Free-breathing pediatric MRI with nonrigid motion correction and acceleration
Free-breathing pediatric MRI with nonrigid motion correction and acceleration
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DOI：
10.1002/jmri.24785
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发表时间：
2015-08-01
影响因子：
4.4
通讯作者：
Vasanawala, Shreyas S.
中科院分区：
文献类型：
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作者：
Cheng, Joseph Y.;Zhang, Tao;Vasanawala, Shreyas S.
PurposeTo开发和评估运动校正技术的高分辨率小儿腹部容积磁共振图像采集自由呼吸与高扫描efficiency.Materials和MethodsFirst，变密度采样和径向相位编码排序被纳入三维笛卡尔收购。其次，使用内置多通道蝶形导航仪测量呼吸运动。最后，这些估计适用于运动加权的数据一致性在压缩感知和并行成像重建，并使用本地化的自动聚焦框架的非刚性运动校正。在获得机构审查委员会批准和知情同意/同意后，对22例连续儿科患者进行了研究。两名放射科医生独立地对图像的整体图像质量、运动伪影程度以及肝血管和横膈膜的清晰度进行评分。采用配对Wilcoxon检验和加权Kappa系数对结果进行评估，以确定观察者间的一致性。
PurposeTo develop and assess motion correction techniques for high-resolution pediatric abdominal volumetric magnetic resonance images acquired free-breathing with high scan efficiency.Materials and MethodsFirst, variable-density sampling and radial-like phase-encode ordering were incorporated into the 3D Cartesian acquisition. Second, intrinsic multichannel butterfly navigators were used to measure respiratory motion. Lastly, these estimates are applied for both motion-weighted data-consistency in a compressed sensing and parallel imaging reconstruction, and for nonrigid motion correction using a localized autofocusing framework. With Institutional Review Board approval and informed consent/assent, studies were performed on 22 consecutive pediatric patients. Two radiologists independently scored the images for overall image quality, degree of motion artifacts, and sharpness of hepatic vessels and the diaphragm. The results were assessed using paired Wilcoxon test and weighted kappa coefficient for interobserver agreements.ResultsThe complete procedure yielded significantly better overall image quality (mean score of 4.7 out of 5) when compared to using no correction (mean score of 3.4, P