/usr/lib/libdcmimage.so.7 is in libdcmtk5 3.6.1~20150924-5.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/libdcmimage.so.3.6.1.abi2
/usr/lib/libdcmimage.so.3.6.1.abi2