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MRI Artifacts
  
Ultrasound Imaging Artifacts Open this link in a new window
Entry Slice Phenomenon (Artifact) 
Quick Overview
Artifact Information
NAME
Entry slice phenomenon
DESCRIPTION
Bright signals in blood vessels at the first slice
REASON
Unsaturated spins
The entry slice phenomenon arise in MRI when blood with unsaturated spins flows in the observed slice(s). These spins will emit a strong signal, because of their unsaturated status (flow related enhancement). The number of slices affected depends on the flow velocity and the slice thickness; the direction of flow determines which slices are affected. Time of Flight MRA is based on this entry slice phenomenon.

See also Flow Compensation, Flow Related Enhancement, Artifact Overview and Artifacts Reduction Index.
 
Further Reading:
  News & More:
Troubleshooting the ACR MRI Accreditation Phantom Tests
   by www.aapm.org    
Case Study 1 :
This image shows the bright signal (artifact) in the blood vessel at the first slice that the vessel enters.
 
Similar Artifacts:
 • Flow Artifact
 • Phase Encoded Motion Artifact
  FID Signal Artifact top
 
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 [last update: 2024-02-26 03:41:00]