<prompt> Xray aifact isA radiolucent areaAny abnormal opacity in the radiographProduced when patient moves while taking the filmAll of the above  <response>: Aifacts can present in a variety of ways including abnormal shadow noted on a radiograph or degraded image quality and have been produced by aificial means from hardware failure, operator error, and software post-processing aifacts. Common CausesImproper handling of the filmsErrors while processing the filmsPatient movement while taking the shootingCommon aifactsmotion aifact - due patient movement resulting in the distoed imageimage compositing or twindouble exposure - superimposition of two structures from different locations due to double exposure of same filmplateradio-opaque objects on or external to the patient e.g. necklaces, piercings, buttons, hairRef: Radiographic Imaging and Exposure, 4e. Mosby chapter 9 