Retrospective removal of k-space artifacts for echo-planar images: Noise reduction algorithms for spike suppression

Roderick W McColl, Geoffrey D. Clarke, Ronald M Peshock

Research output: Chapter in Book/Report/Conference proceedingConference contribution


High demands are made of the gradient systems of MRI scanners during acquisition of echo-planar images. These may occasionally lead to spurious noise added to the received data in the form of short duration, high intensity "spikes." If these spikes are not caught prior to image formation, a severely degraded image may be formed. In the acquisition of functional MRI data this degradation may prohibit subsequent analysis of the data for identification of activated brain regions. We have devised several algorithms to isolate and remove these spurious spikes prior to the Fourier transform, and in one example show that subsequent fMRI analyses are possible. By contrast, the analysis is either impossible or produces differing results without this processing step.

Original languageEnglish (US)
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
EditorsJ.T. Dobbins III, J.M. Boone
Number of pages10
StatePublished - 1998
EventMedical Imaging 1998: Physics of Medical Imaging - San Diego, CA, United States
Duration: Feb 22 1998Feb 24 1998


OtherMedical Imaging 1998: Physics of Medical Imaging
Country/TerritoryUnited States
CitySan Diego, CA


  • Artifact
  • Echo-planar imaging
  • Functional magnetic resonance imaging
  • k-space
  • Suppression

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Condensed Matter Physics


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