Spectral filtering of k-clock signal in OCT system and method
AssigneeAxsun Technologies, Inc.
InventorsBrian Goldberg, Bartley C. Johnson
Life of this patent
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Abstract
A system and method for spectral filtering of a k-clock signal in a swept-source Optical Coherence Tomography (“OCT”) system to remove artifacts in the k-clock signal. The system synchronizes sampling of the k-clock and interference signals generated from scanning a sample. Using a filtered k-clock signal, the system resamples an interference dataset of the interference signals. The system then performs Fourier transform based processing upon the resampled interference dataset to yield axial depth images of the sample. The system preferably performs the reconstruction, resampling, and associated Fourier-Domain signal processing in software via a Field Programmable Gate Array (“FPGA”) of a rendering system.
Claims20
An optical coherence analysis system, comprising:
- an optical swept source system that generates a swept optical signal;
- a k-clock module that generates k-clock signals in response to frequency sweeping of the swept optical signal;
- an interferometer that generates interference signals from the swept optical signal;
- a data acquisition system that samples the k-clock signals and the interference signals to generate a k-clock dataset and an interference dataset;
- and
- a rendering system that spectrally filters the k-clock dataset into a reconstructed k-clock dataset, and resamples the interference dataset into a linearized interference dataset in response to the reconstructed k-clock dataset.
An optical coherence analysis method, comprising:
- generating a swept optical signal;
- generating k-clock signals in response to frequency sweeping of the swept optical signal;
- generating interference signals from the swept optical signal;
- sampling the k-clock signals and the interference signals to generate a k-clock dataset and an interference dataset;
- and
- spectrally filtering the k-clock dataset into a reconstructed k-clock dataset, and the resampling the interference dataset into a linearized interference dataset in response to the reconstructed k-clock dataset.
Dependencies are inferred from the claim text.