We sought to compare the diagnostic value of multi-slice computed tomography(MSCT)coronary angiography(CA)to detect significant stenoses(< 50%lumen diameter reduction)-with that of invasive CA. The latest 16-row MS...We sought to compare the diagnostic value of multi-slice computed tomography(MSCT)coronary angiography(CA)to detect significant stenoses(< 50%lumen diameter reduction)-with that of invasive CA. The latest 16-row MSCT scanner has a faster rotation time(375 ms)and permits scanning with a higher X-ray tube current(500 to 600 mA)during MSCT CA when compared with previous scanners. We studied 51 patients(37 men, mean age 58.9±10.0 years)with stable angina or atypical chest pain. Patients with pre-scan heart rates < 70 beats/min received oral beta-blockade. The heart was scanned after intravenous injection of 100 ml contrast(iodine content, 400 mg/ml). Mean scan time was 18.9±1.0 s. The MSCT scans were analyzed by two observers unaware of the results of invasive angiography, and all available coronary branches< 2 mm were included. Invasive CA demonstrated normal arteries in 16%(8 of 51), non-significant disease in 21%(11 of 51), single-vessel disease in 37%(19 of 51), and multivessel disease in 26%(13 of 51)of patients. There were 64 significant lesions. Sensitivity, specificity, and positive and negative predictive values for detection of significant lesions on a segment-based analysis were 95%(61 of 64, 95%confidence interval [CI] 86 to 99), 98%(537 of 546, 95%CI 96 to 99), 87%(61 of 70, 95%CI 76 to 98), and 99%(537 of 540, 95%CI 98 to 99), respectively. All patients with angiographically normal coronary arteries or significant lesions were correctly identified. Three of 11 patients with < 50%lesions were incorrectly classified as having single-vessel disease. The 16-row MSCT CA reliably detects significant coronary stenoses in patients with atypical chest pain or stable angina pectoris.展开更多
目的比较用Z轴调制自动管电流调节技术（ATCM）行胸部螺旋CT检查时不同噪声指数（NI）条件下的成像效果和辐射剂量。方法选择100例肺结核复查患者,随机分为A、B、C、D组,每组25例。用Z轴调制自动管电流调节技术行胸部螺旋CT检查,自动管...目的比较用Z轴调制自动管电流调节技术（ATCM）行胸部螺旋CT检查时不同噪声指数（NI）条件下的成像效果和辐射剂量。方法选择100例肺结核复查患者,随机分为A、B、C、D组,每组25例。用Z轴调制自动管电流调节技术行胸部螺旋CT检查,自动管电流强度70~300 m A。A组NI为标准值11.58,B、C、D组NI分别为13、15、19,其余扫描参数相同。比较各组肺尖及中、下肺部肺窗和纵膈窗图像质量评分。比较各组受检者接受的CT剂量指数（CTDIvol）、剂量长度乘积（DLP）,计算有效剂量（ED）。结果 ①成像质量：A、B、C、D组受检者图像质量评分均高于4分。肺尖及中、下肺部肺窗和纵膈窗图像质量评分A、B、C组差异无统计学意义,D组低于A、B、C组,P均〈0.05。②辐射剂量：A、B组CTDIvol、DLP、ED比较差异均无统计学意义;展开更多
文摘We sought to compare the diagnostic value of multi-slice computed tomography(MSCT)coronary angiography(CA)to detect significant stenoses(< 50%lumen diameter reduction)-with that of invasive CA. The latest 16-row MSCT scanner has a faster rotation time(375 ms)and permits scanning with a higher X-ray tube current(500 to 600 mA)during MSCT CA when compared with previous scanners. We studied 51 patients(37 men, mean age 58.9±10.0 years)with stable angina or atypical chest pain. Patients with pre-scan heart rates < 70 beats/min received oral beta-blockade. The heart was scanned after intravenous injection of 100 ml contrast(iodine content, 400 mg/ml). Mean scan time was 18.9±1.0 s. The MSCT scans were analyzed by two observers unaware of the results of invasive angiography, and all available coronary branches< 2 mm were included. Invasive CA demonstrated normal arteries in 16%(8 of 51), non-significant disease in 21%(11 of 51), single-vessel disease in 37%(19 of 51), and multivessel disease in 26%(13 of 51)of patients. There were 64 significant lesions. Sensitivity, specificity, and positive and negative predictive values for detection of significant lesions on a segment-based analysis were 95%(61 of 64, 95%confidence interval [CI] 86 to 99), 98%(537 of 546, 95%CI 96 to 99), 87%(61 of 70, 95%CI 76 to 98), and 99%(537 of 540, 95%CI 98 to 99), respectively. All patients with angiographically normal coronary arteries or significant lesions were correctly identified. Three of 11 patients with < 50%lesions were incorrectly classified as having single-vessel disease. The 16-row MSCT CA reliably detects significant coronary stenoses in patients with atypical chest pain or stable angina pectoris.
文摘目的比较用Z轴调制自动管电流调节技术（ATCM）行胸部螺旋CT检查时不同噪声指数（NI）条件下的成像效果和辐射剂量。方法选择100例肺结核复查患者,随机分为A、B、C、D组,每组25例。用Z轴调制自动管电流调节技术行胸部螺旋CT检查,自动管电流强度70~300 m A。A组NI为标准值11.58,B、C、D组NI分别为13、15、19,其余扫描参数相同。比较各组肺尖及中、下肺部肺窗和纵膈窗图像质量评分。比较各组受检者接受的CT剂量指数（CTDIvol）、剂量长度乘积（DLP）,计算有效剂量（ED）。结果 ①成像质量：A、B、C、D组受检者图像质量评分均高于4分。肺尖及中、下肺部肺窗和纵膈窗图像质量评分A、B、C组差异无统计学意义,D组低于A、B、C组,P均〈0.05。②辐射剂量：A、B组CTDIvol、DLP、ED比较差异均无统计学意义;
