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Grayscale is used in CT scans (Computed Tomography) so the images sent to a computer for analysis contain lighter and darker "spots" of grey. This allows the computer to determine what parts of the body in that scan are blocking the most radiation, and can use it to create a 3D image of the area scanned, such as the skull or diaphragm.

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Q: Explain Gray Scale used in CT Scanning?
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