منابع مشابه
Improved susceptibility weighted imaging method using multi-echo acquisition.
PURPOSE To introduce novel acquisition and postprocessing approaches for susceptibility weighted imaging (SWI) to remove background field inhomogeneity artifacts in both magnitude and phase data. METHODS The proposed method acquires three echoes in a three-dimensional gradient echo (GRE) sequence, with a field compensation gradient (z-shim gradient) applied to the third echo. The artifacts in...
متن کاملNested multi-echo EPI Acquisition Technique for Oxygen Extraction Mapping
H. Schröder, A. Bongers, L. R. Schad Department of Medical Physics in Radiology, Deutsches Krebsforschungszentrum, Heidelberg, Germany Introduction Following a model of tissue structure, proposed by Yablonskiy [1], oxygen extraction fraction from blood (OEF) can be calculated by measuring blood volume fraction (λ) and reversible relaxation rate (R2). In this work, a new nested multi-echo EPI ac...
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Introduction: Coronary MR Angiography is a valuable tool for non-invasive assessment of coronary arteries. Presently, contrastenhanced, fat-saturated, ECG-triggered and navigator-gated 3D spoiled gradient-echo sequence is employed for whole-heart Coronary MRA at 3T. However, large static field variations at 3T frequently result in non-uniform fat-suppression over the field-of-view (FOV), obscur...
متن کاملA Multi-echo Acquisition Method with Reduced Echo Spacing for Robust IDEAL Water-Fat Decomposition at 3T
images from 6-pt IDEAL reconstruction, and the R2* map (c) from 6-pt T2*-IDEAL reconstruction. The echo spacing was 1.3ms (1.1π). Uniform water-fat decomposition was achieved. Figure 1 (left): IDEAL cost functions for two sets of echo times. The purpose of the IDEAL iteration is to search for the minimum (0Hz in this example) of the cost function curves. To avoid converging to local minima, the...
متن کاملFunctional MRI with variable echo time acquisition.
A new functional MRI protocol that integrates variable echo time (TE) acquisition and a block-design paradigm is proposed and evaluated with finger-tapping motor task. Simulations and experimental data show that the blood oxygenation level-dependent (BOLD) sensitivity achieved with this approach is comparable to that achieved using a conventional constant-TE protocol. The proposed variable-TE f...
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ژورنال
عنوان ژورنال: NeuroImage
سال: 2012
ISSN: 1053-8119
DOI: 10.1016/j.neuroimage.2011.10.057