查詢結果分析
相關文獻
- 使用低劑量輻射執行心臟冠狀動脈電腦斷層鈣化分析可行性評估
- 鈷六十治療機除役處置及人員劑量評估
- 輻射劑量合理抑低措施之執行
- Low-dose Three-dimensional CT of Paranasal Sinuses
- 鈷六十治療機輻射安全劑量評估
- 應用光激發光劑量計於640切電腦斷層頭部檢查陪檢者輻射劑量之評估
- Reduction of Patient's Medical Scattering Radiation Doses Using Aluminum Material Filters
- The Effect of Appropriately Reducing the Dose of Nuclear Medicine on the Quality of Image Uptake
- Assessment of the Quality of Radiographic Imaging in Computed Radiography Image
- 心導管放射醫學診療之皮膚劑量評估--假體研究
頁籤選單縮合
題 名 | 使用低劑量輻射執行心臟冠狀動脈電腦斷層鈣化分析可行性評估=Evaluation of Coronary Artery Calcium Score Using Lower dose CT Scan |
---|---|
作 者 | 葉志盛; 蔡惠予; 呂嘉偉; 胡威志; 洪建福; | 書刊名 | 中華放射線技術學雜誌 |
卷 期 | 35:3 2011.09[民100.09] |
頁 次 | 頁142-146 |
分類號 | 416.262 |
關鍵詞 | 較低輻射劑量; 心臟冠狀動脈電腦斷層鈣化分析; 合理抑低; Lower dose; Coronary artery calcium score; As low as reasonable allowable; |
語 文 | 中文(Chinese) |
中文摘要 | 現行心臟冠狀動脈鈣化分析使用人為圈選與電腦分析,設定300mA的管電流,會對受檢者貢獻約2.5mSv的等效劑量,基於合理抑低(ALARA)的原則,本試驗利用64列電腦斷層掃描儀與較低的管電流(200mA, 100mA)執行檢查,評估較低輻射劑量在分析影像時,對人為圈選及電腦分析結果的影響。選定30歲以上,患有腎臟病、糖尿病或週邊動脈阻塞症需執行電腦斷層檢查的受檢者,使用TOSHIBA Aquilion 64多切層電腦斷層掃描儀設定120kVp、300mA、0.25s配合心電圖誘發執行一次心臟冠狀動脈電腦斷層鈣化檢查後,隨機分配使用200mA或100mA的管電流再執行一次檢查,經工作站分析所得影像,得到各二組的鈣化指數與鈣化總量,並可以再進一步轉換成為日後罹患冠心症危險度值,以Paired samples t-test及Rank Correlation分析各組結果值的差異。對於受試者的體型相關數值使用Independent samples t-test分析,以確定二組受試者可以進行交互比較,結果為p值大於0.05。對於不同輻射劑量,Paired samples t-test的p值大於0.05而Rank Correlation 的Spearman's coefficient = 0.946及significance level的p值也小於0.05。由本試驗族群所得的結果顯示使用不同輻射劑量進行鈣化分析的結果是相似的,但是會因為雜訊而增加圈選分析區域時的錯誤率。 |
英文摘要 | Coronary calcium scoring is based on manually selecting the region of interest (ROI) and computer analysis by setting a 300 mA-tube current, which results in an equivalent dose of 2.5mSv. Based on the principle of as low as reasonable allowable, this research uses a 64-detector CT scanner with lower tube current (200 mA, 100 mA) to evaluate the impact of lower dose on the results of coronary calcium scoring analysis with regards to ROI and computer analysis. Patients over the age of 30 with diabetes mellitus, renal disease and peripheral arterial occlusive disease whom underwent CT examination were the target candidates for research. In this study TOSHIBA Aquilion 64 MDCT using EKG-triggered, 120 kVp, 300 mA, and exposure time 0.25 s was used to obtain the coronary calcium score. Thereafter, study subjects were randomly assigned for repeated scan using 200 mA or 100 mA tube current. The acquired images were transferred to a workstation for further post-processing and analysis. First, the calcium score and total calcification mass from the two data sets were calculated by commercial software. Thereafter, the future risk of cardiovascular disease of each subject was calculated. Paired samples t-test and rank correlation test were used to analyze the differences amongst these two groups. For different body sizes of subjects, the results were evaluated by independent samples t-test to ensure these results are comparable (p > 0.05). For the different radiation doses used in this study, the results showed that there was no significant difference (p < 0.05) in the calcification analysis using rank correlation test (spearman’s coefficient = 0.946). Based on the study results, we concluded that using different radiation doses to evaluate the calcification condition in coronary arteries would have similar results. The increased noise with lower radiation imaging parameters resulted in more errors in defining the ROI. |
本系統中英文摘要資訊取自各篇刊載內容。