Shashank G. D, Uma Pandurangi
BACKGROUND Artifacts in MRI image are produced as a result of various factors related to the machine and the subject undergoing MRI. Artifacts not only affect the quality of images, but also lead to misinterpretation of images by mimicking the pathology. Thus the purpose of this article is to help the radiologist be aware of the most common types of artifacts in day-to-day practice, explain in short the physics related to the appearance of artifact and practical steps to reduce or eliminate the artifacts. Imaging in MRI machine is subjected to various types of artifacts. Artifacts lead to diagnostic dilemma and degradation of the image quality. Hence, it is necessary to understand the type of artifact and measures taken to minimize or eliminate the same. Understanding the artifacts is a three step process, firstly knowing about the type of artifact, secondly cause behind it and thirdly how to decrease or remove the artifacts. MATERIAL AND METHODS Indicated cases for MRI imaging with different protocols and sequences depending upon the need were performed at MAAX super speciality hospital an associated hospital of Subbaiah Institute of Medical Sciences, Shimoga with GE 1.5T MRI using conventional 2D and 3D Fourier transform sampling methods and performing the standard sequences mentioned in the image. RESULTS Day to day MRI indicated patients were scanned on 1.5 T MRI with different protocols and sequences later on acquiring these images showed varied artifacts these were characterized and classified later proper correction in protocol, sequences, by adding appropriate filters, adjusting the field of view and by counseling eliminating/reducing the artifacts and thus deriving a proper clinical interpretation. CONCLUSION Grouping the artifacts simplifies the understanding of the cause of artifact. The article also describes the nature of the imaging appearance and simple measures required to reduce or correct the artifacts. It will help the radiologist improvise the quality of the images and have a clear difference between pathology and an artifact.
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