Optimizing cardiac MR imaging: Practical remedies for artifacts
Optimizing cardiac MR imaging: Practical remedies for artifacts
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DOI：
10.1148/rg.284065718
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发表时间：
2008-07-01
期刊：
影响因子：
5.5
通讯作者：
Kim, Raymond J.
中科院分区：
文献类型：
--
作者：
Saremi, Farhood;Grizzard, John D.;Kim, Raymond J.
随着磁共振（MR）成像技术的不断进步，对心脏MR评价的临床需求不断增加。心脏磁共振成像技术已从传统的自旋回波序列发展到屏气扰相梯度回波和平衡稳态自由旋进序列。最新开发的技术可用于评价心肌功能、灌注和存活率;冠状动脉造影;血流定量;和标准形态学评估。然而，即使使用最复杂的采集技术，伪影也通常发生在心脏MR成像中。了解这些伪影的起源、影像学表现和意义对于避免将其误解为真正的病变至关重要。一些伪影是由患者、线圈或心电图导联定位的简单错误、附近电子设备的射频干扰或磁场内的金属物体引起的。其他则与特定的MR成像序列或技术直接相关。用于缩短心脏评估中的采集和屏气时间的加速成像技术（如并行成像）特别容易受到伪影的影响。如果伪影严重降低图像质量，则应通过适当调整重复采集，以减少或消除问题。(C)RSNA，2008年。
With ongoing technical advances in magnetic resonance (MR) imaging, the clinical demand for cardiac MR evaluations has been increasing. Cardiac MR imaging techniques have evolved from traditional spin-echo sequences to breath-hold spoiled gradient-echo and balanced steady-state free precession sequences. The most recently developed techniques allow evaluation of myocardial function, perfusion, and viability; coronary angiography; flow quantification; and standard morphologic assessments. However, even with the most sophisticated acquisition techniques, artifacts commonly occur at cardiac MR imaging. Knowledge of the origin, imaging appearance, and significance of these artifacts is essential to avoid misinterpreting them as true lesions. Some artifacts are caused by simple errors in positioning of the patient, coil, or electrocardiographic leads; radiofrequency interference from nearby electronic equipment; or metallic objects within the magnetic field. Others are directly related to a specific MR imaging sequence or technique. Accelerated imaging techniques such as parallel imaging, which are used to shorten acquisition and breath-hold times in cardiac evaluations, are particularly vulnerable to artifacts. If an artifact severely degrades image quality, the acquisition should be repeated with appropriate adjustments to decrease or eliminate the problem. (C) RSNA, 2008.