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E1305. Fake News: MRI Artifacts
Authors
  1. Brandi Marsh; SUNY Downstate Medial Center
  2. Chi Wong; SUNY Downstate Medial Center
  3. Zerwa Farooq; SUNY Downstate Medial Center
  4. Neha Doshi; SUNY Downstate Medial Center
  5. Alexandra Napolitano; SUNY Downstate Medial Center
  6. Arthur Olson; SUNY Downstate Medial Center
  7. Scott Lehto; SUNY Downstate Medial Center
Background
MRI artifacts can be mistaken for pathology. Without understanding of these artifacts and how to fix them, the radiologist is left at the mercy of the machine and patient care suffers as a result. The purpose of this exhibit is to make the radiologist the master of the machine.

Educational Goals / Teaching Points
At the end of this tutorial, the learner should be able to identify MRI artifacts, understand how the artifacts are created, and know how to eliminate the artifacts. The cases will be presented in multiple choice format with answer slides discussing the visualized artifacts. The goal of this presentation is to have the reader recognize the artifact presented and not mistake it for pathology, while gaining knowledge about which parameters to adjust in order to correct the artifact when it obscures the region of interest.

Key Anatomic/Physiologic Issues and Imaging Findings/Techniques
The topics discussed include failure of fat suppression, field inhomogeneity, vascular and CSF pulsation artifact, susceptibility artifact, zipper artifact, aliasing, motion artifact, chemical shift type 1 and type 2, Gibbs phenomenon, crosstalk, magic angle, herringbone, and Moire fringes.

Conclusion
Understanding the physics of MRI proves valuable in clinical practice. By swapping phase and frequency encoding directions, changing the field of view, and shimming, we can improve image quality. By being aware of artifacts on certain sequences, we can know how to confirm or deny our suspicions by checking additional sequences. Once we have an understanding of artifacts, we can then exploit them to unmask pathology.