As you can see from looking at this page, there are different types of MRI scanners. These are merely some of the scanner. There are many more types. The decision for a facility to purchase one of these scanners or others is merely a matter of economics and what target market the facility is trying to serve. It should be noted that all of the different types of scanners will produce some sort of a scanning image. Some will provide better images than others. The length of the exam may vary from one to the other.