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Band artifacts due to bulk motion.

Pippa Storey1, Qun Chen, Wei Li

  • 1Department of Radiology, MRI Research, Evanston Hospital, vanston Northwestern Healthcare, Evanston, Illinois 60201, USA. p-storey@northwestern.edu

Magnetic Resonance in Medicine
|December 5, 2002
PubMed
Summary
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Bulk motion causes band artifacts in fast gradient echo MRI. Artifact width depends on velocity and acquisition time, but parallel imaging can reduce it. These findings aid in interpreting motion-induced artifacts in MRI scans.

Area of Science:

  • Magnetic Resonance Imaging (MRI)
  • Medical Imaging Physics

Background:

  • Bulk motion during image acquisition in fast gradient echo sequences can lead to significant artifacts.
  • Understanding these artifacts is crucial for accurate image interpretation, especially in dynamic imaging scenarios.

Purpose of the Study:

  • To investigate the characteristics of band artifacts caused by bulk motion in fast gradient echo MRI.
  • To develop an analytical model predicting artifact width and explore mitigation strategies.

Main Methods:

  • Analytical modeling of artifact width based on object velocity, k-space acquisition time, and field of view.
  • Validation using phantom experiments simulating controlled bulk motion.
  • Preliminary cardiac imaging in human volunteers to observe artifacts in vivo.

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Main Results:

  • Artifact width shows a square-root dependence on velocity and k-space acquisition time.
  • Parallel imaging is predicted to reduce artifact width by a factor related to the acceleration parameter.
  • Observed dark bands in cardiac imaging, consistent with motion artifacts from heart wall movement.

Conclusions:

  • The analytical model accurately predicts band artifact width due to bulk motion.
  • Parallel imaging offers a viable method to reduce motion-induced artifacts.
  • Motion artifacts, particularly from cardiac wall motion, can manifest as dark bands in fast gradient echo MRI.