FPGA-Based Real-Time Swept-Source OCT Systems for B-Scan Live-Streaming or Volumetric Imaging

摘要

We have developed a Swept-Source Optical Coherence Tomography (Ss-Oct) system with high-speed, real-time signal processing on a commercially available Data-Acquisition (Daq) board with a Field-Programmable Gate Array (Fpga). The Ss-Oct system simultaneously acquires Oct and &-clock reference signals at 500 MS/s. From the fc-clock signal of each A-scan we extract a remap vector for the A;-space linearization of the Oct signal. The linear but oversampled interpolation is followed by a 2048-point Fft, additional auxiliary computations, and a data transfer to a host computer for real-time, live-streaming of B-scan or volumetric C-scan Oct visualization. We achieve a 100 kHz A-scan rate by parallelization of our hardware algorithms, which run on standard and affordable, commercially available Daq boards. Our main development tool for signal analysis as well as for hardware synthesis is Matlab® with add-on toolboxes and 3rd-party tools.