1. SPY technology as an adjunctive measure for lower extremity perfusion
Benjamin Colvard, MD, Nathan K. Itoga, MD, Elizabeth Hitchner, MS, Qingfeng Sun, MD, Becky Long, MD, George Lee, MD, Venita Chandra, MD, Wei Zhou, MD 
Journal of Vascular Surgery 
Volume 64, Issue 1, Pages (July 2016)
DOI: /j.jvs
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2. Fig 1
Representative SPY technology findings before and after intervention. Iliac stenting was performed in the left common iliac artery. a, Fluorescence intensity curve before (top panel) and after (bottom panel) intervention. Ingress is defined as the rate at which fluorescence intensity increases on the plantar surface; peak perfusion is defined as the difference between the baseline and the peak of fluorescence intensity; egress is the rate at which intensity diminishes. b, Laser-assisted fluorescence angiography (LAFA) gray-scale image at maximal intensity of the left foot before (top panel) and after (bottom panel) intervention.
Journal of Vascular Surgery  , DOI: ( /j.jvs )
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3. Fig 2
a, Changes in ankle-brachial index (ABI) vs changes in ingress. b, Change in ABI vs change in peak perfusion.
Journal of Vascular Surgery  , DOI: ( /j.jvs )
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4. Fig 3
Example of embolization to the fourth toe that was not observed on completion angiography. a, Preprocedural laser-assisted fluorescence angiography (LAFA) heat map shows the ingress at the first metatarsal head (top panel) and fourth toe (lower panel). b, Postprocedural LAFA shows increased ingress to the first metatarsal head after revascularization to superficial femoral artery (top panel) but decreased ingress of the fourth toe due to embolization (lower panel).
Journal of Vascular Surgery  , DOI: ( /j.jvs )
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