研究生: |
黃梓瑋 |
---|---|
論文名稱: |
低溫接收線圈應用於低磁場核磁共振系統之改良與特性研究 The Research of Receive and Improvement Coil in Low Temperature by Using Low-Field NMR System |
指導教授: |
楊鴻昌
Yang, Hong-Chang 洪姮娥 Horng, Herng-Er |
學位類別: |
碩士 Master |
系所名稱: |
光電工程研究所 Graduate Institute of Electro-Optical Engineering |
論文出版年: | 2014 |
畢業學年度: | 102 |
語文別: | 中文 |
論文頁數: | 59 |
中文關鍵詞: | 低磁場 、低溫 、可攜帶式 |
論文種類: | 學術論文 |
相關次數: | 點閱:95 下載:0 |
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本研究架設一個杜瓦瓶冷卻系統,將接收線圈放入杜瓦瓶中的真空夾層中。當液態氮灌入杜瓦瓶時,可透過杜瓦瓶內的藍寶石管,使真空夾層內的接收線圈降溫,以降低接收線圈的熱雜訊,進而提升樣品核磁共振的訊雜比。在本實驗中,應用本系統可使線圈熱雜訊降低四分之ㄧ,有效提高核磁共振實驗的訊雜比。
為了將低場核磁共振研究拓展至臨床應用,在台大醫院架設了一套核磁共振系統,以期能進行臨床實驗。但由於醫院的電磁雜訊極大,會干擾本系統的工作,因此利用碳纖維布包覆訊號線來屏蔽雜訊,降低醫院中環境雜訊的干擾。此外並應用3個方向的梯度磁場補償環境磁場的不均勻情形,使得系統可穩定在台大醫院進行樣品檢測。透過上述的改進方式,初步測量5 毫升的水樣品,可使線寬從10.74 Hz降至1.3 Hz,並大幅提升訊雜比由10.42提升至24.1。未來將進一步應用於生物組織檢體之臨床檢測。
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