Thermal analysis of blood undergoing laser photocoagulation

Jennifer Kehlet Barton, Dan P. Popok, John F. Black

Research output: Contribution to journalArticle

21 Scopus citations

Abstract

The temperature of blood undergoing laser-induced photocoagulation during long-pulse (10 ms) 532 nm irradiation was measured in a time- and spatially-resolved manner using a novel technique. This method is based on the change in reflectivity of a solid-liquid interface given a dynamically changing refractive index in the liquid phase. In our case, the temperature-dependent change in the refractive index of blood was utilized, and the reflectivity at a glass-blood interface was measured. Measurements were compared to predictions from a finite-element model incorporating the effects of time-dependent changes in the absorption coefficients of the blood, and phase changes representing coagulation and the liquid/vapor transition. Previous studies have linked the onset of blood coagulation to a sharp rise in the 532-nm reflectance of the blood. Based on the thermal measurements and the results of an Arrhenius analysis, we postulate that the reflectance rise is a combination of protein denaturation and red blood cell conformal changes.

Original languageEnglish (US)
Pages (from-to)936-943
Number of pages8
JournalIEEE Journal on Selected Topics in Quantum Electronics
Volume7
Issue number6
DOIs
StatePublished - Nov 1 2001

Keywords

  • Biomedical applications of radiation
  • Blood
  • Lasers
  • Modeling
  • Photocoagulation
  • Reflectometry

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering

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