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 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 language | English (US) |
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Article number | 31 |
Pages (from-to) | 159-170 |
Number of pages | 12 |
Journal | Progress in Biomedical Optics and Imaging - Proceedings of SPIE |
Volume | 5 |
Issue number | 13 |
DOIs | |
State | Published - 2004 |
Event | Three-Dimensional and Multidimensional Microscopy: Image Acquisition and Processing XI - San Jose, CA, United States Duration: Jan 27 2004 → Jan 29 2004 |
Keywords
- 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