(1)To prospectively evaluate the effect of heart rate, heart rate variability, and calcification dual-source computed tomography (CT) image quality and to prospectively assess diagnostic accuracy of dual-source CT for coronary artery stenosis. by using invasive coronary angiography as the reference standard.
前瞻性评价心率、心率变异性及钙化双源计算机断层扫描成像质量的影响及对冠状动脉狭窄的双源性冠状动脉狭窄诊断的准确性评价。以侵入性冠状动脉造影为参照标准。
(2)Chest radiography plays an essential role in the diagnosis of thoracic disease and is the most frequently performed radiologic examination in the United States. Since the discovery of X rays more than a century ago, advances in technology have yieled numerous improvements in thoracic imaging. Evolutionary progress in film-based imaging has led to the development of excellent screen-film systems specifically designed for chest radiography.
胸部X线摄影中起着至关重要的作用在胸部疾病的诊断，是最常用的影像学检查在美国。由于发现X射线的一个多世纪前，技术的进步得到了大量的改进，在胸部影像。电影为基础的成像的进化进展，导致了专门设计用于胸部放射摄影的优秀的屏幕膜系统的发展。
(3)although mammography is quite sensitive for the detection of breast cancer morphologic criteria that are mammographically visible are frequently insufficient for the differentiation of benign from malignant lesions.Performance of needle aspiration and needle localization procedures followed by excisional biopsy is frequently necessary to determine the origin of a mammographic finding.
虽然摄影是乳腺癌的形态学标准，乳房可见检测相当敏感，经常不足的恶性病变良性分化性能。穿刺针定位切除活检程序经常需要确定一个X线发现的起源
(4)Therefore,initiatives have been taken among radiation protection authorities to give priority to investigations of dose levels and frequencies of X-ray examinations among children. The main objective is to establish recommendation of upper dose limits for various diagnostic procedures and to implement minimum requirements for equipment standards.
因此，在辐射防护当局之间采取了主动行动，优先考虑儿童的剂量水平和频率的调查。主要目标是建立各种诊断程序的上限的建议，并实施设备标准的最低要求。
(5)Thus, the aim of our study was to prospectively evaluate to what extent image quality in 16-detector row CT coronary angiography is a function of the heart rate and image reconstruction technique.
因此，我们的研究的目的是前瞻性评估在何种程度上的图像质量在16检测器行冠状动脉造影是一个功能的心脏速率和图像重建技术。
(6)The aim of our study was to prospectively evaluate the effect of heart rate, heart rate variability, and calcification on dual-source CT image quality and to prospectively assess the diagnostic accuracy of dual-source CT for coronary artery stenosis , by using invasive coronary
angiography as the reference standard.
本研究的目的是前瞻性评估心脏心率、心率变异性和钙化对双源的图像质量的影响，并前瞻性评估冠状动脉狭窄的双源断层扫描的诊断准确率，通过使用侵入性冠状动脉血管造影作为参考标准。
(7)The purpose of this study was to compare observer performance for the detection of urinary system calculi using computed radiographs with different display formats and different viewing systems.
本研究的目的是比较的观察员性能检测泌尿系统结石的CT片有不同的显示格式和不同观测系统。
(8)CT studies were performed with a dual-source scanner in all patients and were performed without complications.Prior to acquisition of the topogram, patients received a single dose of 2.5mg of idodine. .
CT检查与所有患者双源扫描仪进行，无并发症。对像收购之前，患者接受单剂量2.5mg的碘。
(10)The degree of correlation between multi-detector row CT coronary angiography and invasive coronary angiography in grading of coronary atherosclerosis was investigated with Spearman correlation analysis. The symmetry of data distribution and any underestimation or overestimation with multi-detector row CT coronary angiography were checked with the Bowker test.
多排螺旋CT冠状动脉造影和冠状动脉造影冠状动脉评分之间的相关程度进行Spearman相关分析研究。数据分布和任何低估或高估与多排CT冠状动脉成像的对称性与对称性检查。
(11)The quality of the images obtained with the digital flat-panel detector system was rated significantly superior to the quality of those obtained with the conventional film-screen radiography system .
与数字的平板探测器系统获得的图像的质量被评为显着优于那些获得与传统的电影屏幕摄影系统的质量。
(12)In conclusion , our results indicate that in 16-row detector cardiac CT, image quality critically depends on the choice of a suited reconstruction interval and reconstruction technique. In patients with a high heart rate, the best image quality is observed in end systole and early diastole ; in patients with a lower heart rate, the best image quality is observed in middiastole.
总之，我们的研究结果表明，在16排探测器心脏断层，图像质量的关键取决于一个合适的重建间隔和重建技术的选择。在患者的高心率、图像质量最好的是在收缩末期和舒张早期观察；患者心率较低，图像质量最好的是观察舒张中期。
