Basics for Radiography Techniques

RadiographyTechnique chart produces a 2-dimensional projection (or a shadow) of the 3-dimensional object using X-rays or gamma rays. In a typical RT set-up the source, its size and the specimen thickness are fixed, whereas Source to Focus distance SFD (some times called FFD in case of X-rays), the type of film and the exposure parameters (kV, mA, time or Ci-hrs) can be controlled by the radiographer.