Understanding CT Scan and MRI Brain for Undergraduate Medical Students

Detail review of CT scan brain and basics of MRI brain for understanding intracranial pathologies specially head trauma related.

1. UNDERSTANDING CT SCAN & MRI BRAIN DR. FARRUKH JAVEED CONSULTANT NEUROSURGEON JPMC, KARACHI.

2. TECHNIQUE. Slice thickness may vary, but in general, it is between 5 and 10 mm for a routine Head CT

3. X-RAYS ARE ABSORBED TO DIFFERENT DEGREES BY DIFFERENT TISSUES CT findings described as densities- isodense / hypodense / hyperdense . Higher the density = whiter is the appearance Lower the density = darker the appearance Brain is the reference density Anything of the density as brain= isodense Higher density than brain= hyperdense ( skull is the best example) Anything darker (lower density) than brain= hypodense ( CSF and air are classical examples)

4. IMAGE SECTION

5. TEST

6. MRI

7. T1W IMAGE TE=<60 TR=<2000

8. T2W IMAGE TE=>60 TR>2000

9. FLAIR IMAGE TE>60 TR>2000

10. THANK YOU