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題 名 | Feasibility of Low Tube Voltage for Comprehensive Cardiac Computed Tomography in Patients with a Normal Body Mass Index: Image Quality and Radiation Dose=低管電壓對於正常身體質量指數患者施行綜合性心臟電腦斷層掃描的可行性:圖像品質和輻射劑量評估 |
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作 者 | 李易濰; 葉漢根; 吳樹鏗; 李榮輝; 黃宗正; 李子瑜; 尤寶珠; 高常發; | 書刊名 | Journal of Radiological Science |
卷 期 | 36:1 2011.03[民100.03] |
頁 次 | 頁21-30 |
分類號 | 415.213 |
關鍵詞 | 心臟; 電腦斷層; 圖像品質; 輻射劑量; |
語 文 | 英文(English) |
英文摘要 | The purpose of this study was to compare the image quality and radiation dose between cardiac computed tomography (CCT) protocols using low tube voltage (100 kV) and conventional tube voltage (120 kV) with a wide ECG modulation pulsing window in patients with a normal body-mass-index (BMI). Fifty-two patients with a normal BMI (18-24 kg/m2) and coronary calcium score <400 Agatston units underwent retrospectively ECG-gated 64-slice CCT with an ECG pulsing window of 40-80% of the R-R interval. Twenty-six patients were assigned to the 100 kV group and the other twenty-six patients were assigned to the 120 kV group randomly. The image quality of the coronary arteries was assessed by a 4-point scale (1=non-diagnostic to 4=excellent). The effective radiation dose, image noise, mean CT-attenuation values, contrast-to-noise (CNR) and signal-tonoise (SNR) ratios were also evaluated. The 100 kV group and 120 kV group showed no significant differences with respect to image quality scores, CNR and SNR. Even with an average of 38.2% dose reduction, the image quality scores were excellent in 89.6% and good in 10.4% of the coronary segments in the 100 kV group. Interobserver agreement in evaluating image quality (κ= 0.91) was good. The 100 kV group had a significantly lower effective radiation dose (mean ± SD, 7.6 ± 0.7 vs 12.3 ± 1.5 mSv), higher image noise levels and mean CT-attenuation values than those of the 120 kV group. Although the image noise level was higher than that in the 120 kV group, the 100 kV protocol significantly reduced the radiation dose of CCT in patients with a normal BMI while its image quality scores, CNR, SNR were not significantly affected. |
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