CT Scan Hounsfield scale

       

• Hounsfield scale
• Air−--------------------------------------------------------(1000)
• Fat−-------------------------------------------------(120 to −90)
• Soft tissue on contrast CT ------------(+100 to +300)
• Bone-(Cancellous) ---------------------------( +300 to +400)
• Bone- (Cortical) –----------------------------(+500 to +1900)
• Subdural hematoma – (First hours) –---(+75 to +100)
• Subdural hematoma - After 3 days--------(+65 to +85)
• Subdural hematoma - After 10–14 days--(+35 to +40)

• Other blood – Unclotted------------------(+13 to +50)
• Other blood – clotted----------------------(+50to +75)
• Pleural effusion – Transudate------------(+2 to +15)
• Pleural effusion—Exudate---------------(+4 to +33)
• Water ---------------------------------------------------0
• CSF --------------------------------------------------+15
• Parenchyma- Lung-------------------(−700 to −600)

• Parenchyma- Kidney--------------------(+20 to +45)
• Parenchyma- Liver---------------------------( 60 ± 6)
• Parenchyma- Lymph nodes------------( +10 to +20)
• Parenchyma-  Muscle-------------------(+35 to +55)
• Parenchyma- Thymus----( +20 to +40 in children)
• Parenchyma- White matter------------( +20 to +30)
• Parenchyma- Grey matter-------------( +37 to +45)
• Gallstone- Cholesterol stone----------(+30 to +100)     
• Gallstone- Bilirubin stone-------------(+90 to +120)