three-dimensional model incorporating multiple laser irradiation spots is also developed to observe the spatial effect of choroidal blood perfusion. For a circular array of seven uniformly distributed spots of identical diameter and laser power of 0.2 W, steady and transient temperature evolution are presented with analysis.
Sponsorship	Heat Transfer Division
Starting Page	65
Ending Page	74
Page Count	10
File Format	PDF
ISBN	9780791849361
DOI	10.1115/IHTC14-22799
e-ISBN	9780791838792
Volume Number	2010 14th International Heat Transfer Conference, Volume 1
Conference Proceedings	2010 14th International Heat Transfer Conference
Language	English
Publisher Date	2010-08-08
Publisher Place	Washington, DC, USA
Access Restriction	Subscribed
Subject Keyword	Temperature Computer simulation Three-dimensional models Irradiation (radiation exposure) Human eye Laser beams Steady state Blood Convection Transients (dynamics) Geometry Absorption Numerical analysis Simulation Lasers Temperature effects Surgery Bioheat transfer Engineering simulation
Content Type	Text
Resource Type	Article

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