The best way to learn proper English is to read news report, and watch news on TV. Watching TV shows is a great way to learn casual English, slang words, understand culture reference and humor. If you have already watched these shows then you may recall the words used in the following dialogs.

Oh, relax. She took Sheldon to the hospital
to get a brain SCAN.
The Big Bang Theory Season 2, Episode 15

Hey, Dad, whatever happened
with your SCAN?
Breaking Bad Season 4, Episode 8

...and if you disagree, I recommend
a CAT SCAN to look for a tumor...
The Big Bang Theory Season 1, Episode 10

I actually think the news from
the SCAN is gonna be good.
Breaking Bad Season 2, Episode 9

Yeah, I'd love to see
a SCAN of your brain sometime.
The Big Bang Theory Season 2, Episode 15