We present a real-time, multi-dimensional, digital, optical coherence tomography (OCT) acquisition and imaging system. The system consists of conventional OCT optics, a rapid scanning optical delay (RSOD) line to support fast data acquisition rates, and a high-speed A/D converter for sampling the interference waveforms. A IM-gate Virtex-II field programmable gate array (FPGA) is designed to perform digital down conversion. This is analogous to demodulating and low-pass filtering the continuous time signal. The system creates in-phase and quadrature-phase components using a tunable quadrature mixer. Multistage polyphase finite impulse response (FIR) filtering and down sampling is used to remove unneeded high frequencies. A floating-point digital signal processor (DSP) computes the magnitude and phase shifts. The data is read by a host machine and displayed on screen at real-time rates commensurate with the data acquisition rate. This system offers flexible acquisition and processing parameters for a wide range of multi-dimensional optical microscopy techniques.

Original languageEnglish (US)
Article number31
Pages (from-to)159-170
Number of pages12
JournalProgress in Biomedical Optics and Imaging - Proceedings of SPIE
Issue number13
StatePublished - 2004
EventThree-Dimensional and Multidimensional Microscopy: Image Acquisition and Processing XI - San Jose, CA, United States
Duration: Jan 27 2004Jan 29 2004


  • Digital signal processing
  • Doppler
  • Optical coherence tomography
  • Real-time
  • Spectroscopic

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Radiology Nuclear Medicine and imaging
  • Biomaterials


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