Artefacts in magnetic resonance imaging (MRI) and their remedies

ABSTRACT

Background: An enormous number of artefacts are encountered in magnetic resonance imaging (MRI) which jeopardize the image quality. A comprehensive knowledge of the sources and the remedial measures needed is pivotal to enhance and optimize the image quality in magnetic resonance imaging (MRI). Objectives: The primary objectives of the study were to identify different MRI artefacts, to find the reason/cause of these artefacts and to find methods for correction of these artefacts. Materials and methods: This was a prospective study which included all the patients that were referred to our department for various MRI examinations. The study was carried at 1.5 tesla Magnetom Avanto Siemens, Germany. All the MRI examinations were performed by trained technologist in presence of an experienced radiologist. The MR images acquired were studied for the presence of any artefacts during the performance of MRI examination, the MR parameters at which the artefacts appeared and subsequently the remedial measures undertaken. Results: A total of 209 patients comprising 95 females and 114 males, referred to our department for MRI examinations of various body parts were studied. The commonest artefact observed was motion artefact in 43 (20.6%) patients followed by susceptibility artefact and aliasing artefact. Less common artefacts observed were chemical shift artefact, herring bone artefact, Gibb’s artefact, Moiré fringe artefact, zipper artefact and magic angle phenomenon. Arshed Hussain Parry, Abdul Haseeb Wani, Abdul Momin Jan, Tariq Ahmad Gojwari. Artefacts in magnetic resonance imaging (MRI) and their remedies. IAIM, 2019; 6(4) 122-130. Page 123 Conclusion: Thorough understanding of the sources of magnetic resonance imaging (MRI) artefacts and the mechanism of their production enables