High speed, wide velocity dynamic range Doppler optical coherence tomography (Part I): System design, signal processing, and performance
| Autor: | Brian C. Wilson, Stuart Lo, I. Alex Vitkin, Victor X. D. Yang, Bing Qi, Maggie L. Gordon, Julius Pekar, Emily Seng-Yue, Alvin Mok |
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| Předmět: |
Physics
Flow visualization Signal processing medicine.diagnostic_test business.industry Image processing Laser Doppler velocimetry Atomic and Molecular Physics and Optics symbols.namesake Optics Optical coherence tomography medicine symbols Acoustic Doppler velocimetry Optical Doppler Tomography business Doppler effect |
| Zdroj: | ResearcherID Scopus-Elsevier |
| Popis: | Improvements in real-time Doppler optical coherence tomography (DOCT), acquiring up to 32 frames per second at 250 x 512 pixels per image, are reported using signal processing techniques commonly employed in Doppler ultrasound imaging. The ability to measure a wide range of flow velocities, ranging from less than 20 microm/s to more than 10 cm/s, is demonstrated using an 1.3 microm DOCT system with flow phantoms in steady and pulsatile flow conditions. Based on full implementation of a coherent demodulator, four different modes of flow visualization are demonstrated: color Doppler, velocity variance, Doppler spectrum, and power Doppler. The performance of the former two, which are computationally suitable for real-time imaging, are analyzed in detail under various signal-to-noise and frame-rate conditions. The results serve as a guideline for choosing appropriate imaging parameters for detecting in vivo blood flow. |
| Databáze: | OpenAIRE |
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