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頁籤選單縮合
題 名 | Magnetic Resonance Spectroscopy in Epilepsy=癲癇之磁振頻譜 |
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作 者 | 許元昱; | 書刊名 | 中華放射線醫學雜誌 |
卷 期 | 27:4 2002.08[民91.08] |
頁 次 | 頁141-149 |
分類號 | 415.932 |
關鍵詞 | 腦; 癲癇; 磁振頻譜; Brain; Epilepsy; Magnetic resonance spectroscopy; |
語 文 | 英文(English) |
中文摘要 | 磁振頻譜(magnetic resonance spectroscopy)不具侵襲性,並且可以測量人體腦部的代謝物,其基本原理與磁振造影相同。磁振頻譜的測量結果,一般是以半定量的代謝物比率或定量的代謝物強度來表示。不同的測量技術、測量條件和測量區域,都會影響頻譜的表現而改變檢測的結果。因此,為了使磁振頻譜的測量有可重覆性,並且能做長期追蹤的比較,保持固定一致的測量方式是非常重要的。在判讀或比較磁振頻譜的數據時,一定要考量不同檢測條件可能造成的影響。近年來,利用磁振頻譜研究癲癇病患有日漸增多的趨勢,尤其是顳葉癲癇。磁振頻譜能測量腦部高能階磷酸鹽的含量;但是其信號:雜訊比低,空間解析度差,而且在一般臨床磁振系統無法進行。而質子磁振頻譜則可和一般的磁振造影在同一次檢查中進行,同時提供解剖影像以及生化數據。質子磁振頻譜可在顳葉癲癇病人的內側顳葉或海馬迴側得N-乙醯天門冬胺酸(N-acetylaspartate)減少的現象。表示病灶處有神經元喪失或功能不良的情形。質子磁振頻譜已廣泛應用於許多有關顳葉癲癇的研究領域,包括手術前的病灶定位,癲癇發作前後代謝狀態的改變,預測手術的結果,治療造成的代謝改變,以及與其他不同類型癲癇之間的差異。雖然磁振頻譜目前仍被視為研究工具,但是諸多文獻報告顯示磁振頻譜當有助於無人對癲癇之瞭解與治療。 |
英文摘要 | Magnetic resonance spectroscopy (MRS) can detect in vivo cerebral metabolites non-invasively. Principles underlying MRS are basically the same as those of magnetic resonance imaging (MRI). The results of MRS measurement are always presented in terms of semi-quantitative ratios or quantitative intensities of metabolites. Technique differences, parameter inconsistency and regional variations will influence the spectral profiles and significantly change the results. Therefore, it is very important to keep the sequences and parameters used for spectral acquisition consistent in order to make the measure-ments reproducible and longitudinal studies compa-rable. The effects of different acquisition techniques and parameters must be considered when interpre-tation or comparison of MRS data is made. In vivo MRS is increasingly used for clinical study in seizure patients, especially in those with temporal lobe epilepsy. Phosphorus MRS can detect the levels of high-energy phosphates in the brain, but has the disadvantages of low signal-to-noise ratio, poor spa-tial resolution and unavailability on clinical MR sys-tems. Proton MRS can be performed together with MRI during the same examination session, pro-viding biochemical data in addition to structural information. Reduced intensity of N-acetylaspartate on proton spectra is consistently identified in the mesial temporal lobe or hippocampus of patients with temporal lobe epilepsy, reflecting underlying neuronal loss or dysfunction. Pre-surgical lateraliza-tion, post-ictal metabolite changes, prediction of sur-gical outcome, post-treatment features, and differ-ences between temporal and extra-temporal epilepsy are under intensive investigation using in vivo proton MRS. Despite being regarded as a research imaging modality for patient evaluation, proton MRS has the promising potential to be helpful in seizure management. |
本系統中英文摘要資訊取自各篇刊載內容。