I'm a little uneasy about the direction my health care is going: regular checkup---->ultrasound---->CT scan Hope nothing is needed after that. Anyhow, since I haven't had a scan before. What's involved? Someone I talked to claimed you just wear your regular clothes when they put you in the tube. True? How long are you in there? Is it quiet, noisy? Has anyone that isn't claustrophobic freaked out in one? Details pleae, if you'd had the unfortunate experience of one.