Diluted Indocyanine Green Angiography: a Novel Approach to Free Flap Perfusion Evaluation in Reconstructive Microsurgery

The patients were split into three different groups, the patient were given ICG with three different concentrations in a double-blind randomized manner postoperatively. The fluorescence emitted was quantitatively analyzed using the ImageJ software to ascertain the mean gray values, providing a robust measure of the ICGA concentration. The imaging was captured using a FLUORO 4000XL type NIR camera, positioned at a distance of 15-20 cm perpendicular to the flap.