My Dad always picked up pennies that were heads up, he said it was good luck. So I walked out of the Dr's office the first day I was diagnosed 24 years ago, seen a heads up penny, I still have it today, along with a bunch more. I have three that are taped together, they go with me every time.
Silly? Maybe, but it sure can't hurt....unless you forget they're in your pocket during a scan!!