Nowhere in http://www.whsd.k12.pa.us/userfiles/1635/Classes/8083/12 Smart Majors That Will Land You a Job After Graduationx.pdf can I find that very key piece of information: the date. As the internet ages, absence of date in lingering articles is going to become more of an issue, adding yet another way that information can be unconstructive/misleading.
However, judging by the statement “expected to grow by 16 percent through 2018”, they’re referring to a BLS prediction issued approximately 2008. I don’t find it totally clear whether the article is saying it is NMT or medical imaging in general or what that had 16% predicted growth, but it wouldn’t be the first radical change I’ve seen BLS do. Anyway, for 2014-2024 BLS is predicting 1.5% growth for NMT. (The average across all occupations is 6.5%.)