http://www.pdplan4life.com/clintrials.htm
If you want to see what it was like, scroll down the web page (link above) and look at the bottom left of the page - I've inserted a photo there.
This photo was taken of me by the technician just after the scan was completed. While in the scan, my head was inside the triangular area you see just past the top of my head.
I'm home now after the 5 1/2 hour plane ride (ouch) back to Arizona.
Cheers!