Real Time FPGA Resampling for Swept Source Optical Coherence Tomography

摘要

Real-time swept source OCT data is most often sampled using a specially cut hardware k-clock. The present invention involves mathematically resampling signals within an FPGA-based data acquisition board based on data sampled from a wide free spectral range reference interferometer. The FPGA can then multiply up the reference clock rate to achieve greater imaging depth. The Nyquist fold-over depth can thus be programmed from a standard reference to an arbitrary depth, much as PLL frequency synthesizer can produce many frequencies from a standard stable reference. The system is also capable of real-time performance.

主权项

1. A system for resampling an optical coherence tomography signal, the system comprising:
a frequency scanning light source for generating a swept optical signal; a k-clock module that generates a reference signal in response to frequency sweeping of the swept optical signal; an interferometer that generates interference signals from the swept optical signal; a data acquisition module (DAQ) configured to sample the reference signal at a constant rate and resample the reference signal at uniform optical frequency intervals; and a field programmable gate array (FPGA) configured to multiply the reference signal.