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Proceedings Paper

The importance of illumination in a non-contact photoplethysmography imaging system for burn wound assessment
Author(s): Weirong Mo; Rachit Mohan; Weizhi Li; Xu Zhang; Eric W. Sellke; Wensheng Fan; J. Michael DiMaio; Jeffery E. Thatcher
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Paper Abstract

We present a non-contact, reflective photoplethysmogram (PPG) imaging method and a prototype system for identifying the presence of dermal burn wounds during a burn debridement surgery. This system aims to provide assistance to clinicians and surgeons in the process of dermal wound management and wound triage decisions. We examined the system variables of illumination uniformity and intensity and present our findings. An LED array, a tungsten light source, and eventually high-power LED emitters were studied as illumination methods for our PPG imaging device. These three different illumination sources were tested in a controlled tissue phantom model and an animal burn model. We found that the low heat and even illumination pattern using high power LED emitters provided a substantial improvement to the collected PPG signal in our animal burn model. These improvements allow the PPG signal from different pixels to be comparable in both time-domain and frequency-domain, simplify the illumination subsystem complexity, and remove the necessity of using high dynamic range cameras. Through the burn model output comparison, such as the blood volume in animal burn data and controlled tissue phantom model, our optical improvements have led to more clinically applicable images to aid in burn assessment.

Paper Details

Date Published: 26 February 2015
PDF: 10 pages
Proc. SPIE 9303, Photonic Therapeutics and Diagnostics XI, 93030M (26 February 2015); doi: 10.1117/12.2080699
Show Author Affiliations
Weirong Mo, Spectral MD, Inc. (United States)
Rachit Mohan, Spectral MD, Inc. (United States)
Weizhi Li, Spectral MD, Inc. (United States)
Xu Zhang, Spectral MD, Inc. (United States)
Eric W. Sellke, Spectral MD, Inc. (United States)
Wensheng Fan, Spectral MD, Inc. (United States)
J. Michael DiMaio, Spectral MD, Inc. (United States)
Baylor Univ. Medical Ctr. (United States)
Jeffery E. Thatcher, Spectral MD, Inc. (United States)


Published in SPIE Proceedings Vol. 9303:
Photonic Therapeutics and Diagnostics XI
Hyun Wook Kang; Brian J. F. Wong; Melissa C. Skala; Bernard Choi; Guillermo J. Tearney; Andreas Mandelis; Nikiforos Kollias; Kenton W. Gregory; Mark W. Dewhirst; Justus F. Ilgner; Alfred Nuttal; Haishan Zeng; Laura Marcu; Claus-Peter Richter, Editor(s)

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