I had a ct scan 2 years ago without contrast and it showed some white spots so the dr ordered an mri. Everything turned out fine. The white spots were actually demylenation from migraines, very common. So, to answer your question, a ct scan CAN show them enough information to know if there is possible MS. However, the only sure way to diagnose MS is with an MRI , neurological exam and as a last resort, lumbar puncture. Good luck, I'm sure everything will turn out okay for you!