Assessment of lower extremity ischemia using smartphone thermographic imaging

Peter H Lin, Marius Saines, Peter H Lin, Marius Saines

Abstract

Conventional diagnostic modalities for assessing arterial circulation or tissue perfusion include blood pressure measurement, ultrasound evaluation, and contrast-based angiographic assessment. An infrared thermal camera can detect infrared radiation energy from the human body, which generates a thermographic image to allow tissue perfusion analysis. We describe a smartphone-based miniature thermal imaging system that can be used as an adjunctive imaging modality to assess tissue perfusion. This smartphone-based camera device is noninvasive, simple to use, and cost-effective in assessing patients with lower extremity tissue perfusion. Assessment of patients with lower extremity arterial ischemia can be performed by a variety of diagnostic modalities, including ankle-brachial index, absolute systolic ankle or toe pressure, transcutaneous oximetry, arterial Doppler waveform, arterial duplex ultrasound, computed tomography scan, arterial angiography, and thermal imaging. We herein describe a noninvasive imaging modality using smartphone-based infrared thermography.

Figures

Fig 1
Fig 1
FLIR ONE thermal camera (FLIR Systems) is a smartphone-compatible device that captures thermal energy in the form of infrared radiation. The image shown in this smartphone is a left foot thermogram with normal tissue perfusion.
Fig 2
Fig 2
A, Preoperative infrared thermography in a patient (patient 2) with ischemic rest pain in the left foot and toes. B, Postoperative infrared thermography after femorotibial artery bypass demonstrated significant improvement in tissue perfusion in the toes.

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Source: PubMed

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