Date post: | 13-Dec-2014 |
Category: |
Health & Medicine |
Upload: | chirantan-chirurgery |
View: | 342 times |
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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