Merge branch 'polar_backproj' into 'master'

Polar FBP

See merge request !114
4 jobs for master in 5 minutes and 55 seconds (queued for 2 seconds)
Status Name Job ID Coverage
  Test
passed linux_docker #212969
docker

00:05:28

passed linux_shell #212968
shell

00:05:17

 
  Deploy
passed pages #212970
shell

00:00:26

passed pages:deploy

00:00:06