X-ray Aifact is -
A radiolucent area
Any abnormal opacity in the radiograph
Produced when patient moves while taking the shoot
All of the above
Common aifacts (all forms of radiography) motion aifact due to patient movement resulting in a distoed image image compositing (or twin/double exposure) superimposition of two structures from different locations due to double exposure of same film/plate radiopaque objects on/external to the patient (e.g. debris in the housing debris in the housing caused by the collimator tube can cause small trapezoidal regions, indicative of lead shavings
Fundamentals in Radiology