Parallel and anti-parallel echoes in beam spin echo experiments
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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Fig. 1: General scheme for spin echo based SER-EPI sequence: The standard SER-scheme is extended not only by the refocusing 180 RF-pulse but also by a gradient pulse in phase-encoding direction. This gradient prephasing pulse aligns the gradient echo with the spin echo of the first excitation pulse s1. Fig.2: k-space data of spin-echo based SER-EPI sequence: Phase-encode direction is top to bot...
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We show that a set of linearly independent parallel states {|−→ ni ,−→ ni 〉} can always be exactly transformed into the corresponding anti-parallel states {|−→ ni ,−−→ ni 〉} with certainty. But this is not true, in general, for a set of linearly independent anti-parallel states. Moreover, we show that for a set of linearly independent anti-parallel states one can exactly but probabilistically t...
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We show that the Bloch vectors lying on any great circle is the largest set SL for which the parallel states |− →n ,− →n 〉 can always be exactly transformed into the anti-parallel states |− →n ,−− →n 〉. Thus more information about − →n is not extractable from |− →n ,−− →n 〉 than from |− →n ,− →n 〉 by any measuring strategy, for − →n ∈ SL. Surprisingly, the largest set of Bloch vectors for which...
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ژورنال
عنوان ژورنال: Results in Physics
سال: 2019
ISSN: 2211-3797
DOI: 10.1016/j.rinp.2018.09.032