A hybrid technique for spectroscopic imaging with reduced truncation artifact

Greg Metzger, Shantanu Sarkar, Xiaodong Zhang, Keith Heberlein Maqbool Patel, Xiaoping Hu

Research output: Contribution to journalArticlepeer-review

17 Scopus citations

Abstract

Traditionally, Fourier spectroscopic imaging is associated with a small k-space coverage which leads to truncation artifacts such as 'bleeding' and ringing in the resultant image. Because substantial truncation artifacts mainly arise from regions having intense signals, such as the subcutaneous lipid in the head, effective reduction of truncation artifacts can be achieved by obtaining an extended k-space coverage for these regions. In this paper, a hybrid technique which employs phase-encoded spectroscopic imaging (SI) to cover the central portion of the k-space and echo-planar spectroscopic imaging (EPSI) to measure the peripheral portion of the k- space is developed. EPSI, despite its inherently low SNR characteristics, provides a sufficient SNR for outer high-spatial frequency components of the aforementioned high signal regions and supplies an extended k-space coverage of these regions for the reduction of truncation artifacts. The data processing includes steps designed to remove inconsistency between the two types of data and a previously described technique for selectively retaining only outer k-space information for the high signal regions during the reconstruction. Experimental studies, in both phantoms and normal volunteers, demonstrate that the hybrid technique provides significant reduction in truncation artifacts.

Original languageEnglish (US)
Pages (from-to)435-443
Number of pages9
JournalMagnetic Resonance Imaging
Volume17
Issue number3
DOIs
StatePublished - Apr 1999

Keywords

  • Echo-planar
  • MRS
  • Spectroscopic imaging
  • Truncation artifact

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