X-rays aren't exactly healthy, but there aren't many other methods of “looking inside” the human body, and all of them involve rays of some sort, or ultrasonics.
Researchers from the Massachusetts General Hospital have invented a nice alternative to disease diagnosis though.
Not for all diseases, of course. There is no way, at this time, to determine each and every disease someone might be suffering from.
Still, as far as ailments affecting internal organs go, including cancer, the newest pill camera revealed by MGH will help greatly.
It isn't the first pill camera, to be sure, but it is the first one that can do more than snap a few pictures of the digestive system.
In fact, it can generate 3D images of the esophagus, stomach and intestines.
Using the new pill camera will allow doctors to avoid endoscopies (inserting flexible cameras through the throat to a sedated patient).