Abstract
Administration of laser energy will be facilitated by a better understanding of the optical properties of the myocardium and the changes in optical properties during laser irradiation. The purpose of this study was (1) tc compare the optical properties of canine myocardium before and after laser irradiation and (2) to compare the optical properties of canine and human myocardium. Measurements were made with the double integrating sphere method. This study shows (1) a 40% increase in scattering coefficient as a result of photocoagulation and (2) that human and canine myocardium have comparable optical characteristics. The optical properties for normal and photocoagulated canine myocardium and for normal human myocardium are presented in Table 1. Photocoagulation resulted in a significant increase in scattering coefficient by 40% (P<O.Ol) and a 3% decrease in scattering anistropy factor (Pt0.01). No significant differences were found between the optical properties of normal canine and human myocardium.
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