how to automatically segment the ventricle of the brain ?

Please help me, I need to segment the ventricle of the brain as in this example :

I used region growth but it does not give a good result

[marwa za]

@ Image Analyst

Answer 1

[Image Analyst]

If simple thresholding and spatial cleanup (like bwareafilt) doesn't work, then try some of the more sophisticated algorithms in Vision Bibliography

See attached example