IMPULSE: A scalable algorithm for design of minimum specific absorption rate parallel transmit RF pulses
نویسندگان
چکیده
منابع مشابه
Designing RF Refocusing Pulses for Parallel Transmit Spin Echo Sequences
INTRODUCTION Parallel transmission of RF pulses [1, 2] has shown great potential in B1 inhomogeneity correction at high fields [3]. Most of the existing applications of parallel transmission, however, have been restricted to only gradient echo due to lack of systematic design of parallel transmit refocusing pulses. The difficulty of designing such pulses lies in that 1) the large flip angle nat...
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We propose an alternating optimization framework for the joint design of excitation k-space trajectory and RF pulses for small-tip-angle parallel excitation. Using Bloch simulations, we show that compared with conventional designs with predetermined trajectories, joint designs can often excite target patterns with improved accuracy and reduced total integrated pulse power, particularly at high ...
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Introduction Selective excitation in more than one dimension is plagued by effects that are due to the long duration of the RF pulses and gradient trajectories needed. B0 off-resonances, for example, dephase magnetization contributions created at different points in time during the excitation process. As a consequence, these contributions do not add up consistently which causes artifacts in the...
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deployable scissor type structures are composed of the so-called scissor-like elements (sles), which are connected to each other at an intermediate point through a pivotal connection and allow them to be folded into a compact bundle for storage or transport. several sles are connected to each other in order to form units with regular polygonal plan views. the sides and radii of the polygons are...
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ژورنال
عنوان ژورنال: Magnetic Resonance in Medicine
سال: 2018
ISSN: 0740-3194,1522-2594
DOI: 10.1002/mrm.27589