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Hounsfield unit |
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Hounsfield unit [hounz′fēld] Etymology: Godfrey N. Hounsfield, 20th century English scientist the numeric information contained in each pixel of a CT image. It is related to the composition and nature of the tissue imaged and is used to represent the density of tissue. Also called CT number, Hounsfield number. Hounsfield unit an arbitrary unit of x-ray attenuation used for CT scans. Each voxel is assigned a value on a scale in which air has a value of −1000; water, 0; and compact bone, +1000. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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A computed tomographic scan of the chest showed bilateral pleural effusions and fluid around the pericardium with an attenuation of 30 Hounsfield units, number suggesting the presence of blood or purulent fluid (Fig. [6] Fat is hypointense on CT, which is reflected by the negative Hounsfield units (usually -25 to -100). Density measurements revealed predominantly negative Hounsfield units that corresponded to fat tissue. |
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