摘要
目的：探讨螺旋桨（periodically rotated overlapping parallel lines with enhanced reconstruction,PROPELLER）技术在降低上腹部各种伪影及提高图像质量中的作用。方法：2012年6月至2013年1月间97例拟作上腹部3.0T MRI扫描的患者纳入本研究（年龄19~76岁,平均年龄53.8岁）,常规FSE T2WI序列与PROPELLER FSE T2WI序列的扫描参数一致。2位读片医师对图像的呼吸运动伪影,胃肠管蠕动伪影,血管搏动伪影,肝、胰腺边缘的锐利度进行3等级的评分。等级数据资料的对比采用Wilcoxon’s秩和检验;读片医师之间判断结果一致性用Cohen’s Kappa检验评估。结果：常规FSE T2WI与PROPELLER FSE T2WI相比,后者降低了呼吸运动伪影,胃肠蠕动伪影,血管搏动伪影,增加肝、胰腺边缘锐利度,2者间差异均有统计学意义（Z值分别为-5.931、-6.245、-6.481、-6.164、-5.745,P值均〈0.05）;2位读片医师对上述指标的判断一致性上,结果显示为均在中等及以上一致;PROPELLER FSE T2WI的扫描时间较FSE T2WI减少5～15 s。结论：与常规FSE序列相比,PROPELLER技术能够显著降低呼吸运动、胃肠蠕动、血管搏动等运动伪影,增加了解剖细节的显示,提高了图像诊断质量。
Objective：To evaluate the effectiveness of periodically rotated overlapping parallel lines with enhanced reconstruction （PROPELLER） technique in reducing motion artifact and improving image quality on FSE T2WI image. Methods：Ninety-seven patients with a mean age of 53.8 years（age range, 19-76 years） were underwent upper abdominal examination with 3.0T MRI. The samescanning parameters were used on axial T2-weighted PRO- PELLER sequence and FSE sequence. The respiratory artifacts, gastrointestinal movement artifacts, pulsatility artifacts, overall image quality, and the edge of the liver, pancreas were evaluated by two radiologists using a 3-point scale. The Wilcoxon＇s rank sum test was used for statistical analysis. The Cohen＇s Kappa test was used to determine the agreement between two radiolo- gists. Results ： On T2-weighted PROPELLER images, the respiratory artifacts, gastrointestinal movement artifacts, vascular pulsatility artifact were reduced and the overall image quality, sharpness of the liver,pancreas and renal corticomedullary junction area were improved （Z=-5.931, -6.245, -6.481, -6.164, -5.745 ; P〈0.05）. The agreement between two radiologists is consistent. Conclusions ： Compared those of with FSE T2WI sequence, the respiratory artifacts, gastrointestinal movement artifacts,vascular pulsatility artifacts are significantly reduced on PROPELLER T2WI sequence. PROPELLER T2WI can better display the anatomic structure,improve the image quality and shorten the scanning time.
出处
《重庆医科大学学报》
CAS
CSCD
北大核心
2014年第2期257-261,共5页
Journal of Chongqing Medical University
基金
国家自然科学基金资助项目(编号:30970803)
滨州医学院科技计划资助项目(编号:BY2011KJ041)
关键词
磁共振成像
螺旋桨技术
图像伪影
magnetic resonance imaging
periodically rotated overlapping parallel lines with enhanced reconstruction （PROPELLER）
image artifacts
