TSE with average-specific phase encoding ordering for motion detection and artifact suppression

Ling Zhang, Eugene G. Kholmovski, Junyu Guo, Dennis L. Parker

Research output: Contribution to journalArticle

4 Scopus citations

Abstract

Purpose: To detect motion-corrupted measurements in multiaverage turbo-spin-echo (TSE) acquisitions and reduce motion artifacts in reconstructed images. Materials and Methods: An average-specific phase encoding (PE) ordering scheme was developed for multiaverage TSE sequences in which each echo train is assigned a unique PE pattern for each preaveraged image (PAT). A motion detection algorithm is developed based on this new PE ordering to identify which echo trains in which PAIs are motion-corrupted. The detected PE views are discarded and replaced by uncorrupted k-space data of the nearest PAI. Both phantom and human studies were performed to investigate the effectiveness of motion artifact reduction using the proposed method. Results: Motion-corrupted echo trains were successfully detected in all phantom and human experiments. Significant motion artifact suppression has been achieved for most studies. The residual artifacts in the reconstructed images are mainly caused by residual inconsistencies that remain after the corrupted k-space data is corrected. Conclusion: The proposed method combines a novel data acquisition scheme, a robust motion detection algorithm, and a simple motion correction algorithm. It is effective in reducing motion artifacts for images corrupted by either bulk motion or local motion that occasionally happens during data acquisition.

Original languageEnglish (US)
Pages (from-to)1271-1282
Number of pages12
JournalJournal of Magnetic Resonance Imaging
Volume25
Issue number6
DOIs
StatePublished - Jun 2007

Keywords

  • Motion artifact suppression
  • Motion detection
  • Multiaverage scan
  • Phase encoding ordering
  • TSE sequences

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging

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