Article

Frequency tracking in optical Doppler tomography using an adaptive notch filter.

University of Connecticut, Electrical and Computer Engineering Department, Storrs, Connecticut 06269, USA.
Journal of Biomedical Optics (impact factor: 3.16). 12(1):014018. DOI:10.1117/1.2710240 pp.014018
Source: PubMed

ABSTRACT Optical Doppler tomography is a valuable functional extension of optical coherence tomography (OCT) that can be used to study subsurface blood flows of biological tissues. We propose a novel frequency estimation technique that uses an adaptive notch filter (ANF) to track the depth-resolved Doppler frequency. This new technique is a minimal-parameter filter and works in the time domain without the need of Fourier transformation. Therefore, the algorithm has a computationally efficient structure that may be well suited for implementation in real-time ODT systems. Our simulations and imaging results also demonstrate that this filter has good performance in terms of noise robustness and estimation accuracy compared with existing estimation algorithms.

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Keywords

algorithm
 
ANF
 
computationally efficient structure
 
depth-resolved Doppler frequency
 
estimation accuracy
 
estimation algorithms
 
Fourier transformation
 
imaging results
 
novel frequency estimation technique
 
optical coherence tomography
 
Optical Doppler tomography
 
real-time ODT systems
 
study subsurface blood flows
 
time domain
 
valuable functional extension