Sir Godfrey Hounsfield was awarded with the Nobel Prize in Physiology/Medicine with Allan McLeod Cormack in 1979 for their work with CT scans.
https://www.amberusa.com/blog/remembering-sir-godfrey-hounsfield-inventor-ct-scanner
” The Hounsfield scale is used to measure radiodensity and, in reference to medical-grade CT scans, can provide an accurate absolute density for the type of tissue depicted. “https://en.wikipedia.org/wiki/Hounsfield_scale
Hounsfield units (HU) are a dimensionless unit universally used in computed tomography (CT)scanning to express CT numbersin a standardized and convenient form.
https://radiopaedia.org/articles/hounsfield-unit?lang=us
CT attenuation values are expressed, according to a linear density scale, as “Hounsfield units” (HU), after Sir Godfrey Newbold Hounsfield, the inventor of CT scanning. In the Hounsfield scale, water is arbitrarily assigned a value of 0 HU. All other CT values are computed according to(1)HU=1000×(μtissue−μH2O)/μH2O,
in which μ is the CT linear attenuation coefficient.