<prompt> Hounsfield units used in?CT scanMRIUSGX Ray  <response>: ANSWER: A CT scanREF: Suttons Radiology 7th e p. 1724The Hounsfield scale, named after Sir Godfrey Newbold Hounsfield, is a quantitative scale for describing radiodensity.The Hounsfield unit HU scale is a linear transformation of the original linear attenuation coefficient measurement into one in which the radiodensity of distilled water at standard pressure and temperature STP is defined as zero Hounsfield units HU, while the radiodensity of air at STP is defined as -1000 HUThe Hounsfield scale applies to medical grade CT scans but not to cone beam computed tomography CBCT scansSubstanceHUAir-1000Fat-120Water0Blood30 to 45Muscle40Contrast130Bone400 or more 