Radiography started on November 8, 1895 with the discovery of xray by a German physicist named Wilhelm Conrad Roentgen. X-rays belong to the family of electromagnetic radiation which includes radio waves, radiant heat, gamma radiation and visible light.

Radiography deals with the production of an image on a photographic film. This process uses ionizing radiation. The x-ray image is the pattern of information that the xray beam acquires as it passes through and interacts with the patient. Soft tissues attenuate x-ray photons differently, that is, the denser the tissue, the whiter the image. The visibility of diagnostically important information on the film is the basis of diagnostic accuracy of a radiographic film.

Since its discovery over 100 years ago, radiography has been utilized for both medical and industrial applications. Medically, it is the most readily available and basically the cheapest imaging method. It is frequently used as an initial study to evaluate diseases or abnormalities involving the chest, abdomen and bones. However, the diagnostic accuracy it offers is limited. Other imaging methods such as CT scans, MRI or ultrasound may be done to provide more diagnostic detail.

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