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Hounsfield Unit

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  1. Definition
    1. XRay attenuation unit used in CT Scan interpretation
    2. Characterizes the relative density of a substance
    3. Each pixel is assigned a value between -1k to 1k
  2. Indication
    1. Computed Tomographic Scanning (CT Scan)
  3. Substance densities in Hounsfield Units
    1. Air: -1000
    2. Fat: -50
    3. Water: 0
    4. Soft tissue such as muscle: +40
    5. Calculus: +100 to +400
    6. Bone: +1000
  4. References
    1. Hounsfield (1980) Med Phys 7:283

Hounsfield unit (C1552985)

Definition (HL7V3.0)1
Definition (HL7V3.0)1
ConceptsQuantitative Concept (T081)
EnglishHounsfield unit
Parent ConceptsUnitOfMeasureAtomInsens (C1700836), UnitOfMeasureAtomSens (C1701904)
SourcesHL7V3.0
Derived from the NIH UMLS (Unified Medical Language System)



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