X-Ray Smartphone's The possibilities will be endless if the CMOS terahertz system is perfected and implemented. It can be put to use in hospitals as any doctor can utilize it to perform a quick x-ray on the patient, so there won’t be any need to stand in queue to get into the radiology department. It could be used by contractors for taking a peek at the insides of walls or it could even be used to check for counterfeit money. And you don’t have to worry about whether someone would take a look at what’s under your clothes with their smartphones (or be happy thinking you can do that) as the researchers are focused on developing the system for use in the range of less than four inches.