目的 分析双时相三维稳态进动 快速成像序列(3D SSFP)对先天性心脏 (CHD)大血管畸形的诊断价值。方法 对 我院近两年(2015年12月-2017年12月)收 治的经超声诊断为CHD的46例患者先心病 患者在术前或术后均采用胸部双时相3D SSFP成像及传统对比剂增强磁共振血管成 像(CE-MRA)技术，比较两种MR检查获得的 先心病患者大血管图像质量及测得的大血 管直径，分析评估双时相3D SSFP成像技 术在先天性心脏(CHD大血管畸形中的诊断 效能。结果 两种MR检查获得的先心病患 者大血管图像质量无显著差异(P>0.05)； 3D SSFP收缩期、舒张期及CE-MRA测得的 主动脉、左肺动脉、右肺动脉直径差异显 著(P<0.05)，肺总动脉及下腔静脉直径无 显著差异(P>0.05)，3D SSFP收缩期测得 的主动脉、肺总动脉、右肺动脉直径显著 大于舒张期(P<0.05)，左肺动脉及下腔静 脉直径与舒张期无显著差异(P>0.05)。结 论 3D SSFP成像技术能清晰显示先天性心 脏病患者的大血管形态变化，且能准确测 量不同心动时期大血管直径，有助于临床 制定合理的治疗方案，提高CHD患者的治 疗效果。

Objective To analyze the diagnostic value of dual-phase three-dimensional steady-state precession (3D SSFP) in large vessels malformations of congenital heart disease(CHD). Methods A total of 46 cases of patients with congenital heart disease (CHD) diagnosed by ultrasound in our hospital in the past two years (December 2015 to December 2017) were treated with chest dual-phase 3D SSFP imaging and traditional contrast enhanced magnetic resonance angiography (CE-MRA) technique before or after surgery. The large vessels image quality and measured large vessels diameters of CHD patients were compared between the two MR examinations, and the diagnostic efficacy of dual-phase 3D SSFP imaging in large vessels malformations of CHD was analyzed and evaluated. Results There was no significant difference in the large vessels image quality in CHD patients between the two MR examinations (P>0.05). There were significant differences in the diameters of aorta, left pulmonary artery and right pulmonary artery measured by 3D SSFP in systolic phase and diastolic phase and CE-MRA (P<0.05), and there was no significant difference in the diameters of common pulmonary artery and inferior vena cava (P>0.05). The diameters of aorta, common pulmonary artery and right pulmonary artery measured by 3D SSFP in systolic phase were significantly larger than those in diastolic phase (P<0.05), and there was no significant difference in the diameter of left pulmonary artery and inferior vena cava compared with those in diastolic phase (P>0.05). Conclusion 3D SSFP imaging can be used to the diagnosis of large vessels morphology of patients with congenital heart disease, and can measure the diameters of large vessels in different cardiac phases accurately, and it helps to develop a reasonable treatment regimen and improve the treatment effects of CHD patients.