Understanding MRI Artifacts: Causes and Examples
MRI artifacts are signal misrepresentations that can be caused by various factors such as patient movement, magnetic field inhomogeneity, metallic objects, and under-sampling. Motion artifacts, magnetic susceptibility artifacts, and aliasing/wrap-around artifacts are common types of artifacts that can impact the quality of MRI images.
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Presentation Transcript
WHAT ARE ARTIFACTS? Artifacts are simply signal misrepresentations that do not correspond to the location of the specific tissue imaged.
WHAT CAUSES ARTIFACTS? The Patient/ Subject Magnetic Field Inhomogeneity Machine Hardware
MOTION ARTIFACT seen as a smearing across an image. Primarily caused from patient/subject voluntary movement Can be caused by involuntary movement such as: Oesophageal contraction/ vascular pulsation during head and neck imaging Respiration/ cardiac activity during T-spine/Abdominal imaging Bowel peristalsis during pelvic imaging
MAGNETIC SUSCEPTABILITY Artifacts resulting from the presence of metallic objects. Distorts nearby structures & causes signal loss
ALIASING/ WRAP AROUND ARTIFACT Occurs when tissue outside the field of view is under sampled, causing misregistration of anatomic location. Easily identified by the superimposition/incorrect location of anatomy
