[Radiology in one hundred years.]

The history of radiology startet when Wilhelm Konrad Röntgen discovered the X-ray on the 8th of November 1895. At first there were X-rays on paper but fluoroscopy started soon after the discovery, and was used at first in diagnosis of lung- and heartdiseases. By introduction of contrast media the digestive system became visible on X-ray, and barium as a contrast agent was soon discovered. It became possible to do angiographies and at first natrium iodide was used as a contrast agent. As time went by other body systems could be examined like the nervous system, the heart, the arteries, etc. The greatest discovery after the X-ray was the computed tomography technique which made it possible to see axial slices and to differentiate between parenchymal organs. Two other techniques which do not use X-rays but are used in diagnoses are ultrasonography and magnetic resonance imaging.