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Updated: Apr 25, 2026

Multiphoton Intravital Imaging for Monitoring Leukocyte Recruitment during Arteriogenesis in a Murine Hindlimb Model

Multiphoton Intravital Imaging for Monitoring Leukocyte Recruitment during Arteriogenesis in a Murine Hindlimb Model

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Mapping fast tissue dynamics with long camera exposures via intensity modulation.

Hengfa Lu¹, Qingwei Fang¹, Jewel A Ashbrook^1,2

¹Department of Biomedical Engineering, University of Texas at Austin, Austin, TX 78712.

Proceedings of the National Academy of Sciences of the United States of America

|April 23, 2026

Summary

This summary is machine-generated.

Sinusoidal Intensity Modulation Speckle Imaging (SIMSI) uses standard cameras to measure fast dynamics, like blood flow, by encoding information into long exposures. This technique provides a robust and accessible method for wide-field dynamic process characterization.

Keywords:

cerebral blood flow imaging dynamic light scattering laser speckle contrast imaging light intensity modulation power spectral density

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Area of Science:

Biomedical optics
Fluid dynamics
Image processing

Background:

Dynamic light scattering is crucial for imaging blood flow and complex fluids.
High frame rate cameras are often required, limiting accessibility and increasing costs.

Purpose of the Study:

Introduce Sinusoidal Intensity Modulation Speckle Imaging (SIMSI) to overcome hardware limitations in dynamic process measurement.
Enable wide-field, frequency-domain characterization of fast dynamics using standard cameras.

Main Methods:

SIMSI encodes fast dynamics into images captured with long camera exposures by sinusoidally modulating illumination intensity.
Frequency-selective speckle variance measurements sample the power spectral density (PSD) of intensity fluctuations.
Sweeping modulation frequency maps the PSD, and a spectral cutoff frequency is used as a flow index.

Main Results:

SIMSI measurements in microfluidic phantoms show agreement with high-speed detectors, with the flow index correlating linearly with velocity.
In vivo mouse cortex imaging reveals distinct spectral signatures for different vascular compartments.
SIMSI successfully tracked spatiotemporal changes in cortical blood flow post-ischemic stroke.

Conclusions:

SIMSI offers a robust, accessible, wide-field method for characterizing fast dynamics using standard cameras.
This technique enhances the characterization of complex systems in biomedicine, engineering, and physics.
SIMSI provides a valuable tool for studying dynamic processes where high-speed imaging is otherwise prohibitive.