頻域光學延遲線於光學同調斷層顯像系統之研究

Abstract

中文摘要 光學同調斷層攝影術(OCT)為一種利用低同調干涉術的原理，可用來量測生物組織非接觸式的斷層影像，而functional OCT為近年來其中一支OCT的發展趨勢，其是利用取得干涉訊號的相位資訊，使得除了可以得到一般OCT影像之外，還可以得知待測物的各種特性，如血流速度參數、雙折射參數與相位變化參數…等。因此本研究設計以FD-ODL調制技術搭配馬赫-詹德干涉儀與平衡式偵測的光路架構以獲取OCT光強度訊號大小與相位資訊，初步實驗結果証實使用FD-ODL做為OCT系統中調變光程差具有相速度和群速度的延遲是相互獨立的、掃描速率快、掃描線性度佳、色散影響小與掃描工作距離範圍長…等特性。

Abstract Optical coherence tomography (OCT), based on low coherence interferometry, is a powerful tool that can support non-contact and high-speed tomographic imaging in biological tissues. Moreover, several functional OCT (f-OCT), based on phase-resolved techniques, are proposed recently that can image and quantify physiological parameters including blood flow, birefringence, or spatial phase variation. Therefore, in this research, we developed a balanced OCT system to yield structural image and phase information by incorporating the frequency-domain optical delay line (FD-ODL) into a Mach-Zehnder interferometer. Several distinctive properties of such FD-ODL, including the decoupling of the phase and group delay, high-speed and high-repetition linear scanning, and the control of dispersion, have been confirmed by our experimental results.