Basic Reading Computed Tomography (CT) of Brain

By…Ext.วรปรชัญ์ สามารถ

Systemic Approach to Head CT Interpretation

• Symmetry – Compare left and right side of the cranium

• Midline – Look for midline shift• Cross-sectional anatomy – Review anatomical landmark for

each slide– Brain tissue : gray matter, white matter , intracerebral lesions– CSF space : ventricle, basal cistern, cortical sulci, fissure– Skull and soft tissue : scalp swelling, fractures, sinuses, orbit

• Subdural windows : Look for blood collection adjacent to the skull

• Bone windows : Skull, orbit and sinuses, intracranial air

Lateral View of Brain

Ventricular System

Cross-sectional Anatomy

• Grey/White interface, Subcortical white matter

Cross-sectional Anatomy

• Paired of crescent-shape = Twin bananas

Cross-sectional Anatomy

Basal ganglia

Cross-sectional Anatomy

• Third ventricle, Basal ganglia, Superior cerebellar cistern

Hydrocephalous

Physiologic Calcification

Brain Anatomy

Cross-sectional Anatomy

• Third ventricle, Smiley face

Cross-sectional Anatomy

• Midbrain, Interpeduncular cistern

Cross-sectional Anatomy

• Star shape ~ Circle of Willis, • Fourth ventricle, Temporal horn ~ slit

Subarachnoid hemorrhage

Cross-sectional Anatomy

• Base of skull, Midline bony prominence, • Prepontine cistern, Pretrous bone, Frontal sinus

Cross-sectional Anatomy

• Orbits, Ethmoid air cell

The End…