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Optical Scatter Microscopy Based on Two-Dimensional Gabor Filters

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Published on: June 2, 2010

Clutter rejection filters for optical Doppler tomography.

Hongwu Ren, Xingde Li

|June 12, 2009

Summary

A new method called moving-scatterer-sensitive optical Doppler tomography (MSS-ODT) effectively removes clutter signals. This improves the accuracy of Doppler flow imaging, especially for small blood vessels.

Area of Science:

Biomedical Optics
Medical Imaging
Flowmetry

Background:

Optical Doppler tomography (ODT) uses phase-resolved (PR) methods to measure flow velocity.
A-line signals in ODT can be contaminated by clutter from stationary or slow-moving structures, impacting flow quantification accuracy.

Purpose of the Study:

To introduce a delay line filter (DLF) based method for clutter rejection in ODT.
To develop moving-scatterer-sensitive ODT (MSS-ODT) for enhanced Doppler flow imaging.
To improve the sensitivity and accuracy of ODT in visualizing blood flow.

Main Methods:

Theoretical analysis of the frequency response of different order DLFs.
Implementation of a first-order phase-shifted DLF for clutter rejection.
Experimental application of MSS-ODT using a real-time spectral-domain optical coherence tomography (SD-OCT) system.

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Main Results:

A first-order phase-shifted DLF effectively rejects clutter and enhances sensitivity to moving scatterers.
MSS-ODT demonstrates higher sensitivity to Doppler flow compared to conventional PR-ODT.
MSS-ODT provides more accurate vessel size determination and recovers small blood vessels masked by clutter.

Conclusions:

MSS-ODT significantly improves Doppler flow imaging by mitigating clutter effects.
The developed method enhances the visualization and quantification of blood flow, particularly in challenging scenarios.
MSS-ODT offers a valuable advancement for biomedical imaging of microcirculation.