研究生: |
賴彥良 Yen-Lian Lai |
---|---|
論文名稱: |
改進Mirau全域式光學同調斷層掃描儀之Mirau干涉儀 The improvement of Mirau interferometer for the Mirau0based full-field optical coherence tomography |
指導教授: |
葉秉惠
Ping-Hui Yeh |
口試委員: |
徐世祥
Shih-Hsiang Hsu 黃升龍 Sheng-Lung Huang |
學位類別: |
碩士 Master |
系所名稱: |
電資學院 - 電子工程系 Department of Electronic and Computer Engineering |
論文出版年: | 2018 |
畢業學年度: | 106 |
語文別: | 中文 |
論文頁數: | 102 |
中文關鍵詞: | 光學同調斷層掃描 |
外文關鍵詞: | OCT |
相關次數: | 點閱:248 下載:3 |
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本文中使用實驗室生長的摻鉻鎂橄欖石晶體光纖以 520nm 綠光雷射泵浦產生放大自發輻射(Amplified spontaneous emission; ASE)作為Mirau-based 全域式光學同調斷層掃瞄系統所使用的光源,共使用兩顆 1-W 520nm 之雷射二極體泵浦摻鉻鎂橄欖石晶體光纖,對於沿 C 軸方向生長的摻鉻鎂橄欖石晶體光纖可以產生 1.4 mW ASE,中心波長 900 nm、頻寬 250 nm,可以使 OCT 系統上在活體組織中有 1.18 μm的縱向解析度能力;沿 B 軸方向生長的摻鉻鎂橄欖石晶體光纖可以產生3mW ASE,中心波長 900 nm、頻寬 200 nm,可使OCT 系統搭配 40X 物鏡下得到0.98μm 的橫向解析度能力,1.2 μm的縱向解析度能力。
皮膚切片是臨床上用來判斷皮膚疾病的準則,在皮膚切片上有分成鑽取活組織檢查(Punch biopsy)、活削活組織檢查(Shave biospy)、切口活組織檢查(Incisional biopsy),皮膚切片檢查是屬於侵入式的檢測方式,這樣子的檢測方式會讓病患傷口流血並且可能留下疤痕,光學同調斷層掃描術(Optical coherence tomography; OCT)在生醫影像中佔有很重要的地位,其在量測時不需要特別做標記,能夠以非侵入的方式量出樣本3D立體影像結構。
本論文中針對Mirau干涉儀部分進行改良,藉由改變鍍膜設計,使得干涉效率由7.64%大幅上升至22.35%,可有效提升訊噪比(Signal noise ratio, SNR)與影像品質。
In this thesis, Cr:forsterite crystal fiber amplified spontaneous emission(ASE) light source was used to build a Mirau-based full-field optical coherence tomography system using two 520-nm laser diode to pump the different axis Cr:forsterite crystal fiber. The C-axis fiber can generate 3-mW ASE light centered at 900 nm with a bandwidth of 250 nm was generated. The B-axis fiber generated ASE light centered at 900nm with a bandwidth of 200um. The mirau-based full-firld OCT has an axial resolution of 1.2um and a lateral resolution of 0.98um.
Skin biopsy is the gold standard for doctor to diagnosis skin cancers. There are several ways to do the skin biopsy such as punch biopsy, shave biopsy, incisional biopsy, incisional biopsy. These methods are all invasive that make the patient bleed and leave scar. Optical coherence tomography is one of the techniques in the biomedical imaging system. It is a noninvasive, label-free and 3D imaging method.
In this system, we can acquire in-vivo skin image and get high-resolution 3D volume structure.
In this thesis, we especially improve the design of our Mirau device to make interference efficiency increase from 7.64% to 22.35% and effective increase the noise signal ratio and obviously improve the quality of image.
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