Neurofeedback can help reduce the anxiety clients with PTSD experience, because it helps the brain learn to regulate itself by showing the brain a mirror of itself. Check out this post for more on how neurofeedback works.
It is so exciting to see neurofeedback showing up more and more in mainstream media. Check this video out for another perspective on neurofeedback for PTSD. Let me know in the comment section what you think of the video in the comment section.