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Updated: Jun 24, 2025
How to Build a Laser Speckle Contrast Imaging LSCI System to Monitor Blood Flow
Published on: November 11, 2010
Compact and cost-effective laser-powered speckle contrast optical spectroscopy fiber-free device for measuring
Yu Xi Huang1, Simon Mahler1, Maya Dickson1
1California Institute of Technology, Department of Electrical Engineering, Pasadena, California, United States.
Significance:
In the realm of cerebrovascular monitoring, primary metrics typically include blood pressure, which influences cerebral blood flow (CBF) and is contingent upon vessel radius. Measuring CBF noninvasively poses a persistent challenge, primarily attributed to the difficulty of accessing and obtaining signal from the brain.
Aim:
Our study aims to introduce a compact speckle contrast optical spectroscopy device for noninvasive CBF measurements at long source-to-detector distances, offering cost-effectiveness, and scalability while tracking blood flow (BF) with remarkable sensitivity and temporal resolution.
Approach:
The wearable sensor module consists solely of a laser diode and a board camera. It can be easily placed on a subject's head to measure BF at a sampling rate of 80 Hz.
Results:
Compared to the single-fiber-based version, the proposed device achieved a signal gain of about 70 times, showed superior stability, reproducibility, and signal-to-noise ratio for measuring BF at long source-to-detector distances. The device can be distributed in multiple configurations around the head.
Conclusions:
Given its cost-effectiveness, scalability, and simplicity, this laser-centric tool offers significant potential in advancing noninvasive cerebral monitoring technologies.
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