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題名 | 比較3.0T和1.5T腦動靜脈畸形之低劑量對比劑顯影三維飛行時間磁振血管造影=Comparison of the Low-dose Contrast-enhanced 3D Time of Flight Magnetic Resonance Angiography of Brain Arteriovenous Malformations at 3.0T and 1.5T Scanner |
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作者 | 余孝勤; 謝長其; 林育駿; 秦嗣騏; 黃浩輝; 衛優遊; 陳耀亮; Yu, Hsiao-ching; Shieh, Charng-chyi; Lin, Yu-chun; Chin, Shy-chyi; Wong, Ho-fai; Wai, Yau-yau; Chen, Yao-liang; |
期刊 | 中華放射線技術學雜誌 |
出版日期 | 20110900 |
卷期 | 35:3 2011.09[民100.09] |
頁次 | 頁147-153 |
分類號 | 414.93 |
語文 | chi |
關鍵詞 | 三維飛行時間磁振血管造影; 腦動靜脈畸形; 低劑量對比顯影三維飛行時間磁振血管造影; 3D TOF MRA; Brain arteriovenous malformations; Low-dose contrast-enhanced 3D TOF MRA; |
中文摘要 | 目的為比較腦動靜脈畸形患者之三維飛行時間磁振血管造影在未加施打和施打低劑量顯影劑兩者於1.5T和3.0T掃描儀中訊雜比和對比雜訊比的差異,探討3.0T低劑量對比顯影三維飛行時間磁振血管造影合併平行取像技術在腦動靜脈畸形的臨床優勢和應用價值。回溯分析於2008年12月至2010年7月期間,8名以血管攝影檢查確診罹患腦動靜脈畸形患者,且同時接受未加施打和施打低劑量顯影劑之三維飛行時間磁振血管造影的9組檢查。定量分析以量測6組1.5T及3組3.0T原始影像之C4部位內頸動脈及靜脈竇的訊號並計算其訊雜比和對比雜訊比,定性分析則以5級分評估最大強度投影影像。結果3.0T在血液訊雜比和對比雜訊比及遠端血管可見度均優於1.5T,同時施打低劑量顯影劑之動脈量測值均較未加施打者為小而靜脈竇則反之,兩者皆具有統計上之顯著差異(p<0.05)。最大強度投影方面,施打低劑量可以改善腦動靜脈畸形引流靜脈及遠端血管分枝之可見度,但供血動脈可能因此被遮蔽。總而言之,對於病徵位在威立氏環中央或近端分枝處,傳統三維飛行時間磁振血管造影為最佳技術,然而施打低劑量則較適合評估遠端分枝之病兆。 |
英文摘要 | To evaluate the clinical values of low-dose contrast-enhanced (LDCE) 3D time-of-flight (TOF) magnetic resonance angiography (MRA) with integrated parallel acquisition techniques for patients with brain arteriovenous malformations (BAVMs) by comparing the signal-to-noise ratios (SNRs) and contrast-to-noise ratios (CNRs) with non contrast-enhanced (NCE) MRA using a 1.5T and a 3.0T MR scanners. Nine sets of LDCE and NCE MRAs from eight patients with BAVMs angiographically admitted in our institute were retrospectively reviewed from Jun 2008 to July 2010. Images were analyzed quantitatively by calculating SNRs and CNRs of C4 segments of internal carotid artery and transverse sinus. The qualitative evaluations were performed by assessing maximum intensity projection (MIP) images manually using a 5-point scale. The results showed that the overall image quality of intracranial 3D TOFMRA at 3.0T were better than in 1.5T. For both scanners, the SNRs and CNRs of arteries in LDCE MRA were found lower while veins were higher significantly when compared with those in NCE MRA. The LDCE MRA improved the visualization of the venous system and distal arterial branches. However, the feeding arteries of BAVMs were thus occasionally obscured by those dilated and enhanced veins on MIP images of LDCE MRA. In conclusion, NCE TOF MRA is superior for visualizing lesions in central and proximal portions of circle-of-Wills while the LDCE is advocated in the evaluation of distal branches lesions. |
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