How to segment brain part and save segmentation and 3D image as one file not separate file?

Hello Team,

Greetings!!

Thank you very much for best service. I have two question this time:

  1. How to remove skull part from the 3 D brain image (I am focusing on 3D part only).

  2. For my project, I want (segmentation + nill. image file ) as one .niil file. How can I get segmented 3D image as one image?

Sincerely,
Student