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Related Experiment Videos

Aliasing artifacts in MR imaging.

E Pusey1, C Yoon, M L Anselmo

  • 1Department of Radiological Sciences, UCLA School of Medicine 90024.

Computerized Medical Imaging and Graphics : the Official Journal of the Computerized Medical Imaging Society
|July 1, 1988
PubMed
Summary
This summary is machine-generated.

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Aliasing artifacts in MRI occur when the imaging field of view is too small. Radiologists can adjust parameters or use software to reduce these artifacts, sometimes trading resolution for speed.

Area of Science:

  • Medical Imaging
  • Radiology
  • Magnetic Resonance Imaging

Background:

  • Aliasing artifacts arise in magnetic resonance imaging (MRI) when the object's dimensions exceed the field of view.
  • These artifacts manifest as superimposed signals from outside the field of view, appearing at the image's opposite edge.

Purpose of the Study:

  • To outline the causes and mitigation strategies for aliasing artifacts in MRI.
  • To inform radiologists and technologists about controllable parameters and available software solutions.

Main Methods:

  • Discusses adjustments to field of view, gradient axes, and surface coil usage.
  • Explains manufacturer-provided software solutions like Inner Volume Imaging.
  • Highlights the trade-off between resolution, acquisition time, and aliasing.

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Main Results:

  • Increasing field of view, altering gradient axes, or using surface coils can reduce aliasing.
  • Software strategies like Inner Volume Imaging limit signal acquisition volume.
  • Increasing phase encoding steps enhances resolution but increases acquisition time.

Conclusions:

  • Aliasing artifacts are a common challenge in MRI phase encoding.
  • Radiologists and technologists have multiple methods to control or mitigate aliasing.
  • Clinical decisions may involve accepting aliasing for improved resolution and reduced scan times.