I am currently studying to be a radiologist. The technology used to view and treat diseases within the human are amazing! 
Interesting, what does a radiologist do exactly ?
They prepare and use imagining technology like X-rays, CT scans and ultrasound machines to help diagnose patients. If you've ever broken a bone, you've probably met one.
OK, and when radiology was invented ?
The first uses of such technology go back to the early 1900s, but possibly even before. The exact time isn't super clear. 
I did not expected to be so old, it seems that CT scanners were introduced in hospitals in the last 40 years, am I right ?
History of computed tomography
The history of X-ray computed tomography goes back to at least 1917 with the mathematical theory of the Radon transform In October 1963, William H. Oldendorf received a U.S. patent for a "radiant energy apparatus for investigating selected areas of interior objects obscured by dense material". The first commercially viable CT scanner was invented by Sir Godfrey Hounsfield in 1967.
Mathematical theory.
The mathematical theory behind computed tomographic reconstruction dates back to 1917 with the invention of the Radon transform by the Austrian mathematician Johann
Radiology
Radiology is the medical specialty that uses medical imaging to diagnose and treat diseases within the human body.
A variety of imaging techniques such as X-ray radiography, ultrasound, computed tomography (CT), nuclear medicine including positron emission tomography (PET), and magnetic resonance imaging (MRI) are used to diagnose or treat diseases. Interventional radiology is the performance of usually minimally invasive medical procedures with the guidance of imaging technologies such as X-ray radiography, ultrasound, computed tomography (CT), nuclear