Single fiber, laser Doppler flowmetry (LDF) for detecting muscle microcirculation in the low leg and its technique improvement

Hongming Cai; P. Ake Oberg; Hakan Rohman; Sven-Erik Larsson

doi:10.1117/12.201236

10 February 1995 Single fiber, laser Doppler flowmetry (LDF) for detecting muscle microcirculation in the low leg and its technique improvement

Hongming Cai, P. Ake Oberg, Hakan Rohman, Sven-Erik Larsson

Author Affiliations +

Proceedings Volume 2331, Medical Sensors II and Fiber Optic Sensors; (1995) https://doi.org/10.1117/12.201236
Event: International Symposium on Biomedical Optics Europe '94, 1994, Lille, France

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.

Citation Download Citation

Hongming Cai, P. Ake Oberg, Hakan Rohman, and Sven-Erik Larsson "Single fiber, laser Doppler flowmetry (LDF) for detecting muscle microcirculation in the low leg and its technique improvement", Proc. SPIE 2331, Medical Sensors II and Fiber Optic Sensors, (10 February 1995); https://doi.org/10.1117/12.201236

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