Radiology is a branch of medicine concerned with the use of radiant energy in the treatment and diagnosis of illnesses. This field is divided into two major categories: diagnostic radiology and interventional radiology. A radiologist is a physician who specialises in radiology.The outcome of an imaging study is not solely dependent on the indication or the technical execution. Diagnostic radiology specialists are the final link in the diagnostic chain, searching for relevant image information to evaluate and ultimately support a sound diagnosis.