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頁籤選單縮合
題 名 | CT Angiography for Detecting Intracranial Occlusive Arterial Disease: Various Parameters=電腦斷層血管成像術以發現顱內動脈阻塞疾病:影響品質之各項因子 |
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作 者 | 鄧木火; 劉致康; 凌憬峰; 羅兆寶; 陳行素; 郭萬祐; 姜仁惠; 張政彥; 楊建芳; | 書刊名 | 中華放射線醫學雜誌 |
卷 期 | 23:4 1998.08[民87.08] |
頁 次 | 頁137-141 |
分類號 | 414.93 |
關鍵詞 | 電腦斷層; 血管攝影; 螺旋; 技術; Computed tomography; CT; Angiography; Helical; Technology; |
語 文 | 英文(English) |
中文摘要 | 為了使電腦斷層血管成像術之各項因子均調好,以使成為發現顱內動脈阻塞疾病之有用的診斷工具。我們使用互相交叉成十字形的二修細管,內充以1%之Telebrix-38以為電腦斷層血管成像術之動脈模子。我們修改下列因子而做了多次之電腦斷層血管成像術:切片厚度(1∼3mm),pitch(1∼3),重組間距(0.1∼1mm),我們以SSD及MIP二種方法重組。在幾乎平行於原始資料收集平面之動脈可見不規則之邊緣及帶狀之低密度(部份體積效應及梯形假影)。這些在pitch較高和切片厚度較大時較明顯。但這些變化如果以垂直於資料收集之平面觀察則看不到。在垂直於資料收集平面走向之血管則沒有這種現象。在診斷動脈硬化及血管栓塞而使用電腦斷層血管成像術時,部份體積效應及梯形假影是不可忽視的。為減少此二種效應,pitch要低,切片要薄。ch要低,切片要薄。 |
英文摘要 | To optimize parameters of computed tomographic angiography (CTA) and to make it a useful tool for detecting intracranial occlusive vascular disease. Two connecting tubes filled with 1% Telebrix-38 in normal saline were used as a model vessel for CTA. Multiple CTA's were performed after changing the following parameters: slice thickness (collimation, 1-3 mm), pitch (1-3), and reconstruction spacing (0.1-1mm). Zigzag margin and artifacts of bands of low density (partial volume and stairstpe artifact) were found on the vessel model nearly horizontal to the data collection plane (axial). There bands were more obvious at higher pitches and wider collimation. They were not seen on the model vessel vertical to the data collection plane. They were less obvious on the superior view of the vessel model. The effects of partial volume and stairstep artifact have to be considered when using caliber changes in CTA in the diagnosis of thrombosis or arteriosclerosis. To reduce these effects, the pitch should be low, and the collimation should be narrow. on should be narrow. |
本系統中英文摘要資訊取自各篇刊載內容。