CAMRT Radiography Practice Exam

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What is the CT value (Hounsfield unit) of water?

  1. -1000

  2. 0

  3. 20

  4. 100

The correct answer is: 0

The CT value, or Hounsfield unit, of water is defined as 0. This standardization is used for the calibration of computed tomography (CT) scanners and serves as a reference point for measuring the radiodensity of different tissues. The Hounsfield scale is a quantitative scale derived from the attenuation coefficients of various substances where air is assigned -1000, water is 0, and dense bone is often ranked much higher, around +1000. This established scale helps in differentiating between various types of tissue in medical imaging, allowing radiologists and medical professionals to accurately interpret CT images.

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