Wintersperger Bernd J, Runge Val M, Biswas Jonmenjoy, Nelson C Brett, Stemmer Alto, Simonetta Alexander B, Reiser Maximilian F, Naul L G, Schoenberg Stefan O
Department of Clinical Radiology, University Hospitals-Grosshadern, Ludwig-Maximilians-University, Munich, Germany.
Invest Radiol. 2006 Jul;41(7):586-92. doi: 10.1097/01.rli.0000223742.35655.24.
We sought to evaluate Periodically Rotated Overlapping ParallEL Lines with Enhanced Reconstruction (PROPELLER; BLADE) data acquisition in comparison with standard k-space sampling techniques for axial and sagittal brain imaging at 3 T regarding imaging artifacts.
Forty patients who gave consent were included in a prospective comparison of standard and PROPELLER (BLADE) k-space sampling techniques. All examinations were performed at 3 T with comparison of standard T2-weighted fluid-attenuated inversion recovery (FLAIR) to PROPELLER T2-weighted FLAIR in the axial image orientation and standard T1-weighted gradient echo to PROPELLER T1-weighted FLAIR in the sagittal image orientation. Imaging protocols were matched for spatial resolution, with data evaluation performed by 2 experienced neuroradiologists. Image data were compared regarding various image artifacts and overall image quality. Reader agreement was assessed by Cohen's kappa statistics.
PROPELLER T2-weighted axial data acquisition showed significantly less pulsation and Gibb's artifacts than the standard T2-weighted scan. Even without motion correction, the frequency of ghosting (motion) artifacts was substantially lower in the PROPELLER T2-weighted data and readers concordantly (kappa = 1) rated PROPELLER as better than or equal to the standard T2-weighted scan in the majority of cases (95%; P < 0.0001). In the comparison of sagittal T1-weighted data sets, readers showed only fair agreement (kappa = 0.24) and noted consistent wrap artifacts in PROPELLER T1-weighted FLAIR.
PROPELLER (BLADE) brain magnetic resonance imaging is also applicable at 3 T. In addition to minimizing motion artifacts, the PROPELLER acquisition scheme reduces other magnetic resonance artifacts that would otherwise degrade scan quality.
我们试图评估采用周期性旋转重叠平行线增强重建（PROPELLER；BLADE）数据采集技术与标准k空间采样技术相比，在3T场强下进行轴向和矢状位脑成像时的成像伪影情况。
40名同意参与的患者被纳入标准与PROPELLER（BLADE）k空间采样技术的前瞻性对比研究。所有检查均在3T场强下进行，轴向图像方向上比较标准T2加权液体衰减反转恢复（FLAIR）序列与PROPELLER T2加权FLAIR序列，矢状图像方向上比较标准T1加权梯度回波序列与PROPELLER T1加权FLAIR序列。成像方案在空间分辨率方面进行了匹配，由2名经验丰富的神经放射科医生进行数据评估。比较图像数据的各种图像伪影和整体图像质量。通过科恩kappa统计量评估阅片者的一致性。
与标准T2加权扫描相比，PROPELLER T2加权轴向数据采集显示出明显更少的搏动伪影和吉布斯伪影。即使不进行运动校正，PROPELLER T2加权数据中的鬼影（运动）伪影频率也显著更低，阅片者一致（kappa = 1）认为在大多数情况下（95%；P < 0.0001）PROPELLER优于或等同于标准T2加权扫描。在矢状位T1加权数据集的比较中，阅片者仅表现出一般的一致性（kappa = 0.24），并指出PROPELLER T1加权FLAIR序列中存在一致的卷褶伪影。
PROPELLER（BLADE）脑磁共振成像在3T场强下也适用。除了最大限度减少运动伪影外，PROPELLER采集方案还能减少其他会降低扫描质量的磁共振伪影。
