this field is very good ... its got lots of opportunities and a good pay...... What visa are you in US. If you are in F1, then i would advise you to study for 
your masters in that field. 

If you are in US with GC, then i think you have to take license exam...i have one of my friend in Chicago, He did his undegrade in other filed but did masters in Medical Tehchnology and his one working in one of the best hosptials in Chicago.. I would talk to my friend if you have any advise.

if you have any more questions just email me...