Abstract
Artifacts represent potential pitfalls in MR-angiography: radiologists should be aware of them to prevent their appearance. They can be classified according to the mechanism responsible for their genesis. Flow Artifacts are strictly related to modification of signal intensity induced by dephasing proton mechanism when the blood flow loses the characteristic laminar pattern; they are turbulence'artifact and artefact due to saturation. Hinge artefact, typical of 3DTOF sequence, is characterized by alternating hyper-hypointense punctiform images. Geometrical artefacts are caused by wrong geometric positioning of angiographic sequence or saturation bands; they are called hypointensity linear horizontal artefact and the artefact due to non-inclusion of the vase in the excited volume. Artifacts related to wrong acquisition time with respect to contrast medium bolus arrival are maki artefact and vascular blurring. Voluntary and involuntary movement are the primary cause of patient artifacts like the gost artifact. The main artifacts from post-processing consist of the artifact from projection of the background noise and the step artifact. Magnetic susceptibility artifacts are caused by paramagnetic external substances. Finally we remember radiofrequency artifacts, due to the instability of radiofrequency or nonhomogeneity of magnetic field or instability of the the system receiver-trasmitter.
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Laghi, A., Paolantonio, P., Rengo, M., Lucchesi, P. (2010). Artifacts in MR-Angiography. In: Neri, E., Cosottini, M., Caramella, D. (eds) MR Angiography of the Body. Diagnostic Imaging. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-79717-3_4
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DOI: https://doi.org/10.1007/978-3-540-79717-3_4
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