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科技與工程學院
光電工程研究所
學位論文
學位論文
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http://rportal.lib.ntnu.edu.tw/handle/20.500.12235/73896
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search.filters.author.Lai,Jui-Tse
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search.filters.author.賴瑞澤
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search.filters.subject.低場磁振造影
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search.filters.subject.弛緩率
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search.filters.subject.磁流體
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search.filters.subject.預先極化技術
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磁性奈米粒子顯影劑在低場核磁共振中增強T1權重造影特性研究
(
2015
)
賴瑞澤
;
Lai,Jui-Tse
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磁性奈米粒子溶液又稱為磁流體,在高場核磁共振系統常被當作T2顯影劑。磁流體為超順磁顯影劑,相較於其他顯影劑,具有較好的生物相容性。而在過去的研究指出低磁場磁振造影下T1對比效果可被增強,因此期望應用低場磁振造影系統並與傳統高場磁振造影系統,探討磁性奈米粒子顯影劑在高場與低場下的對比效應。為此本研究使用並改進自製的低場核磁共振系統以及7T核磁共振系統,量測不同濃度磁流體的T1及T2弛緩時間,以得到高場以及低場的弛緩率R1及R2。驗證磁流體在高、低場下的T1與T2對比效果。並透過磁振造影影像強度,驗證了磁流體在低場的T1權重造影對比度比高場佳;而含鐵量高的磁流體T2權重造影在高場對比度比低場佳;含鐵量低的磁流體T2權重造影在低場對比度比高場佳。確立磁流體在低場磁振造影下,僅需較低劑量即能有良好的對比效益。故能降低劑量以及成本,且能減少因劑量而產生的副作用風險,具有臨床應用的潛力。
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