title: Frequency tracking in optical Doppler tomography using an adaptive notch filter.
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.
authors.affiliation: University of Connecticut, Electrical and Computer Engineering Department, Storrs, Connecticut 06269, USA.
authors.forename: Yueli
authors.initials: Y
authors.lastname: Chen
authors.forename: Peter
authors.initials: P
authors.lastname: Willett
authors.forename: Quing
authors.initials: Q
authors.lastname: Zhu
mesh_terms: D000465:Algorithms; D001783:Blood Flow Velocity / Q000502:physiology*; D003199:Computer Systems; D007089:Image Enhancement / Q000379:methods*; D007090:Image Interpretation, Computer-Assisted / Q000379:methods*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D012815:Signal Processing, Computer-Assisted; D041622:Tomography, Optical / Q000379:methods*; D018608:Ultrasonography, Doppler / Q000379:methods*