Thin Scattering Layers

Research on Science of Cosmetic Lasers

Thin Scattering Layers

PostPosted by DCNGA » Mon Aug 09, 2010 12:38 pm

I wish I was more scientific, but this seems somehow pertinent and important, so I will place it in the Resource section. I have looked up the "Monte Carlo Method" is, link follows this one that explains it.

http://www.ncbi.nlm.nih.gov/pubmed/20090800

Found the entire paper:

http://www.ichmt.org/upcoming-meetings/ ... ts/Eze.pdf

Appl Opt. 2010 Jan 20;49(3):358-68. doi: 10.1364/AO.49.000358.

Laser transport through thin scattering layers.
Eze R, Kumar S.

Thermal Optics Laboratory, Department of Mechanical Engineering, Polytechnic Institute of New York University, Six Metrotech Center, Brooklyn, New York 11201, USA. cjkstar@gmail.com

Abstract
Many modern applications of lasers involve understanding the transport of radiation through thin layers. The interactions of continuous wave and pulsed lasers with skin in dermatological use related to surgery and cosmetic procedures are examples of such. These highly scattering thin layers in skin are best modeled by the Monte Carlo method. However, most traditional Monte Carlo models may inaccurately account for the presence of thin layers. As an example, the very thin epidermis, with its highly absorbing melanin, is known to influence the laser penetration significantly. If the Monte Carlo model is implemented without special features, then the results of the simulation will show incorrect effects of thin layers because the path length of most photons would be significantly larger than the layer thickness. As a result, the computed photon travel path length would simply not feel the presence of the layer. In this paper, we present numerical and algorithmic features for computation of radiation transport through thin layers. It is noted that, while Monte Carlo without special features smears the radiative effect of the layers, the refined technique indicates that layers have a great impact on the absorption of energy, especially if the layer properties are distinctly different from those of the adjacent layers. The results have significant implications in the study of diagnostic and therapeutic applications of lasers in biomedicine and surgery.
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Re: Thin Scattering Layers

PostPosted by DCNGA » Mon Aug 09, 2010 12:43 pm

This is an explanation of what the Monte Carlo Method is:

http://en.wikipedia.org/wiki/Monte_Carl ... _transport

Seems to me (and goodness knows I could be very wrong) that this is all talking about the way the radiation disperses in the layers of skin? Not sure, just sort of guessing.
"It is a good thing to learn caution from the misfortunes of others."

"If you wish to succeed in life, make perseverance your bosom friend, experience your wise counselor, caution your elder brother, and hope your guardian genius."
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