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Proceedings Paper

Single fiber, laser Doppler flowmetry (LDF) for detecting muscle microcirculation in the low leg and its technique improvement
Author(s): Hongming Cai; P. Ake Oberg; Hakan Rohman; Sven-Erik Larsson
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Paper Abstract

Percutaneous, single fiber LDF of 632.8 nm (He-Ne) is used for continuous recording of low leg muscle microcirculation. An optical fiber (0 equals 0.5 mm) was placed inside the tibialis ant. muscle 10 cm below the knee joint via a plastic cannula (0 equals 1.0 mm) and using local anaesthesia of the skin. The LDF is sampled continuously by the on-line PC computer one minute before, three minutes during and for four minutes after tourniquet occlusion. Twelve healthy, non-smoking men were examined. The reactive hyperaemia and the flux reactive time after release of tourniquet was examined successfully. To get better signal-to-noise ration and deeper detected volume in the muscle, the optical characteristics of ordinary fiber tips and modified spherical and `pear'-type ends were studied. Compared with the system of 632.8 nm, a new optical system with a laser diode of 790 nm was developed. A PC computer with DSP card was used for all the signal processing in the new system.

Paper Details

Date Published: 10 February 1995
PDF: 8 pages
Proc. SPIE 2331, Medical Sensors II and Fiber Optic Sensors, (10 February 1995); doi: 10.1117/12.201236
Show Author Affiliations
Hongming Cai, Linkoping Univ. (Sweden)
P. Ake Oberg, Linkoping Univ. (Sweden)
Hakan Rohman, Linkoping Univ. (Sweden)
Sven-Erik Larsson, Linkoping Univ. Hospital (Sweden)

Published in SPIE Proceedings Vol. 2331:
Medical Sensors II and Fiber Optic Sensors
Anna Maria Verga Scheggi; Francesco Baldini; Pierre R. Coulet; Otto S. Wolfbeis, Editor(s)

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