光聲影像顯微術之研究

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姓名

李中華(Chung-hua Li) 查詢紙本館藏

畢業系所

光電科學與工程學系

論文名稱

光聲影像顯微術之研究
(Study of photoacoustic imaging microscopy)

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摘要(中)

光聲成像系統同時擁有光學影像和超音波影像的優點，其能夠及時成像及高對比度、高解析度和非侵入式等優點，光聲效應利用物體對光波長的選擇性吸收，及利用超音波的高穿透性來接收訊號，超音波成像雖然有高穿透的特性，其利用聲音在遇到不同介質時的反射波來判斷物體的結構，但遇到人體上較多軟組織時，超音波探測器將會難以接收到反射聲波，導致對比度下降影像無法分辨物體，且超音波成像的解析度與聲波波長有關，波長太長也會造成相鄰物質無法分辨，影響影像解析度及真實性，而光聲成像利用物體選擇性吸收的高差異性來製作影像，造成影像的高對比性，且擁有光學影像的高解析度及超音波影像的低散射性。
本研究的光聲成像系統使用波長為1064 nm的Q-switch雷射激發物體，能夠讓吸收體在短時間內吸收高能量，以利偵測光聲訊號，及使用Galvo system控制雷射光路掃描物體得到到影像，另外本研究還將雷射光導入光學顯微鏡，整合光學顯微鏡同時得到光學影像及光聲影像，且顯微物鏡也提供給本光聲成像系統高解析度。

摘要(英)

Photoacoustic imaging systems have the advantages of both optical imaging and ultrasonic imaging. It is capable of doing real-time imaging noninvasive, while at the same time providing both high contrast and high resolution images. Photoacoustic effect uses the high transmittances of ultrasonic waves and the fact that materials absorb different wavelengths of light to obtain the signal.
The basic principle of ultrasonic imaging is when a wave goes from one medium to another, part of the wave will be reflected, and can be used to restructure the shape of the object. Ultrasonic waves can go really deep inside the human body, but the contrast inside soft tissues aren’t really good and would be difficult to distinguish the difference of it. The resolution of ultrasonic imaging is also related to the wavelength of the ultrasonic wave, wavelengths that are too long will result in a lower resolution image, and would be difficult to distinguish objects close to each other. However, photoacoustic imaging uses the highly different light absorption of materials to obtain high contrast images, and has the high resolution characteristic of optical imaging and the low scattering property of ultrasonic imaging
The photoacoustic imaging system used in our system contains basically a Q-switch laser with central wavelength of 1064 nm, a galvo system and an optical microscope. Using the Q-switch laser will allow the sample to absorb lots of energy in a short period of time, and will thereby enhance the photoacoustic signal we detect when the sample is excited. The galvo system allows us to control the laser light path, so that we can scan the sample and get photoacoustic image. Finally, by guiding the laser into the optical microscope, both the optical image and the photoacoustic image can be obtained at the same time. Moreover, the objective lens inside the microscope will also provide high resolution to the photoacoustic system.

關鍵字(中)

★ 光聲
★ 顯微術
★ 光聲成像

關鍵字(英)

★ Photoacoustics
★ microscopy
★ Photoacoustic imaging

論文目次

中文摘要 ii
Abstract iii
致謝 v
目錄 vii
圖目錄 x
第一章序論 1
1.1 前言 1
1.2 動機 3
1.3 應用 4
1.4 論文架構 5
第二章理論基礎 6
2.1 光聲原理 6
2.1.1 光聲訊號產生 6
2.1.2 初始光聲訊號 7
2.1.3 光聲波方程式 9
2.1.4 光聲波方程式的解 11
2.1.5 球型物體的脈衝激發 13
2.2 光聲成像 16
2.3 線性系統 19
2.3.1 線性和疊加 19
2.3.2 轉換函數 21
2.3.3 交叉相關 23
第三章光聲成像架構 26
3.1 光學成像架構 26
3.2 樣品 31
3.2.1 碳纖維 31
3.2.2 鉻薄膜樣品 32
3.2.3 解析度測試片 33
3.3 實驗步驟 35
3.4 訊號處理 37
第四章實驗結果 39
4.1 光聲訊號 39
4.2 靈敏度 41
4.2.1 碳纖維的光聲訊號 41
4.2.2 鉻的光聲訊號 44
4.3 解析度 47
4.3.1 平面解析度 47
4.3.2 深度解析度 57
4.4 平面的光聲影像 61
4.5 三維圖形 63
第五章討論與未來展望 70
5.1 結論 70
5.2 未來展望 71
參考文獻 72

參考文獻

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指導教授

鍾德元(Te-yuan Chung)

審核日期

2013-8-29

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