Abstract
Photoplethysmography imaging (PPGI) is an optical technique that assesses tissue blood perfusion and can assist in the identification of necrotic, non-viable tissue. We present a non-contact PPGI method and prototype system that could aid clinicians and surgeons by improving wound triage decisions and dermal wound management. We assessed features of the non-contact PPGI system and evaluated their impact on the system's ability to generate useful outputs that discern healthy, viable tissue from necrotic, burned tissue. Uniformity and intensity parameters of the illumination source were identified as key variables.
Highlights
Bedside clinical evaluation remains the current standard of care, optical imaging technologies have been explored as potential solutions for assisting clinicians with wound management and blood perfusion measurements [1]
The configuration of the illumination plays an important role in an optical non-contact photoplethysmography imaging (PPGI) system
The illumination sources were assessed in both a tissue phantom model and a porcine burn model to evaluate the effect of these parameters on the quality of the PPG image outputs generated
Summary
Bedside clinical evaluation remains the current standard of care, optical imaging technologies have been explored as potential solutions for assisting clinicians with wound management and blood perfusion measurements [1]. Current technologies provide a quick, non-invasive method for superficial tissue assessment, and include color photography, thermography, laser Doppler imaging, indocyanine green video angiography (ICG), ultrasound (US), and nuclear imaging [3,4]. Limitations of these technologies include susceptibility to ambient temperature, reduced field of view, and requirement for dye. These limitations can lead to low-utility information and make the technology difficult to adopt in the clinical setting. Novel optical technologies under development such as multispectral imaging (MSI) and photoplethysmography imaging (PPGI) have shown promise and continue to be explored [1,5,6]
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