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MRI Artifacts
  • Intro / Artifacts Index A-I
  
Ultrasound Imaging Artifacts Open this link in a new window
Artifact 
An image artifact is a structure not normally present but visible as a result of a limitation or malfunction in the hardware or software of the MRI device, or in other cases a consequence of environmental influences as heat or humidity or it can be caused by the human body (blood flow, implants etc.). The knowledge of MRI artifacts (brit. artefacts) and noise producing factors is important for continuing maintenance of high image quality. Artifacts may be very noticeable or just a few pixels out of balance but can give confusing artifactual appearances with pathology that may be misdiagnosed.
Changes in patient position, different pulse sequences, metallic artifacts, or other imaging variables can cause image distortions, which can be reduced by the operator; artifacts due to the MR system may require a service engineer.
Many types of artifacts may occur in magnetic resonance imaging. Artifacts in magnetic resonance imaging are typically classified as to their basic principles, e.g.:
Physiologic (motion, flow)
Hardware (electromagnetic spikes, ringing)
Inherent physics (chemical shift, susceptibility, metal)

Several techniques are developed to reduce these artifacts (e.g. respiratory compensation, cardiac gating, eddy current compensation) but sometimes these effects can also be exploited, e.g. for flow measurements.

See also the related poll result: 'Most outages of your scanning system are caused by failure of'

• View the DATABASE results for 'Artifact' (166).Open this link in a new window

 
Further Reading:
  Basics:
ARTEFACT VERSUS ARTIFACT
Saturday, 26 January 2002   by www.worldwidewords.org    
Which dental materials conflict with the use of MRI?
Saturday, 29 December 2012   by www.drbicuspid.com    
  News & More:
Clinical examination or whole-body magnetic resonance imaging: the Holy Grail of spondyloarthritis imaging
Tuesday, 28 February 2012   by 7thspace.com    
On the Horizon - Next Generation MRI
Wednesday, 23 October 2013   by thefutureofthings.com    
Technical Assessment of Artifact Production from Neuro Endovascular Coil At 3 Tesla MRI: An In Vitro Study
2012   by www.tmps.or.th    
Aliasing ArtifactInfo &  Case Studies 
Artifact by Patient MovementInfo &  Case Study 
Backfolding Artifactsee  Aliasing Artifact
Black Boundary ArtifactInfo &  Case Studies 
Cardiac Motion ArtifactInfo &  Case Study 
Central Point ArtifactInfo
Cerebro Spinal Fluid Pulsation ArtifactInfo &  Case Studies 
Chemical Shift ArtifactInfo &  Case Studies 
Chemical Shift Spatial Offsetsee  Chemical Shift Artifact
Contour Artifactsee  Black Boundary Artifact
Corrupted Data (Artifact)Info
Crisscross / Herringbone ArtifactInfo
Cross Excitation Artifactsee  Crosstalk (Artifact)
Crosstalk (Artifact)Info
Dark Boundary Artifactsee  Black Boundary Artifact
Data Clipping (Artifact)see  Radio Frequency Overflow Artifact
DC Artifactsee  Central Point Artifact
DC Offset Artifactsee  Central Point Artifact
Eddy Current ArtifactInfo &  Case Studies 
Entry Slice Phenomenon (Artifact)Info &  Case Study 
FID Signal ArtifactInfo
Field Inhomogeneity ArtifactInfo
Flow ArtifactInfo &  Case Studies 
Foldover Artifactsee  Aliasing Artifact
Ghosting ArtifactInfo &  Case Studies 
Gibbs ArtifactInfo
Gibbs Ringingsee  Gibbs Artifact
Instability Artifactsee  Motion Artifact
Machine Imperfection ArtifactInfo
  Artifacts - Index M-Z top
America is the only country that went from barbarism to decadence without civilization in between.
- Oscar Wilde
 
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