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Magn Reson Med. 2016 Apr;75(4):1654-61. doi: 10.1002/mrm.25741. Epub 2015 May 15.

Experimental O-space turbo spin echo imaging.

Author information

  • 1Department of Diagnostic Radiology, Yale University, New Haven, CT, USA.
  • 2Department of Biomedical Engineering, Yale University, New Haven, CT, USA.

Abstract

PURPOSE:

Turbo spin echo (TSE) imaging reduces imaging time by acquiring multiple echoes per repetition (TR), requiring fewer TRs. O-space can also require fewer TRs by using a combination of nonlinear magnetic gradient fields and surface coil arrays. Although to date, O-space has only been demonstrated for gradient echo imaging, it is valuable to combine these two techniques. However, collecting multiple O-space echoes per TR is difficult because of the different local k-space trajectories and variable T2-weighting.

THEORY AND METHODS:

A practical scheme is demonstrated to combine the benefits of TSE and O-space for highly accelerated T2-weighted images. The scheme uses a modified acquisition order and filtered projection reconstruction to reduce artifacts caused by T2 decay, while retaining T2 contrast that corresponds to a specific echo time.

RESULTS:

The experiments revealed that the proposed method can produce highly accelerated T2-weighted images. Moreover, the method can generate multiple images with different T2 contrasts from a single dataset.

CONCLUSIONS:

The proposed O-space TSE imaging method requires fewer echoes than conventional TSE and fewer repetitions than conventional O-space imaging. It retains resilience to undersampling, clearly outperforming Cartesian SENSE at high levels of undersampling, and can generate undistorted images with a range of T2 contrast from a single acquired dataset.

KEYWORDS:

O-space imaging; fast spin echo; nonlinear gradients; parallel imaging; rapid acquisition with refocusing echoes; turbo spin echo

PMID:
25981343
PMCID:
PMC4644719
[Available on 2017-04-01]
DOI:
10.1002/mrm.25741
[PubMed - indexed for MEDLINE]
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