期刊
MAGNETIC RESONANCE IN MEDICINE
卷 56, 期 3, 页码 620-629出版社
JOHN WILEY & SONS INC
DOI: 10.1002/mrm.20978
关键词
transmit SENSE; parallel excitation; pulse design; selective excitation; large-tip-angle excitation
资金
- NIDA NIH HHS [DA15410] Funding Source: Medline
Parallel excitation has been introduced as a means of accelerating multidimensional, spatially-selective excitation using multiple transmit coils, each driven by a unique RF pulse. Previous approaches to RF pulse design in parallel excitation were either formulated in the frequency domain or restricted to echo-planar trajectories, or both. This paper presents an approach that is formulated as a quadratic optimization problem in the spatial domain and allows the use of arbitrary k-space trajectories. Compared to frequency domain approaches, the new design method has some important advantages. It allows for the specification of a region of interest (ROI), which improves excitation accuracy at high speedup factors. It allows for magnetic field inhomogeneity compensation during excitation. Regularization may be used to control integrated and peak pulse power. The effects of Bloch equation nonlinearity on the large-tip-angle excitation error of RF pulses designed with the method are investigated, and the utility of Tikhonov regularization in mitigating this error is demonstrated.
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