IGA refers to the peripheral venous injection of lyophilized indocyanine green, a contrast agent that fluoresces when excited by a laser of specific wavelength A charge-coupled camera, held above the tissue of interest, can then detect the stimulated fluorescence and project an image of "real-time" tissue perfusion that is proportional to emission intensity. The application of IGA technology in reconstructive plastic surgery, a discipline that relies largely on immediate and accurate assessment of tissue perfusion, has recently generated much discussion.