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Proceedings Paper

Real-time digital design for an optical coherence tomography acquisition and processing system
Author(s): Tyler S. Ralston; Jose A. Mayen; Dan L. Marks; Stephen A. Boppart
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Paper Abstract

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 1M-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.

Paper Details

Date Published: 13 July 2004
PDF: 12 pages
Proc. SPIE 5324, Three-Dimensional and Multidimensional Microscopy: Image Acquisition and Processing XI, (13 July 2004); doi: 10.1117/12.527829
Show Author Affiliations
Tyler S. Ralston, Univ. of Illinois/Urbana-Champaign (United States)
Jose A. Mayen, Univ. of Illinois/Urbana-Champaign (United States)
Dan L. Marks, Univ. of Illinois/Urbana-Champaign (United States)
Stephen A. Boppart, Univ. of Illinois/Urbana-Champaign (United States)

Published in SPIE Proceedings Vol. 5324:
Three-Dimensional and Multidimensional Microscopy: Image Acquisition and Processing XI
Jose-Angel Conchello; Carol J. Cogswell; Tony Wilson, Editor(s)

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