Doing your homework on your next CT scanner? Digging up replacement parts for your current system? In either case it pays to know what you should expect when it comes to using, buying, and replacing your CT scanner tube. For those of you looking into GE systems from the BrightSpeed Select series, the tube you'll need to learn about is the MX165, AKA Solarix 350. There are several versions, so keep reading to find out about compatibility, how long you can expect your MX165 tube to last, and how much you can expect to pay when the time comes to replace it.