In:
Magnetic Resonance in Medicine, Wiley, Vol. 80, No. 2 ( 2018-08), p. 619-632
Abstract:
To develop parallel imaging techniques that simultaneously exploit coil sensitivity encoding, image phase prior information, similarities across multiple images, and complementary k‐space sampling for highly accelerated data acquisition. Methods We introduce joint virtual coil (JVC)‐generalized autocalibrating partially parallel acquisitions (GRAPPA) to jointly reconstruct data acquired with different contrast preparations, and show its application in 2D, 3D, and simultaneous multi‐slice (SMS) acquisitions. We extend the joint parallel imaging concept to exploit limited support and smooth phase constraints through Joint (J‐) LORAKS formulation. J‐LORAKS allows joint parallel imaging from limited autocalibration signal region, as well as permitting partial Fourier sampling and calibrationless reconstruction. Results We demonstrate highly accelerated 2D balanced steady‐state free precession with phase cycling, SMS multi‐echo spin echo, 3D multi‐echo magnetization‐prepared rapid gradient echo, and multi‐echo gradient recalled echo acquisitions in vivo. Compared to conventional GRAPPA, proposed joint acquisition/reconstruction techniques provide more than 2‐fold reduction in reconstruction error. Conclusion JVC‐GRAPPA takes advantage of additional spatial encoding from phase information and image similarity, and employs different sampling patterns across acquisitions. J‐LORAKS achieves a more parsimonious low‐rank representation of local k‐space by considering multiple images as additional coils. Both approaches provide dramatic improvement in artifact and noise mitigation over conventional single‐contrast parallel imaging reconstruction. Magn Reson Med 80:619–632, 2018. © 2018 International Society for Magnetic Resonance in Medicine.
Type of Medium:
Online Resource
ISSN:
0740-3194
,
1522-2594
Language:
English
Publisher:
Wiley
Publication Date:
2018
detail.hit.zdb_id:
1493786-4
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