Vols. Videos


Last Updated: October 1, 2018

Classification of Head CT After Trauma
Grading system for brain injury based on cistern compression and midline shift
Diffuse Injury Grade CT Appearance Mortality
I Normal intracranial appearance 9.6%
II Basal cisterns present. Midline shift <5mm. No lesions. 13.5%
III Basal cisterns compressed or absent. Midline shift <5mm. No lesions >25cc. 34%
IV Midline shift >5mm. No lesions >25cc. 56.2%
Hounsfield Units Scale
Table with radiodensity measurements of important structures on CT scan
Basic Densities Hounsfield Units  
Air at STP -1000 Hounsfield basic density
Water 0 Hounsfield basic density
Fat -60 to -120 Hounsfield basic density