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Wave-CAIPI for highly accelerated MP-RAGE imaging.


ABSTRACT: PURPOSE:To introduce a highly accelerated T1-weighted magnetization-prepared rapid gradient echo (MP-RAGE) acquisition that uses wave-controlled aliasing in parallel imaging (wave-CAIPI) encoding to retain high image quality. METHODS:Significant acceleration of the MP-RAGE sequence is demonstrated using the wave-CAIPI technique. Here, sinusoidal waveforms are used to spread aliasing in all three directions to improve the g-factor. Combined with a rapid (2 s) coil sensitivity acquisition and data-driven trajectory calibration, we propose an online integrated acquisition-reconstruction pipeline for highly efficient MP-RAGE imaging. RESULTS:The 9-fold accelerated MP-RAGE acquisition can be performed in 71 s, with a maximum and average g-factor of gmax ?=?1.27 and gavg ?=?1.06 at 3T. Compared with the state-of-the-art method controlled aliasing in parallel imaging results in higher acceleration (2D-CAIPIRINHA), this is a factor of 4.6/1.4 improvement in gmax /gavg . In addition, we demonstrate a 57 s acquisition at 7T with 12-fold acceleration. This acquisition has a g-factor performance of gmax ?=?1.15 and gavg ?=?1.04. CONCLUSION:Wave encoding overcomes the g-factor noise amplification penalty and allows for an order of magnitude acceleration of MP-RAGE acquisitions. Magn Reson Med 79:401-406, 2018. © 2017 International Society for Magnetic Resonance in Medicine.

SUBMITTER: Polak D 

PROVIDER: S-EPMC5563495 | biostudies-literature | 2018 Jan

REPOSITORIES: biostudies-literature

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Wave-CAIPI for highly accelerated MP-RAGE imaging.

Polak Daniel D   Setsompop Kawin K   Cauley Stephen F SF   Gagoski Borjan A BA   Bhat Himanshu H   Maier Florian F   Bachert Peter P   Wald Lawrence L LL   Bilgic Berkin B  

Magnetic resonance in medicine 20170220 1


<h4>Purpose</h4>To introduce a highly accelerated T1-weighted magnetization-prepared rapid gradient echo (MP-RAGE) acquisition that uses wave-controlled aliasing in parallel imaging (wave-CAIPI) encoding to retain high image quality.<h4>Methods</h4>Significant acceleration of the MP-RAGE sequence is demonstrated using the wave-CAIPI technique. Here, sinusoidal waveforms are used to spread aliasing in all three directions to improve the g-factor. Combined with a rapid (2 s) coil sensitivity acqui  ...[more]

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