CT Scan Proff.Sumit Kr Ghosh Dept of Internal Medicine Medical College 88 College Street Kolkata
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CT SCAN (BRAIN) Dr. Sumit Kr. Ghosh Asst. Professor Department of Medicine Medical College & Hospital, Kolkata
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CT Scan Proff.Sumit Kr Ghosh Dept of Internal Medicine Medical College 88 College Street Kolkata
Transcript of CT Scan Proff.Sumit Kr Ghosh Dept of Internal Medicine Medical College 88 College Street Kolkata
CT SCAN(BRAIN)
Dr. Sumit Kr. GhoshAsst. Professor
Department of MedicineMedical College & Hospital, Kolkata
COMPUTED TOMOGRAPHY
Godfrey Hounsfield
Hounsfield unit / number
-1000Black Air
+ 1000WhiteBone
0
Water
HYPODENSE ISODENSE HYPERDENSE
Black White
1. Air (air sinuses)
Brain parenchyma 1. Bone
2. CSF (ventricles/ sulci/cisterns)
2. Calcification ( Choroid plexus, pineal gland, basal ganglia, granuloma , tumour)
3. Fat (retro-orbital) 3. Heomarrhage
4. Infarct 4. Blood vessels
5. Edema 5. Ring –enhancing lesion
Hypo/hyper -intensityHypo/hyper-echoic
Conventional : thik slice : 7-10 mmHRCT : thinner slice : 1-2 mm