Steady-state free precession projection MRI as a potential alternative to the conventional chest X-ray in pediatric patients with suspected pneumonia
Steady-state free precession projection MRI as a potential alternative to the conventional chest X-ray in pediatric patients with suspected pneumonia
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DOI：
10.1007/s00330-002-1404-4
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发表时间：
2002-11-01
影响因子：
5.9
通讯作者：
Wagner, M
中科院分区：
文献类型：
--
作者：
Rupprecht, T;Böwing, B;Wagner, M
由于物理上的限制，尤其是低质子密度、敏感性和运动伪影，肺组织的磁共振成像被认为是几乎不可能的。我们研究的目的是评估和完善一种在低场强下非常快速的MR技术，以克服MR肺部成像的局限性。对30例小儿疑似肺炎患者进行了35次调查。在低场磁共振系统中，在没有心脏或呼吸触发的情况下，在冠状层定向上进行磁共振检查。采用了一种优化的、稳定进动序列的真快速成像方法。对mri影像及相应的常规胸片进行评价。每片检查时间为1.6 s。没有观察到运动伪影。肺实质的信噪比在4.9 ~ 7.1之间，所有胸部x线影像的病理表现均被MRI正确识别（kappa=0.82 ~ 0.85）。与x线检查相比，MRI检查更准确地检测到积液和小的肺浸润（kappa=0.82）。低场投影MRI是一种很有前途的替代小儿胸部x线。由于其检查时间短，克服了常规MRI方法的物理限制，并提供了可比的诊断信息。
Magnetic resonance imaging of the lung tissue is thought to be hardly possible due to physical limitations especially the low proton density, susceptibility, and motion artifacts. The objective of our study was to evaluate and refine a very fast MR technique at a low field strength which overcomes the limitations in MR lung imaging. Thirty-five investigations were performed in 30 pediatric patients with suspected pneumonia. The MR investigations were performed in coronal slice orientation without cardiac or respiratory triggering in a low-field MR system. An optimized true fast imaging with steady precession sequence was applied. The MR images and the corresponding conventional chest radiographs were evaluated. The examination time per slice was 1.6 s. No motion artifacts could be observed. The signal-to-noise ratio for pulmonary parenchyma ranged from 4.9 to 7.1, All pathological findings of the chest X-ray images were correctly identified by the MRI (kappa=0.82-0.85). Effusions as well as small pneumonic infiltrates were more precisely detected by the MRI investigation (kappa=0.82) as compared with X-ray. Low-field projection MRI is a promising alternative to pediatric chest X-ray. Due to its short examination time, it overcomes the physical limits of usual MRI methods and provides comparable diagnostic information.