itksnap software package provides semi-automatic segmentation of structures in 3D images, you can install in your Debian 9 (Stretch) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install itksnap
itksnap is installed in your system.
Make ensure the itksnap package were installed using the commands given below,
$ sudo dpkg-query -l | grep itksnap *
You will get with itksnap package name, version, architecture and description in a table
| Distro | Debian 9 stretch |
| Section | Science |
| Package | itksnap |
| Version | 3.4.0-2+b2 |
| Description | semi-automatic segmentation of structures in 3D images |
| Sub Section | Science |