Real-time digital design for an optical coherence tomography acquisition and processing system

被引：2
作者：
Ralston, TS [1 ]
Mayen, JA [1 ]
Marks, D [1 ]
Boppart, SA [1 ]
机构：
[1] Univ Illinois, Beckman Inst Adv Sci & Technol, Urbana, IL 61801 USA
来源：
THREE-DIMENSIONAL AND MULTIDIMENSIONAL MICROSCOPY: IMAGE ACQUISITION AND PROCESSING XI | 2004年 / 5卷 / 13期
关键词：
digital signal processing; optical coherence tomography; Doppler; spectroscopic; real-time;
D O I：
10.1117/12.527829
中图分类号：
TH742 [显微镜];
学科分类号：
摘要：
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.
引用
收藏
页码：159 / 170
页数：12
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