Hounsfield Units

Hounsfield Units

The Hounsfield scale or CT numbers, named after Sir Godfrey Newbold Hounsfield, is a quantitative scale for describing radiodensity.  Table 1 is a simple list of Hounsfield units for body tissues identified in a head CT.  The data is very useful when identifying structures in a CT scan and must be committed to memory.  Table 2 is a more comprehensive list.

Table 1.


Table 2.

Hounsfield 2


Hebb, Adam O., and Andrew V. Poliakov. ‘Imaging Of Deep Brain Stimulation Leads Using Extended Hounsfield Unit CT’. Stereotactic and Functional Neurosurgery 87.3 (2009): 155-160. Web. 2 Oct. 2015.

Slideshare.net,. ‘BASICS Of CT Head’. N.p., 2015. Web. 2 Oct. 2015.


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