Autocalibrated parallel imaging reconstruction with sampling pattern optimization for GRASE: APIR4GRASE
نویسندگان
چکیده
منابع مشابه
Reducing the Scan Time of Time-Resolved, 3D Phase Contrast Imaging with 2D Autocalibrated Parallel Imaging
INTRODUCTION Time-resolved 3-dimensional phase-contrast MR imaging (3D-PC MRI) has developed as an active area of research for vascular imaging [1]. The ability to acquired directional flow information along all three principle axes has led to investigations of the role of altered hemodynamics in vascular pathologies[2], quantification of flow in the major intracranical vessels [3], and researc...
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Current parallel imaging techniques for accelerated imaging require a fully encoded reference data set to estimate the spatial coil sensitivity information needed for reconstruction. In dynamic parallel imaging a time-interleaved acquisition scheme can be used, which eliminates the need for separately acquiring additional reference data, since the signal from directly adjacent time frames can b...
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Two strategies are widely used in parallel MRI to reconstruct subsampled multicoil image data. SENSE and related methods employ explicit receiver coil spatial response estimates to reconstruct an image. In contrast, coil-by-coil methods such as GRAPPA leverage correlations among the acquired multicoil data to reconstruct missing k-space lines. In self-referenced scenarios, both methods employ N...
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To improve parallel imaging techniques with autocalibration, algorithms were recently presented which estimate the coil sensitivities and the image at the same time [1,2]. However, even with perfectly known coil sensitivites parallel imaging suffers from much lower SNR than to be expected from the reduced scan time alone. This is due to the reconstruction process (quantified by the g-factor map...
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Introduction: Arterial Spin Labeling (ASL) uses blood water as an endogenous tracer to non-invasively measure cerebral blood flow. In a previous study, Günther et al. (1) has shown a near 3-fold improvement in perfusion signal-to-noise ratio (SNR) with single-shot 3D GRASE compared to conventional 2D EPI. However, a limitation of 3D GRASE is through-plane blurring caused by T2 decay. Reducing t...
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ژورنال
عنوان ژورنال: Magnetic Resonance Imaging
سال: 2020
ISSN: 0730-725X
DOI: 10.1016/j.mri.2019.08.019