Artifact meaning in malayalam12/21/2023 ![]() Gradient echo sequences ( B) and DWI ( C) are very sensitive to artifacts, especially those produced by metallic objects. ![]() This artifact from clothing ornament – hyperintense signal on FLAIR sequence – may raise the suspicion of subarachnoid hemorrhage. Describing in detail the procedures to avoid or limit the artifacts would go beyond the scope of this paper but technical ways to reduce them can be found in the cited literature. Some proposals of reducing artifacts have been mentioned. It is also necessary to take them into consideration when interpreting the images. Knowledge of different types of artifacts and their origin, and of possible foreign bodies is necessary to eliminate them or to reduce their negative influence on MR images by adjusting acquisition parameters. make-up, tattoos, hairbands, clothes, endovascular embolization, prostheses, surgical clips, intraorbital and other medical implants, etc. Metallic and other foreign bodies which may be found on and in patients’ bodies are the main group of artifacts and these are the focus of this study: e.g. An artificially hyperintense signal on FLAIR images can result from magnetic susceptibility artifacts, CSF/vascular pulsation, motion, but can also be found in patients undergoing MRI examinations while receiving supplemental oxygen. Aliasing artifacts can be eliminated by increasing the field of view. Motion artifacts caused by breathing, cardiac movement, CSF pulsation/blood flow create a ghost artifact which can be reduced by patient immobilization, or cardiac/respiratory gating. A truncation artifact in the spinal cord could be misinterpreted as a syrinx. A gallery of such images was presented in this manuscript. Radiologists are frequently not informed about the medical history of patients and face postoperative/other images they are not familiar with. Artifacts in magnetic resonance imaging and foreign bodies within the patient’s body may be confused with a pathology or may reduce the quality of examinations.
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