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題 名 | 冠狀動脈電腦斷層檢查使用自動曝光系統在320列電腦斷層儀輻射劑量及影像品質的評估=The Evaluation of Radiation Dose and Image Quality in 320-Detector Row Computed Tomography of the Coronary Arteries Using an Automatic Exposure Control System |
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作 者 | 劉名宏; 林恬敏; 王永成; 侯貴圓; | 書刊名 | 中華放射線技術學雜誌 |
卷 期 | 41:2 2017.06[民106.06] |
頁 次 | 頁75-80 |
分類號 | 416.14 |
關鍵詞 | 冠狀動脈電腦斷層攝影; 輻射劑量; 自動曝光系統; 影像品質; Coronary computed tomography angiography; CCTA; Radiation dose; Automatic exposure control system; AECs; Image quality; |
語 文 | 中文(Chinese) |
中文摘要 | 冠狀動脈電腦斷層攝影(coronary computed tomography angiography, CCTA)已成為臨床診斷冠狀動脈之重要方式之一,其具備有非侵入性、高解析度及三維空間影像等優點,但檢查時患者接受的輻射劑量仍是受關注的議題。本研究的目的為利用320列電腦斷層掃描機,針對以自動曝光系統(automatic exposure control system, AECs)調整管電流以及依照身體質量指數(body mass index, BMI)調整管電流方式,比較兩者之輻射劑量及影像品質。本研究自2012年1月至2015年1月共收錄200位研究對象。所有研究對象分為A組與B組。A組的管電流是依BMI使用固定的電流數值,B組則利用自動曝光系統決定管電流數值。輻射曝露值及劑量則以劑量長度乘積(dose length product, DLP)及有效劑量評估,影像品質評估則分析左冠狀動脈幹和右冠狀動脈開口位置軸位像的訊號雜訊比(signal-to-noise ratio, SNR)及對比度雜訊比(contrast-to-noise ratio, CNR)。研究結果發現B組與A組相比,有效管電流與劑量長度乘積可分別顯著降低29.4%和29.5%,顯示有統計意義(p<0.05)。A組與B組條件下所獲得的訊號雜訊比,左冠狀動脈幹為21.4 ± 5.7和23.1 ± 6.0(p= 0.044),右冠狀動脈則為19.2 ± 5.2以及22.3 ± 5.7(p= 0.000);然而,左冠狀動脈幹之對比度雜訊比為25.9 ± 6.7和27.2 ± 6.6(p= 0.156),右冠狀動脈則為23.3 ± 6.3與26.4 ± 6.4(p= 0.001)。由本次研究結果可知,使用320列電腦斷層掃描機執行冠狀動脈檢查時,可使用自動曝光系統以降低病患的輻射劑量,並獲得較佳的影像品質。 |
英文摘要 | Coronary computed tomography angiography (CCTA) has been one of the most important methods in diagnosis of coronary artery disease. It is a non-invasive imaging examination with high spatial resolution and three-dimensional fashion but remains concerned about patient's radiation dose. The purpose of the study was to compare the radiation dose and image quality of CCTA by using two tube current modulations, one was dependent on automatic exposure control system (AECs) and the other one was dependent on body mass index (BMI), in 320-raw multi-detector computed tomography (320-MDCT). Two hundred subjects received CCTA were retrospectively recruited and divided into 2 groups (Group A: by BMI; Group B: by AECs) in this study. Subject' radiation exposure and doses were evaluated by DLP and effective dose, while image quality was assessed according the signal-to-noise ratio (SNR) and contrast-to-noise ratio (CNR) at the origin of left coronary artery and right coronary artery in axial view. For group comparison, group B showed significant lower dose length (DLP) product than Group A (136.4±63.7 mGy.cm vs. 193.3±53.0 mGy.cm; p=0.000) and significant increased SNR and CNR than Group A from left coronary artery (23.1±6.0 vs. 21.4±5.7; p=0.044 and 27.2±6.6 vs. 25.9±6.7; p=0.156) and from right coronary artery (22.3±5.7 vs. 19.2±5.2; p=0.000 and 26.4±6.4 vs. 23.3±6.3; p=0.001). In conclusion, AECs is useful to reduce radiation dose and increase image quality in 320-MDCT. |
本系統中英文摘要資訊取自各篇刊載內容。