منابع مشابه
Root-Flipped Multiband Radiofrequency Pulses
Target Audience Researchers interested in simultaneous multislice (SMS) MR
متن کاملFast SE/TSE/RARE, refocusing with low flip angle pulses
1 Introduction The spin echo is a fundamental principle (1) that can be used for magnetic resonance imaging. Spin echo techniques are characterized by at least two rf-pulses. The first rf-pulse acts as an excitation pulse that converts longitudinal magnetization into transverse magnetization, and a second rf-pulse after TE/2 is used as a refocusing pulse that (partially) inverts the accumulated...
متن کاملPractical Non-selective Refocusing Pulses for 7 T MRI
Introduction Imaging sequences reliant upon non-selective refocusing (e.g., 3D TSE, 3D GraSE, and 3D SE-EPI) widely employ either block/sinc refocusing pulses susceptible to field inhomogeneities or adiabatic pulses that demand high SAR. The aim of this work was to evaluate a sample of short, low-SAR, non-selective refocusing pulses by comparing signals acquired with a 3D SE-EPI sequence at 7 T...
متن کاملDesigning 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...
متن کاملSlice-selective broadband refocusing pulses with B1 immunity
Introduction: Broadband refocusing pulses are of great interest for reducing chemical shift displacements, anomalous J modulation, and increasing spectral selectivity. The design of refocusing pulses with broad bandwidth in the presence of limited RF power was accomplished with the Shinnar-Le Roux (SLR) transformation in combination with zero-flipping [1]. Schulte et al. optimized for maximum p...
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ژورنال
عنوان ژورنال: Magnetic Resonance in Medicine
سال: 2015
ISSN: 0740-3194
DOI: 10.1002/mrm.25629