I think people are worrying unnecessarily. I had an MRI scan on my head 2 years ago and asked if it made any difference to it and was told no-not to worry about it as it`s scanning inside the head and a system will not impede the beams. The equipment at the airports is trying to detect concealed objects on a person .. I hardly think a thin layer of lace attached to the scalp will even show up and if it should , by any chance, well you just tell the person discreetly what it is.. I am sure those security guys are told to expect things like that and to be discreet when dealing with people who wear.. .. if they want to check it out , they can bring you to a more private place like a room....my honest gut-feeling is that this is /will be a non-issue. Just my 2 -cents worth... cheers guys.. Paul.