Vargas M I, Delavelle J, Kohler R, Becker C D, Lovblad K
Division of Neuroradiology, Department of Radiology, Geneva University Hospital, 24, road Micheli-du-Crest, 1211 Geneva 14, Switzerland.
J Neuroradiol. 2009 May;36(2):74-81. doi: 10.1016/j.neurad.2008.08.001. Epub 2008 Oct 5.
We illustrate here the most common MRI artifacts found on routine 3T clinical neuroradiology that can simulate pathology and interfere with diagnosis.
Our group has worked with a 3-T Magnetom Trio (Siemens, Erlangen, Germany) system for two years, with 50% of our time devoted to clinical work and 50% dedicated to research; 65% of the clinical time is dedicated to neuroradiology (2705 patients) and the remaining time to whole-body MRI. We have detected these artifacts during our case readings and have selected the most representative of each type to illustrate here.
We have observed magnetic susceptibility artifacts (29%), pulsation artifacts (57%), homogeneity artifacts (3%), motion artifacts (6%), truncation artifacts (3%) and, finally, artifacts due to poor or inadequate technique in the examined region.
High-field imaging offers the benefit of a higher signal-to-noise ratio, thus making possible the options of a higher imaging matrix, thinner slices, the use of spectroscopy and diffusion tensor imaging in the routine clinical neuroradiology with a reduction in time spent. It is vital to be able to recognize these artifacts in everyday practice as they can mimic pathological appearances, thus causing diagnostic errors that could lead to unnecessary treatment. Indeed, most of these artifacts could be avoided with an adequate technique.
我们在此阐述在常规3T临床神经放射学中发现的最常见的磁共振成像（MRI）伪影，这些伪影可模拟病变并干扰诊断。
我们团队使用一台3T Magnetom Trio（西门子，德国埃尔朗根）系统工作了两年，其中50%的时间用于临床工作，50%用于研究；65%的临床时间用于神经放射学（2705例患者），其余时间用于全身MRI检查。我们在病例读片中检测到了这些伪影，并挑选了每种类型中最具代表性的进行阐述。
我们观察到了磁化率伪影（29%）、搏动伪影（57%）、均匀性伪影（3%）、运动伪影（6%）、截断伪影（3%），最后还有因检查区域技术不佳或不充分导致的伪影。
高场成像具有更高信噪比的优势，从而使得在常规临床神经放射学中采用更高成像矩阵、更薄切片、使用光谱学和扩散张量成像并减少检查时间成为可能。在日常实践中能够识别这些伪影至关重要，因为它们可能模仿病理表现，从而导致诊断错误，进而引发不必要的治疗。实际上，采用适当的技术大多可以避免这些伪影。
