Ghost artifact cancellation using phased array processing

Peter Kellman, Elliot R. McVeigh

Research output: Contribution to journalArticlepeer-review

Abstract

In this article, a method for phased array combining is formulated which may be used to cancel ghosts caused by a variety of distortion mechanisms, including space variant distortions such as local flow or off-resonance. This method is based on a constrained optimization, which optimizes SNR subject to the constraint of nulling ghost artifacts at known locations. The resultant technique is similar to the method known as sensitivity encoding (SENSE) used for accelerated imaging; however, in this formulation it is applied to full field-of-view (FOV) images. The method is applied to multishot EPI with noninterleaved phase encode acquisition. A number of benefits, as compared to the conventional interleaved approach, are reduced distortion due to off-resonance, in-plane flow, and EPI delay mis-alignment, as well as eliminating the need for echo-shifting. Experimental results demonstrate the cancellation for both phantom as well as cardiac imaging examples.

Original languageEnglish (US)
Pages (from-to)335-343
Number of pages9
JournalMagnetic Resonance in Medicine
Volume46
Issue number2
DOIs
StatePublished - 2001
Externally publishedYes

Keywords

  • Artifact
  • EPI
  • FISP
  • Ghost
  • Phased array
  • SENSE

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging
  • Radiological and Ultrasound Technology

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