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Objective To assess the diameters of pulmonary veins in order to provide the standard criterion for imaging diagnosis by Dual-Source CT.Methods 100 patients without pulmonary vein diseases underwent Dual-Source CT from July 1, 2009 to September 10, 2009 were enrolled, 71 male and 29 female, average age was 62.37 years.Contrast-enhanced CT was performed to acquire the diameters of the four major pulmonary veins from axial, coronal and sagittal images and the data was assessed by two experienced radiologist with more than four years experience of radiology, SPSS 13.0 were used for statistical analyses.Results Average sizes in diameters ofRSPV ostia were (1.50±0.26) cm, (1.70±0.26) cm, (3.28±1.36)cm, respectively in the axial, coronal and sagittal images, the RIPV (1.32±0.22) cm, (1.59±0.23) cm,(1.53±0.26) cm; the RSPV (1.37±0.24) cm, (1.77±0.28) cm, (1.43±0.35) cm, and the RSPV (1.04±0.21)cm, (1.47±0.26) cm, (1.27±0.34) cm.Conclusion Dual-source CT can provide the standard criterion for imaging diagnosis for the diameters of pulmonary veins, it is a accuracy and non-traumatic approach to demonstrate the pulmonary veins, therefore it can provide diagnostic information for the catheter ablation to atrial fibrillation.