Quantitative assessment of ischemia and reactive hyperemia of the dermal layers using multi - Spectral imaging on the human arm

Jana M. Kainerstorfer, Franck Amyot, Stavros G. Demos, Moinuddin Hassan, Victor Chernomordik, Christoph K. Hitzenberger, Amir H. Gandjbakhche, Jason D. Riley

Research output: Chapter in Book/Report/Conference proceedingConference contribution

5 Scopus citations

Abstract

Quantitative assessment of skin chromophores in a non-invasive fashion is often desirable. Especially pixel wise assessment of blood volume and blood oxygenation is beneficial for improved diagnostics. We utilized a multi-spectral imaging system for acquiring diffuse reflectance images of healthy volunteers' lower forearm. Ischemia and reactive hyperemia was introduced by occluding the upper arm with a pressure cuff for 5min with 180mmHg. Multi-spectral images were taken every 30s, before, during and after occlusion. Image reconstruction for blood volume and blood oxygenation was performed, using a two layered skin model. As the images were taken in a non-contact way, strong artifacts related to the shape (curvature) of the arms were observed, making reconstruction of optical / physiological parameters highly inaccurate. We developed a curvature correction method, which is based on extracting the curvature directly from the intensity images acquired and does not require any additional measures on the object imaged. The effectiveness of the algorithm was demonstrated, on reconstruction results of blood volume and blood oxygenation for in vivo data during occlusion of the arm. Pixel wise assessment of blood volume and blood oxygenation was made possible over the entire image area and comparison of occlusion effects between veins and surrounding skin was performed. Induced ischemia during occlusion and reactive hyperemia afterwards was observed and quantitatively assessed. Furthermore, the influence of epidermal thickness on reconstruction results was evaluated and the exact knowledge of this parameter for fully quantitative assessment was pointed out.

Original languageEnglish (US)
Title of host publicationProgress in Biomedical Optics and Imaging - Proceedings of SPIE
Volume7369
DOIs
StatePublished - 2009
Externally publishedYes
EventDiffuse Optical Imaging II - Munich, Germany
Duration: Jun 14 2009Jun 17 2009

Other

OtherDiffuse Optical Imaging II
CountryGermany
CityMunich
Period6/14/096/17/09

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Keywords

  • Blood oxygenation
  • Curvature correction
  • Multi-spectral imaging
  • Occlusion
  • Quantitative skin imaging

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Radiology Nuclear Medicine and imaging

Cite this

Kainerstorfer, J. M., Amyot, F., Demos, S. G., Hassan, M., Chernomordik, V., Hitzenberger, C. K., Gandjbakhche, A. H., & Riley, J. D. (2009). Quantitative assessment of ischemia and reactive hyperemia of the dermal layers using multi - Spectral imaging on the human arm. In Progress in Biomedical Optics and Imaging - Proceedings of SPIE (Vol. 7369). [73690P] https://doi.org/10.1117/12.831664