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Proceedings Paper

Thermographic and oxygenation imaging system for non-contact skin measurements to determine the effects of regional block anesthesia
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Paper Abstract

Regional anesthetic blocks are performed on patients who will undergo surgery of the hand. In this study, thermal and oxygenation imaging techniques were applied to observe the region affected by the peripheral block as a fast objective, non-contact, method compared to the standard pinpricks or cold sensation tests. The temperature images were acquired with an IR thermal camera (FLIR ThermoCam SC640). The data were recorded and analyzed with the ThermaCamTM Researcher software. Images at selected wavelengths were obtained with a CCD camera combined with a Liquid Crystal Tunable Filter (420-730 nm). The concentration changes of oxygenated and deoxygenated hemoglobin in the dermis of the skin were calculated using the modified Lambert Beer equation. In 10 patients an anesthetic block was placed by administering 20-30 ml Ropivacaine 7,5 mg/ml around the plexus brachialis. The anesthetic block of the axillary, ulnar, median and radial nerve causes dilatation of the blood vessels inducing an increase of blood flow and, consequently, an increase of the skin temperature and skin oxygenation in the lower arm. Both imaging methods showed distinct oxygenation and temperature differences at the surface of the skin of the hand with a good correlation with the areas with the nerve blocks. For oxygenation imaging a CCD camera with LED light source of selected wavelengths might be a relative inexpensive method to observe the effectiveness of regional blocks.

Paper Details

Date Published: 2 March 2010
PDF: 11 pages
Proc. SPIE 7548, Photonic Therapeutics and Diagnostics VI, 75484S (2 March 2010); doi: 10.1117/12.841645
Show Author Affiliations
John H. G. M. Klaessens, Univ. Medical Ctr. Utrecht (Netherlands)
Mattijs Landman, Univ. Medical Ctr. Utrecht (Netherlands)
Rowland de Roode, Univ. Medical Ctr. Utrecht (Netherlands)
Herke Jan Noordmans, Univ. Medical Ctr. Utrecht (Netherlands)
Rudolf M. Verdaasdonk, Free Univ. Medical Ctr (Netherlands)

Published in SPIE Proceedings Vol. 7548:
Photonic Therapeutics and Diagnostics VI
Anita Mahadevan-Jansen; Andreas Mandelis; Brian Jet-Fei Wong M.D.; Nikiforos Kollias; Henry Hirschberg M.D.; Kenton W. Gregory M.D.; Reza S. Malek; E. Duco Jansen; Guillermo J. Tearney; Steen J. Madsen; Bernard Choi; Justus F. R. Ilgner; Haishan Zeng; Laura Marcu, Editor(s)

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