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What are Hounsfield Units?
"Hounsfield units are a unit of measure that represents the different density levels of tissues and or other substances. The density of pure water was arbitrarily set at 0 HU and that of air at -1000 HU." (Hofer, 2000)
2000 Hoffer, M. CT Teaching Manual, Georg Thieme Verlag, pp.12-13.