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題名 | Study on Deconvolution Algorithms for Optical Coherent Tomography=以逆捲積法處理光學同調斷層攝影術影像之研究 |
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作者 | 詹益鑑; 邱志軒; 田恩光; 詹國禎; Jan, I-chien; Chiu, Chih-hsiung; Tien, En-kwung; Jan, Gwo-jen; |
期刊 | Journal of Medical and Biological Engineering |
出版日期 | 20030600 |
卷期 | 23:2 2003.06[民92.06] |
頁次 | 頁73-78 |
分類號 | 336.9 |
語文 | eng |
關鍵詞 | 光學同調斷層攝影術; 點擴散函數; 逆捲積演算法; Optical coherence tomography; OCT; Point spread function; Deconvolution algorithm; |
中文摘要 | 光學同調斷層攝影術(Optical Coherence Tomography)是近年來發展出來新的生物醫學影像系統,它的非侵入式斷層影像可以達到十多微米的縱向解析力,適合探測微小的組織結構。然而,光學同調斷層攝影術系統的縱向解析力,是由光源的波長及頻寬來決定的。從光學的同調特性中,可寫出一線性偏移不變的數學模型,此模型是捲積的形式,可以從中定義光學同調斷層攝影術系統的縱向解析力。本研究獲得OCT縱向的點擴散函數,並經由限制性疊代還原逆捲積演算法,在雙蓋玻片仿體中,成功地加強了影像邊緣的銳利度,提昇系統的縱向解析力。此外,本研究使用另一種演算法,NAS-RIF盲目逆捲積演算法,不使用點擴散函數而解出原始影像,在洋蔥影像上的表現較限制性疊代還原演算法更佳,最後並針對兩種演算法做討論與比較。 |
英文摘要 | Optical Coherence Tomography (OCT) is a novel tool for biomedical imaging in recent years. The noninvasive cross-section images have longitudinal resolution of a few micrometers, which is applicable to detect small organizations and structures, and the resolution is limited by the wavelength and spectrum bandwidth of the light source. Based on an interferometric OCT and following the coherence theory, a linear shift invariant system model describing coherent light specimen interactions in OCT is presented. In this study, the axial point spread function (PSF) is obtained, and the image of a double-cover-glass phantom was restored and enhanced the image sharpness by using the constrained iterative restoration (CIR) algorithm. Another deconvolution method, non-negativity and support constraints recursive inverse filtering (NAS-RIF) blind deconvolution algorithm, is also used in this study. In onion image, restored by using NAS-RIF algorithm, shows better quality than using iterative algorithm. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。