نتایج جستجو برای: diffusion magnetic resonance imaging

تعداد نتایج: 871150  

Journal: :NeuroImage 2001
S S Yoo C R Guttmann L P Panych

In an investigation of a multiresolution and multistaged approach in functional MRI, the relationship between spatial resolution and detection of functional activation is examined. The difference between functional detection and mapping is defined, and a multiresolution approach to functional detection is analyzed by constructing simple theoretical and experimental models simulating variations ...

2013
Seung Ki Baek Xavier Durang Mina Kim

Based on a recent model of paradigm shifts by Bornholdt et al., we studied mean-field opinion dynamics in an infinite population where an infinite number of ideas compete simultaneously with their values publicly known. We found that a highly innovative society is not characterized by heavy concentration in highly valued ideas: Rather, ideas are more broadly distributed in a more innovative soc...

Journal: :Physical review. E, Statistical, nonlinear, and soft matter physics 2012
G Foffano D Marenduzzo E Orlandini

In living cells, proteins combine three-dimensional bulk diffusion and one-dimensional sliding along the DNA to reach a target faster. This process is known as facilitated diffusion and we investigate its dynamics in the physiologically relevant case of confined DNA. The confining geometry and DNA elasticity are key parameters: We find that facilitated diffusion is most efficient inside an isot...

Journal: :Journal of physics. Condensed matter : an Institute of Physics journal 2009
Abbas Ali Saberi

We show that various surface parameters in two-dimensional diffusion limited aggregation (DLA) grow linearly with the number of particles. We find the ratio of the average length of the perimeter and the accessible perimeter of a DLA cluster together with its external perimeters to the cluster size, and define a microscopic schematic procedure for attachment of an incident new particle to the c...

Journal: :Diagnostic and interventional radiology 2012
Barış Türkbey Ömer Aras Nevzat Karabulut Ahmet Tuncay Turgut Erhan Akpinar Sedat Alibek Yuxi Pang Şükrü Mehmet Ertürk Riham H El Khouli David A Bluemke Peter L Choyke

Diffusion-weighted magnetic resonance imaging (MRI), which involves the acquisition of a magnetic resonance signal related to the Brownian motion of water protons in tissue, has become a useful technique for assessing tumors. In this article, we review the basic concepts, imaging strategies, and body applications of diffusion-weighted MRI in detecting and monitoring cancer.

2016
Roger Bourne Eleftheria Panagiotaki

Diffusion-weighted imaging (DWI) is the most effective component of the modern multi-parametric magnetic resonance imaging (mpMRI) scan for prostate pathology. DWI provides the strongest prediction of cancer volume, and the apparent diffusion coefficient (ADC) correlates moderately with Gleason grade. Notwithstanding the demonstrated cancer assessment value of DWI, the standard measurement and ...

2017
Arsany Hakim Markus Oertel Roland Wiest

Differentiation between infectious and neoplastic brain processes is crucial for treatment planning. Advanced magnetic resonance imaging techniques, such as diffusion, perfusion, susceptibility weighted imaging, and magnetic resonance spectroscopy, enhance the imaging differences between these two pathologies. However, despite the utilization of these advanced techniques, the pathologic process...

2016
Sylvia Klineova Rebecca Farber Catarina Saiote Colleen Farrell Bradley N Delman Lawrence N Tanenbaum Joshua Friedman Matilde Inglese Fred D Lublin Stephen Krieger

OBJECTIVE/BACKGROUND The majority of multiple sclerosis patients experience impaired walking ability, which impacts quality of life. Timed 25-foot walk is commonly used to gauge gait impairment but results can be broadly variable. Objective biological markers that correlate closely with patients' disability are needed. Diffusion tensor imaging, quantifying fiber tract integrity, might provide s...

2012
Hyung Joon Cho Eric E. Sigmund Yiqiao Song

When a porous material is inserted into a uniform magnetic field, spatially varying fields typically arise inside the pore space due to susceptibility contrast between the solid matrix and the surrounding fluid. As a result, direct measurement of the field variation may provide a unique opportunity to characterize the pore geometry. The sensitivity of nuclear magnetic resonance (NMR) to inhomog...

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