Fast, simple gradient delay estimation for spiral MRI

Ryan K. Robison, Ajit Devaraj, James G. Pipe

Research output: Contribution to journalArticlepeer-review

29 Scopus citations


Timing delays between data acquisition and gradient transmission result in image degradation. This is especially true in spiral MRI, where delays can alter data in a nonuniform manner, generating significant artifact in the reconstructed data. The many methods that exist to mitigate these delays or measure the k-space coordinates require long measurement times, complicated analysis, specialized phantoms or hardware, or significant changes to the sequence of interest. A fast and simple method is proposed to measure delays on each gradient channel. It requires only minimal modification to an existing spiral sequence and can be used to measure independent delays on three gradient channels and any scan subject within six sequence repetition times. The effectiveness and accuracy of this method are analyzed.

Original languageEnglish (US)
Pages (from-to)1683-1690
Number of pages8
JournalMagnetic Resonance in Medicine
Issue number6
StatePublished - Jun 2010


  • Artifact correction
  • Eddy currents
  • Gradient delays
  • Reconstruction
  • Spiral

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging


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