Efficient multiple acquisitions by skipped phase encoding and edge deghosting (SPEED) using shared spatial information

Zheng Chang, Qing San Xiang, Jim Ji, Fang Fang Yin

Research output: Contribution to journalArticle

4 Citations (Scopus)


The fast MRI method of Skipped Phase Encoding and Edge Deghosting (SPEED) is further developed to accelerate multiple acquisitions. In a single acquisition, SPEED first acquires three sparse ghosted edge maps with an undersampling factor of N/3, which are modeled with a double-layer structure and described by three equations with two unknown ghosts, each with a unique ghost order index. By minimizing least-square-error, a pair of ghost order indexes is determined. Based on them, the two corresponding ghosts are resolved, leading to a deghosted image. In this case, three equations are needed to determine the ghost order index, while only two equations are required to resolve the two ghosts. This shows both inefficiency and potential. Multiple acquisitions often contain similar spatial information. The similarities can be used to improve efficiency by sharing the ghost order index among different acquisitions, leading to acceleration factors greater than that achievable with single acquisition.

Original languageEnglish
Pages (from-to)229-233
Number of pages5
JournalMagnetic Resonance in Medicine
Issue number1
Publication statusPublished - Jan 2009
Externally publishedYes



  • Efficient multiple acquisition
  • Fast imaging
  • Shared information

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging

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