On the Hounsfield scale used in X-ray Computed Tomography (CT), what are the standard CT numbers assigned to air and pure water?
Answer and explanation
Correct answer: A. Air = -1,000 HU, Water = 0 HU
The Hounsfield Unit (HU) scale is calibrated such that pure water at standard temperature and pressure has a CT number of exactly 0 HU, and air has a value of -1,000 HU. Dense cortical bone typically ranges from +1,000 to +3,000 HU, while adipose tissue measures roughly -50 to -100 HU.
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