New Quantitative Analysis Method Using HyperEye Medical System Image for Coronary Artery Bypass Grafting

Purpose: The current evaluation by indocyanine green angiography in coronary artery bypass patients has been performed by qualitative analysis. We devised an original quantitative analysis method using Image J. Methods: Indocyanine green angiography movie was converted to spatiotemporal images. Using the spatiotemporal image, an indocyanine green fluorescence intensity curve was drawn and converted to a firstderivative (acceleration) curve. Indocyanine green angiography evaluations were classified into four types. We collected the peak indocyanine green fluorescence intensity value (peak-I) and both time interval and ratio of maximum indocyanine green acceleration value (max dI/dt) between the mid and distal portions of the graft. Results: In 61 left internal thoracic artery grafts, 49 were patent and 12 were abnormal on CAG. There were significant differences between peak-I at the mid portion of the graft (221.47 ± 39.33 vs. 184.82 ± 40.15 gray scale) and time delay with max dI/dt (0.45 ± 1.28 vs. −1.00 ± 1.25 s), but there was no significant difference in the ratio of max dI/dt between patent and abnormal grafts. Conclusions: The spatiotemporal image method may become a model of the analysis software and the time interval of max dI/dt may become a predictor for future graft failure.