Method of Digital Processing of Video Thermogramms at Execution of the Open Heart Operations with Filtration of Visual Fields of Myocardium
Background. The implementation of the video data digital processing method of cardiac thermograms in the extracorporeal circulation is considered.
Objective. The aim of the paper is to apply digital image processing methods to the video sequence of cardiac thermograms to quantify the temperature gradient observed on the myocardium surface during hypothermia and hyperthermia in the extracorporeal circulation.
Methods. To obtain the initial video data, which represent a sequence of heart thermograms, a thermal imager, and a video capture and storage device are used. For analysing the temperature field, thermal imaging diagnostic methods, and digital image processing methods are used, which allow obtaining a binary image for quantitative evaluation of temperature gradients between blood in vessels and myocardium when the heart is heated or cooled, respectively.
Results. As a result of digital processing of the video data of the heart thermograms, the areas in the myocardium and the contours of the coronary vessels are distinguished, in which the temperature change is significantly ahead of or lagging behind the average temperature on the surface when the heart is heated or cooled. The application of the method of digital processing of thermograms allows visualizing the spread of temperature profiles on the myocardium surface and evaluating myocardial metabolism at different stages of perfusion.Conclusions. The results of video data digital processing of heart thermograms allow supplementing the information on the temperature and homogeneity of blood vessels during cooling and warming of the heart in the extracorporeal circulation. Non-invasive temperature control makes it possible to minimize the time of cardiopulmonary bypass and to provide conditions for maximum protection of the myocardium and brain in the extracorporeal circulation.
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