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Abstract #4255

An Algorithm for Fast Parallel Excitation Pulse Design

Shuo Feng1, Jim X. Ji1

1Electrical and Computer Engineering, Texas A&M University, College Station, TX, United States

Spatially selective excitations with transmit array have been regarded as a key in solving several problems in high field MRI such as the transmit field inhomogeneity and the high power deposition. However, pulse design can be time consuming which may hinder its use from real-time applications. In this work, we propose a fast pulse design method by exploring the sparsity of the target spatial excitation pattern. The size of the system equation can be significantly reduced after a sparse transform and therefore the design speed is increased. Computer simulations in several common scenarios show that the proposed design method can achieve up to an order-of-magnitude speedup than the conventional design methods while still maintaining similar excitation accuracy.

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Keywords

accelerate acceleration accordingly achieve achieved addressing adopt advanced advantage almost amplitude applications approximation array audience bottom channel coil college complicated components computation computer computing conjugate constrained consuming corrected correction derived design designed designs dimensional directly domain dramatically electrical elevated employs engineering engineers equals equation equations equivalent error errors especially evaluated even example examples excitation excited experiment explores extremely fast faster feasible field fields finally fold frequencies frequency full functions gradient grid improves individual inhomogeneity keeping last leads linear magnitude mainly makes must normalized notations note numerical often optimizing parallel pattern patterns practical propose proposed pulse pulses rank real reduced reduces relatively requires rows scenarios selective several side sides significantly simplified simulations simulator since slab slightly smooth smoothness solve solved sophisticated sparse sparsity spatial specified speed speedup spiral spirals spoke spokes square station system tailored take target tissue trajectories trajectory transform transformed transmit truncated truncation uniform useful users volume waveform waveforms yield