aliasing

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aliasing

A phenomenon that occurs when digitising less than two samples per period in a periodic function, where the anatomy being imaged by magnetic resonance extends beyond the field of view (FOV). Areas extending beyond the FOV boundaries are aliased back into the image to appear at artefactual locations.
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.

ali·as·ing

(āl'ē-ăs-ing)
Magnetic resonance imaging artifact produced when anatomy outside the field of view is mismapped inside it.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012