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How to Build a Laser Speckle Contrast Imaging LSCI System to Monitor Blood Flow

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Coherent hemodynamics spectroscopy in a single step.

Jana M Kainerstorfer¹, Angelo Sassaroli¹, Sergio Fantini¹

¹Department of Biomedical Engineering, Tufts University, 4 Colby Street, Medford, MA 02155, USA.

Biomedical Optics Express

|November 1, 2014

Summary

This summary is machine-generated.

A new Coherent Hemodynamics Spectroscopy (CHS) method uses a single thigh cuff release to induce cerebral hemodynamic oscillations. This faster technique provides accurate physiological data, improving monitoring applications.

Keywords:

(170.0170) Medical optics and biotechnology (170.4580) Optical diagnostics for medicine (170.6510) Spectroscopy, tissue diagnostics

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Published on: May 7, 2017

Area of Science:

Physiological monitoring
Biomedical engineering
Neuroscience

Background:

Coherent Hemodynamics Spectroscopy (CHS) previously induced oscillations one frequency at a time.
Accurate measurement of cerebral hemodynamics is crucial for understanding brain function and disease.

Purpose of the Study:

To develop and validate a novel, more efficient method for CHS using a single occlusion/release maneuver.
To demonstrate that this new method yields comparable physiological data to the previous sequential frequency method.

Main Methods:

Inducing cerebral hemodynamic oscillations via a single, rapid release of two pneumatic thigh cuffs (2 min at 200 mmHg).
Measuring the resulting ~20-second step response in systemic arterial blood pressure and cerebral hemodynamics using near-infrared spectroscopy (NIRS).
Analyzing the induced frequency spectrum using a hemodynamic model and comparing results with the sequential frequency method.

Main Results:

The single thigh cuff release method successfully induced cerebral hemodynamic oscillations containing necessary frequency information for CHS.
Validation on simulated data and human subjects showed the new method yields identical CHS spectra and physiological parameters compared to the previous method.
The new method provides a full bandwidth CHS spectrum over ~20 seconds, enhancing temporal invariance and allowing measurements every ~2.5 minutes.

Conclusions:

A single thigh cuff occlusion/release maneuver is a valid and efficient method for performing CHS.
This novel approach offers significant advantages in speed, temporal resolution, and data completeness for monitoring cerebral hemodynamics.
The improved CHS technique has potential for enhanced clinical monitoring and research applications.