Tag: MRI
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Features of Modern MRI Scanners
Magnetic resonance imaging (MRI) is a medical imaging modality which employs magnetic fields and radio waves/radiofrequency (RF) energy to produces images of the body. This imaging technique is based on nuclear magnetic resonance (NMR), which is a quantum mechanical phenomenon exhibited by atoms having either an odd number of protons or neutrons. Such atoms have…
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What is Functional MRI (fMRI)?
Functional MRI (fMRI) is the use of MRI to detect localized changes in brain activity, usually in the form of changes in cerebral metabolism, blood flow, volume, or oxygenation in response to task activation. In other words, Functional MRI provides images of brain activity in response to various stimuli. These changes are interrelated and may…
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Contrast Agents Commonly Applied In Medical Imaging
Contrast agents emphasize or magnify the physiological features or functions that would otherwise, be invisible, weak or obscured in images. Contrast agents are commonly applied in vasculature and also employed in applications where the uptake of an agent by an organ is used to indicate the degree of functional or metabolic activity. Each agent is…
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Magnetic Resonance Imaging (MRI)
MRI is based on the magnetic properties of hydrogen which is one of the constituents of cerebral tissue and other tissues. The hydrogen atom has a single proton which possesses a magnetic moment or behaves like a small magnet called a spin. The spins of hydrogen nuclei have a random orientation in any region and…