Fig. 1From: Peripheral vascular disease assessment in the lower limb: a review of current and emerging non-invasive diagnostic methodsExamples of peripheral vascular function assessment in the lower limb using plethysmography techniques; a strain gauge plethysmography [37]; b photo plethysmography (PPG); c quantitative PPG/light reflection rheography (LRR); d Impedance Plethysmography, modified from [38]; e Air Plethysmography (APG) [39]Back to article page