ctn software package provides Central Test Node, a DICOM implementation for medical imaging, 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 ctn
ctn is installed in your system.
Make ensure the ctn package were installed using the commands given below,
$ sudo dpkg-query -l | grep ctn *
You will get with ctn package name, version, architecture and description in a table
| Distro | Debian 9 stretch |
| Section | Graphics |
| Package | ctn |
| Version | 3.2.0~dfsg-4 |
| Description | Central Test Node, a DICOM implementation for medical imaging |
| Sub Section | Graphics |