The Hounsfield unit, a scale on which water is zero and air is minus one thousand, is used in which imaging technique?
- A.Magnetic resonance imaging
- B.Computed tomography
- C.Ultrasonography
- D.Electrocardiography
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The Hounsfield unit, named after Godfrey Hounsfield, expresses how strongly a small volume of tissue attenuates X-rays, on a scale fixed by definition at zero for water and minus one thousand for air.
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