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Full-field functional optical angiography.

Mingyi Wang, Wenjian Mao, Caizhong Guan

|February 2, 2017

Summary

This summary is machine-generated.

We developed a new optical angiography technique using absorption intensity fluctuation modulation (AIFM) to image blood flow in live specimens. This label-free method visualizes red blood cells and measures blood flow velocity non-invasively.

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Area of Science:

Biomedical Optics
Physiology
Medical Imaging

Background:

Functional optical angiography is crucial for studying blood circulation.
Existing methods may require contrast agents or lack label-free capabilities.
Visualizing microvasculature in live, near-transparent specimens presents challenges.

Purpose of the Study:

To introduce a novel full-field functional optical angiography technique.
To utilize the absorption intensity fluctuation modulation (AIFM) effect for label-free imaging.
To simultaneously measure blood flow velocity in live biological samples.

Main Methods:

Employing low-coherence light illumination to exploit absorption differences between red blood cells (RBCs) and background tissue.
Leveraging the AIFM effect generated by moving RBCs in capillary vessels.
Computing averaged and real-time modulation depths for image generation and velocity measurement.

Main Results:

Achieved high-contrast, label-free optical angiography.
Demonstrated sensitivity to low-coherence interference between RBCs and tissue.
Enabled simultaneous measurement of blood flow velocity.
Successfully distinguished RBC signals from background tissue signals.

Conclusions:

The AIFM-based optical angiography is a promising label-free technique for live biological specimens.
This method offers high contrast and sensitivity for microvascular imaging.
Potential applications include studying physiological mechanisms of blood circulation in transparent organisms.