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Sensors 2017, 17(12), 2811; https://doi.org/10.3390/s17122811

Dual-Wavelength Laser Speckle Contrast Imaging (dwLSCI) Improves Chronic Measurement of Superficial Blood Flow in Hands

1
Biomedical Engineering Institute, School of Communication and Information Engineering, Shanghai University, Shanghai 200444, China
2
Department of Rehabilitation Medicine, Huashan Hospital, Fudan University, Shanghai 200040, China
3
Department of Anesthesiology, Renji Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai 200127, China
*
Author to whom correspondence should be addressed.
Received: 22 September 2017 / Revised: 3 November 2017 / Accepted: 28 November 2017 / Published: 5 December 2017
(This article belongs to the Special Issue Novel Sensors for Bioimaging)
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Abstract

Laser speckle contrast imaging (LSCI) has been widely used to determine blood flow and perfusion in biological tissues. The physical model of traditional LSCI ignores the effects of scattering property distribution in relation to speckle correlation time τc and blood flow v, which further results in biased estimation. In this study, we developed a dual-wavelength laser speckle contrast imaging (dwLSCI) method and a portable device for imaging the blood flow and tissue perfusion in human hands. Experimental data showed that dwLSCI could retrieve the vein vasculatures under the surface skin, and it further provided accurate measurements of vein blood flow signals, tissue perfusion signals, and fingertip perfusion signals, which assist with assessments of rehabilitation therapy for stroke patients. Fingertip perfusion signals demonstrated better performance in early assessments, while vein blood flow signals assisted the Fugl–Meyer Assessment Scale (FMA) and the Wolf Motor Function Test (WMFT) behavior assessments. As a general noninvasive imaging method, dwLSCI can be applied in clinical studies related to hand functions combined with behavior assessments. View Full-Text
Keywords: laser speckle contrast imaging; hand perfusion sensing; stroke rehabilitation; dual-wavelength laser speckle contrast imaging; hand perfusion sensing; stroke rehabilitation; dual-wavelength
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Zhang, L.; Ding, L.; Li, M.; Zhang, X.; Su, D.; Jia, J.; Miao, P. Dual-Wavelength Laser Speckle Contrast Imaging (dwLSCI) Improves Chronic Measurement of Superficial Blood Flow in Hands. Sensors 2017, 17, 2811.

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