Optomechanical effect of tissue blood microcirculation under compression

Valentin M. Grimblatov; Alexander Ya. Bekshaev

doi:10.1117/12.308037

1 May 1998 Optomechanical effect of tissue blood microcirculation under compression

Valentin M. Grimblatov, Alexander Ya. Bekshaev

Author Affiliations +

Proceedings Volume 3253, Biomedical Sensing and Imaging Technologies; (1998) https://doi.org/10.1117/12.308037
Event: BiOS '98 International Biomedical Optics Symposium, 1998, San Jose, CA, United States

Abstract

The changes of diffuse reflected light by tissues with blood pulse circulation as function of external pressure was studied. The experimental measurements were performed with steady state and pulsatile components of the photoplethysmographic signal taken from human finger under compression. Specially designed reflection-mode sensor registered the true waveform of pulse waves. The unexpected change of the pulsatile amplitude from increasing to decreasing with compression was found. To explain this effect a Kubelka-Munk approximation model of a deformable medium with embedded particles of different types and concentrations was developed. On the basis of this model it is shown that the observed optomechanical effect is brought about by a shift of the balance between blood pressure and the external pressure of stressed vessel walls and surrounding media. The results show capability of photoplethysmographic technique to detect very small local tissue stress changes and to measure local vessel wall elasticity.

Citation Download Citation

Valentin M. Grimblatov and Alexander Ya. Bekshaev "Optomechanical effect of tissue blood microcirculation under compression", Proc. SPIE 3253, Biomedical Sensing and Imaging Technologies, (1 May 1998); https://doi.org/10.1117/12.308037

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