Diffusion Mri
Diffusion Mri - Related Videos
01:12
Diffusion
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2026
Diffusion is the passive movement of substances down their concentration gradients—requiring no expenditure of cellular energy. Substances, such as molecules or ions, diffuse from an area of high concentration to an area of low concentration in the cytosol or across membranes. Eventually, the concentration will even out, with the substance moving randomly but causing no net change in concentration. Such a state is called dynamic equilibrium, which is essential for maintaining overall...
09:53
Role of Diffusion MRI Tractography in Endoscopic Endonasal Skull Base Surgery
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Cited by 3 •
2021
We present a protocol to integrate diffusion MRI tractography in patient work-up to endoscopic endonasal surgery for a skull base tumor. The methods for adopting these neuroimaging studies in the pre- and intra-operative phases are described.
10:46
Diffusion Imaging in the Rat Cervical Spinal Cord
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Cited by 9 •
2015
The goal of this protocol is to obtain high-quality diffusion weighted magnetic resonance imaging (DWI) of the rat spinal cord for noninvasive characterization of tissue microstructure. This protocol describes optimizations of the MRI sequence, radiofrequency coil, and analysis methods to enable DWI images free from artifacts.
03:31
Diffusion and Osmosis - Concepts
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2019
Cell Membranes and Diffusion In order to function, cells are required to move materials in and out of their cytoplasm via their cell membranes. These membranes are semipermeable, meaning that certain molecules are allowed to pass through, but not others. This movement of molecules is mediated by the phospholipid bilayer and its embedded proteins, some of which act as transport channels for molecules that otherwise would not be able to pass through the membrane, such as ions and carbohydrates.
08:18
Diffusion and Osmosis - Student Protocol
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2019
Diffusion in Agar ExpandNOTE: In this exercise, you will be given agar containing an indicator chemical called phenolphthalein. When phenolphthalein is exposed to the normal alkaline conditions in the agar, it will look pink. But when it is exposed to neutral or acidic conditions, it changes from pink to clear. You will make different size and shaped agar cubes as a model for cells to study the impact of cell size and shape on diffusion rate. To make the first set of cells, measure out and cut...
FAQs
Diffusion-sensitizing magnetic-field gradients make the MRI signal responsive to the movement of water molecules along particular directions. Comparing measurements across directions shows whether water movement is relatively uniform or constrained by tissue organization. In white matter, these directional differences provide information about the arrangement and integrity of axonal fibers that conventional MRI may not reveal.
Fractional anisotropy summarizes how strongly water movement favors particular directions rather than occurring equally in all directions. This makes it a quantitative measure of directional diffusion related to white-matter organization. In psychological and cognitive neuroscience research, the measure can help characterize differences in tissue properties when investigators examine links between brain structure, behavior, or development.
Conventional MRI can show anatomical features that are not captured by diffusion measurements alone, whereas Diffusion Mri adds information about microscopic water movement within tissue. That additional sensitivity helps researchers investigate microstructural organization, including directional patterns associated with axonal fibers. The two approaches therefore provide complementary perspectives on brain structure rather than identical information.
A study acquires MRI data while applying diffusion-sensitizing magnetic-field gradients in multiple directions. The resulting direction-dependent measurements are then analyzed with diffusion models that describe how water movement varies through tissue. Researchers may derive measures such as fractional anisotropy and use them to examine white-matter organization, integrity, or relationships with psychological variables.
Researchers can compare diffusion-derived measures with behavioral performance or learning-related outcomes to investigate how white-matter properties relate to mental processes. The method does not directly measure a psychological trait; instead, it supplies information about neural structure that can be analyzed alongside behavioral data. This supports research connecting brain organization with differences in cognition and behavior.
In developmental studies, diffusion measures can be examined across stages to investigate how white-matter organization relates to changing mental processes. In psychiatric research, the same approach can help evaluate relationships between white-matter properties, brain connectivity, and clinical conditions. These applications place tissue-level imaging findings within broader questions about development, behavior, and mental health.