Phase-corrected bipolar gradients in multi-echo gradient-echo sequences for quantitative susceptibility mapping
نویسندگان
چکیده
منابع مشابه
Gradient-Echo Pulse Sequences
The basic idea of parallel imaging is to reduce the number of acquisition steps (i.e. phase-encoding steps) by decreasing the sampling density in kspace. Artefacts, in particular aliasing artefacts, that would result from the reduced sampling density are compensated by employing image data from several independent coil elements with different spatial sensitivity profi les for reconstruction. Th...
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Purpose: Quantitative susceptibility mapping (QSM) is a valuable new approach for subcortical brain iron mapping [1,2]. However, acquisition times are typically on the order of 5-10 minutes, which is acceptable in dedicated studies but limits wider use in the clinic for standard brain exams due to the considerable time penalty. The aim is to develop and test an extremely rapid means (under 10 s...
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1 Introduction Rapid imaging sequences are characterized by a fast train of excitation and gradient pulses. Between excitation pulses or within TR, the magnetization is not able to return to its thermal equilibrium. As a consequence, excitation pulses will influence both the remaining transversal and the remaining longitudinal magnetization. The steady-state magnetization of a multi pulse exper...
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A novel and effective technique is described for distortion correction in echo planar imaging (EPI) utilizing the field maps derived from multi-echo gradient-echo images. The distortions from different off-resonance related factors such as field inhomogeneity, eddy current effect, radiofrequency pulse frequency offset, and chemical shift effect can be simultaneously reduced to a great extent. W...
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BACKGROUND AND PURPOSE A novel quantitative susceptibility mapping (QSM) processing technology has been developed to map tissue susceptibility property without blooming artifacts. We hypothesize that hematoma volume measurement on QSM is independent of imaging parameters, eliminating its echo time dependence on gradient echo MRI. METHODS Gradient echo MRI of 16 patients with intracerebral hem...
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ژورنال
عنوان ژورنال: Magnetic Resonance Materials in Physics, Biology and Medicine
سال: 2014
ISSN: 0968-5243,1352-8661
DOI: 10.1007/s10334-014-0470-3