*5.3.3 Fluorescence angiography*

It commonly uses Indocyanine green dye (ICG) for measuring the fluorescence intensity at various areas of the involved limb, thereby allows a semi – quantitative measurement of regional perfusion and identifies the superficial collaterals in patients with arterial occlusions [30]. It is also used in patients with critical limb ischaemia to provide more rapid and quantitative information about foot perfusion [42].
