期刊
MAGNETIC RESONANCE IN MEDICINE
卷 79, 期 6, 页码 2996-3006出版社
WILEY
DOI: 10.1002/mrm.26963
关键词
multi-echo; phase combination; ASPIRE; phase offsets; bipolar; ultra-high field
资金
- Oesterreichische Nationalbank (Oesterreichische National-bank, Anniversary Fund) [16213]
PurposeTo develop a simple method for combining multi-echo phase information from a number of coils in an array that requires no volume coil or additional scans and yields signal-to-noise ratio-optimal images that reflect only B0-related phase. Theory and MethodsTwo SNR optimal coil combination methods were developed which retrieve the B0-related phase by determining the coil-dependent phase offsets. The first variant, MCPC-3D-S, requires the unwrapping of one phase image; the second variant, ASPIRE, allows unwrapping to be avoided if two echoes j and k satisfy the echo time relation mTEk=(m+1)TEj, where m is an integer, making this a particularly fast and robust approach. Both developed methods constitute improvements over a prior method, MCPC-3D, in terms of robustness and computational expense. ResultsIn the brain at 7 T, phase matching and contrast-to-noise ratio were higher with MCPC-3D-S and ASPIRE than with phase difference reconstruction, and similar to the reference coil-dependent Roemer combination. Unlike the Roemer and virtual reference coil methods, the proposed approaches also eliminated all non- B0-related phase. ConclusionMCPC-3D-S is an improvement over prior multi-echo methods, which is useful if the ASPIRE echo time condition cannot be fulfilled. ASPIRE is a particularly fast and robust approach that runs on the scanner's reconstructor in a small fraction of the acquisition time. Magn Reson Med 79:2996-3006, 2018. (c) 2017 International Society for Magnetic Resonance in Medicine.
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