Tag: MRI scan
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Comparison of Imaging Modes – Ultrasound, CT & MRI
How the three imaging modalities compare? We examine each of the three diagnostic imaging methods as discussed in the following sections: Ultrasound Imaging Unlike other imaging modalities, ultrasound resolution and penetration depends on the center frequency and type of frequency selected. The resolution is spatially variant and depends on both the size of the active…
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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…
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Introduction to Medical Diagnostic Techniques
Diagnostic techniques are investigations and tests performed on patients with the intention to identify the cause of illness. The ultrasound is sonic energy at frequencies above the audible range. The most widely used applications of ultrasound in diagnostic medicine involve the non-invasive imaging of internal organs or structures of the body. Such imaging can provide…