Correcting partial volume effects in biexponential T 2 estimation of small lesions
نویسندگان
چکیده
منابع مشابه
Quantification of partial volume effects in planar imaging
Introduction: The limited resolution of the imaging system causes partial volume effects (PVEs). These results in spreading of image counts to the neighboring pixels. This phenomenon is called spill-out effect. This study aimed at quantifying PVEs using ImageJ. Methods:Technetium-99m solution of concentration of 74 kBq/ml was filled into spheres A, B<...
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pure GM CBF (2 row), and net CBF image (3rd row) are shown for AD (left panel) and HC (right panel). Note the overall lower intensity of CBF in AD patients as compared to the age-matched HC. Also, note that pure GM CBF maps are independent of GM fractional volume at a given voxel thus reflecting voxel’s GM flow density. Fig2: ROI-wise average CBF values for HC, MCI, and AD are shown in bleu, ye...
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Partial volume effects (PVE) are a consequence of limited spatial resolution in brain imaging. In arterial spin labeling (ASL) MRI, the problem is exacerbated by the nonlinear dependency of the ASL signal on magnetization contributions from each tissue within an imaged voxel. We have developed an algorithm that corrects for PVE in ASL imaging. The algorithm is based on a model that represents t...
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We propose a fast algorithm to estimate brain tissue concentrations from conventional T1-weighted images based on a Bayesian maximum a posteriori formulation that extends the "mixel" model developed in the 90's. A key observation is the necessity to incorporate additional prior constraints to the "mixel" model for the estimation of plausible concentration maps. Experiments on the ADNI standardi...
متن کاملquantification of partial volume effects in planar imaging
introduction: the limited resolution of the imaging system causes partial volume effects (pves). these results in spreading of image counts to the neighboring pixels. this phenomenon is called spill-out effect. this study aimed at quantifying pves using imagej. methods:technetium-99m solution of concentration of 74 kbq/ml was filled into spheres a, b and c of diameters: 26 mm, 20 mm and 16 mm r...
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ژورنال
عنوان ژورنال: Magnetic Resonance in Medicine
سال: 2014
ISSN: 0740-3194
DOI: 10.1002/mrm.25250