MRI Artifacts: Causes and Examples
MRI ARTIFACTS
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
ZIPPER ARTIFACT
•
A Leak in the RF shielding
•
Can appear due to inadequate
door suction in the MR scan room.
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
