An OPG, which stands for Orthopantogram, is an x-ray which gives a panoramic view of the mandible, jaw and teeth. The x-ray tube moves around the head, the x-ray film moves in the opposite direction behind your head. This generates an image slice where the mandible and teeth are in focus, and the other structures are blurred.Anterior and Lateral Cephalogram is the measurement of the skull or bones of the head and face, in order to study its growth and relative size to surrounding anatomical structure. This can be performed in 2 planes which are 90 degrees to each other. This x-ray is often performed with an OPG.