Image-based ghost correction for interleaved EPI

Michael H. Buonocore, David C. Zhu

Research output: Contribution to journalArticle

35 Scopus citations

Abstract

A new image-based ghost correction technique is described for general interleaved EPI. This technique works reliably with both even- and odd-number interleaved EPI sequences. It estimates the phase distortions causing the ghosts as a general function of (x,y) even in the presence of a significant overlap of parent image and ghosts. If the phase distortion is assumed to be a function of x (frequency-encode direction) only, the new technique is similar to a recently published correction method for general interleaved EPI (Hennel. J Magn Reson 1998;134:206-213). However, that study concluded that the method for general interleaved EPI did not work. It showed that the SNRs of the edge pixels were too low to accurately estimate the phase distortion. The new technique utilizes not one, but many pixels in the image for estimating the phase distortion. The technique requires a user-defined ROI to outline the parent image and identify so-called eligible pixels for estimating the phase distortion. When all eligible pixels are used, the SNR of the phase distortion estimate is comparable to that obtained in single-shot EPI. This study provides the first examples of high-quality, image-based correction of multiple ghosts in general interleaved EPI.

Original languageEnglish (US)
Pages (from-to)96-108
Number of pages13
JournalMagnetic Resonance in Medicine
Volume45
Issue number1
DOIs
StatePublished - 2001

Keywords

  • Image artifacts
  • Image-based ghost correction
  • Interleaved echo planar imaging
  • Magnetic resonance imaging

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging
  • Radiological and Ultrasound Technology

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