You can find several medical image dataset through google. 

This one is quite useful to you:

http://www.via.cornell.edu/databases/

you can also find several images at http://www.radiopaedia.org   and gallery.com

Try also here:

http://www.mathworks.com/matlabcentral/fileexchange/2762-dicom-example-files

http://plastimatch.org/data_sources.html

http://www.osirix-viewer.com/datasets/

http://idoimaging.com/wiki/tiki-index.php?page=Sample+Data...

i would recommend http://www.ctisus.com/

it is the best regarding CT images.

http://www.osirix-viewer.com/datasets/

up

Petrus Gumarang hey have you found dataset of

normal CT brain image . I need this and it is urgent , if you have please provide me

Hey Petrus Gumarang Khushbu Kella

Have you got Brian Image CT data. Please share with me.

http://www.aylward.org/notes/open-access-medical-image-repositories

https://www.kaggle.com/kmader/siim-medical-images

https://github.com/sfikas/medical-imaging-datasets

medical-imaging-datasets:

https://github.com/sfikas/medical-imaging-datasets

http://www.via.cornell.edu/databases/

Try this website but the images are magnetic resonance imaging

https://my-ms.org/mri_brain_coronal.htm

from this website

https://www.kaggle.com/kmader/siim-medical-images

There are several sources where you can access normal CT brain image datasets for research or academic purposes. Here are a few options: