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将多普勒探测与正弦相位调制复频域光学相干层析成像技术(OCT)相结合,建立了基于正弦相位调制的全深度频域多普勒光学相干层析成像系统。利用正弦相位调制B-M扫描方法,并采用傅里叶变换结合带通滤波的方法重建复干涉谱信号,获得全深度层析及多普勒图像。成像深度范围扩大为原来的2倍,在整幅图像范围内均可获得较高的速度探测灵敏度。基于该系统获得了血流仿体的全深度层析图及全深度多普勒图。实验测量的系统最小可探测速度为5.35μm/s。
A Doppler optical coherence tomography system based on sinusoidal phase modulation was established by combining Doppler detection with sinusoidal phase modulation complex frequency domain optical coherence tomography (OCT). The sinusoidal phase-modulated B-M scanning method was used to reconstruct the complex interference signal using Fourier transform and band-pass filtering to obtain full-depth tomography and Doppler images. The imaging depth range is doubled to provide high speed detection sensitivity over the entire image range. Based on this system, the full-depth chromatograms of blood flow body and full depth Doppler images were obtained. The experimentally measured system minimum detectable velocity is 5.35μm / s.