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Computerized axial tomography, also known as computed tomography or computerized tomography (CT), is a biomedical imaging method that results in a cross-sectional image called a tomograph or scan that is produced from computer analysis of thousands of X-rays passed through tissue at many different angles. The basic premise of X-ray imaging is that electromagnetic energy in the X-ray spectrum, when passed through the body, is attenuated to a greater degree by tissue of greater density. Differences in soft tissue, such as blood or fat versus dense bony tissue, can be visualized by the extent to which nonattenuated X-ray photons are captured by a detector or X-ray film. By passing a series of X-rays at multiple angles through the same tissue, CT allows for a ...

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