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題 名 | 研究水和脂肪在磁振梯度回波影像的共振偏離效應=A Study of Off-Resonance Effects for Water and Fat Tissues on Magnetic Resonance Gradient-Echo Brain Images |
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作 者 | 王明燕; 高怡宣; 郭萬祐; 黃榮貴; 郭伯舒; 陳婷儀; | 書刊名 | 中華放射線技術學雜誌 |
卷 期 | 33:1 2009.06[民98.06] |
頁 次 | 頁46-50 |
分類號 | 414.93 |
關鍵詞 | 共振偏移效應; 梯度回波; 相位變化; 磁振影像; 曲線擬合法; 獨立成分分析法; 脂肪成分; 水成分; Off-resonance effect; Gradient-echo; Phase modulation; Brain magnetic resonance imaging; Curve fitting method; Independent component analysis method; Water component; Fat component; |
語 文 | 中文(Chinese) |
中文摘要 | 人體腦部的組織主要是由脂肪和含有水成分的灰質、白質、血液所構成的,由於脂肪和水的化學環境不同,軌道電子產生的磁場,使核子間所感受到的磁場大小不同,因而產生了共振偏移效應。脂肪和水成分會隨著不同的回波時間,產生同相與反相的訊號變化現象。若將兩者的訊號分離,將可以減少彼此在磁振影像上的訊號干擾,增加臨床診斷價值。本實驗的主要目的,是利用磁振梯度回波脈衝序列,研究腦部磁振影像中脂肪與水成分相位變化,同時獲取脂肪與水的成份影像,和弛緩時間影像。在這個實驗中,分別取得假體和正常受試者的腦部磁振影像,利用曲線擬合及獨立成份分析法進行影像分析。本研究的結果顯示,這兩種分析方法所分離的脂肪與水成分影像,具有相當的一致性。而且結果的影像中,水與脂肪的位置,與原始影像中的成份分佈位置相當的符合。 |
英文摘要 | Human brain tissues consist of fat and water containing tissues, e.g. white matter, gray matter and blood. Because of the different chemical environments between water and fat, the electrons create magnetic fields that alter the local field felt by the nucleus. The difference in the resonance frequency results in an off-resonance effect and the in-out phase phenomena of signal intensity for water and fat are observed on gradient-echo images with different echo times. To isolate the fat and water signal will reduce the confounded interference from each other and thus provide an improved accuracy in clinical diagnosis. The purpose of this research is to study the phase modulation between water and fat components in brain magnetic resonance imaging. Gradient-echo magnetic resonance images were acquired from phantoms and volunteers. We utilized a curve fitting method and independent component analysis to investigate the off-resonance effect. The locations of water and fat components in result images correspond to the distribution of original images well. |
本系統中英文摘要資訊取自各篇刊載內容。