Hounsfield scale
Hounsfield Scale[edit | edit source]
The Hounsfield scale, named after Sir Godfrey Hounsfield, is a quantitative scale that is essential in the field of computed tomography (CT) imaging for describing the radiodensity of various tissues. The scale assigns a specific numerical value, known as a CT number, to different levels of radiodensity, allowing for the clear differentiation of tissues in CT scans.
Background[edit | edit source]
Developed in conjunction with the invention of the CT scanner by Sir Godfrey Hounsfield, the Hounsfield scale revolutionized diagnostic imaging by providing a precise method to quantify tissue densities. This innovation has been fundamental in the advancement of medical imaging and diagnosis.
Scale Values[edit | edit source]
The Hounsfield scale is measured in units (HU), with distilled water at standard pressure and temperature (STP) set at zero HU. The scale ranges from -1000 HU (air) to approximately +3000 HU (dense bone), with various tissues falling at specific points within this range:
- Air: -1000 HU
- Fat: -100 to -50 HU
- Water: 0 HU
- White matter: +20 to +30 HU
- Grey matter: +37 to +45 HU
- Liver: +40 to +60 HU
- Dense bone: +700 to +3000 HU
Clinical Applications[edit | edit source]
The Hounsfield scale is instrumental in distinguishing between different types of body tissues in CT scans due to its sensitivity to variations in radiodensity. This capability is crucial for:
- Identifying tumors, cysts, and other lesions
- Detecting hemorrhages and calcifications
- Guiding radiological interventions
- Assessing bone mineral density
Limitations[edit | edit source]
While the Hounsfield scale is a powerful tool in CT imaging, it has limitations, including:
- Variability in HU readings due to scanner calibration
- Overlap in density ranges for certain tissues, potentially complicating interpretation
See Also[edit | edit source]
External Links[edit | edit source]
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