Advantages and disadvantages of the three techniques for rectangular panoramic radiographs of cylindrical objects are discussed. The first method used a technique from industry where the radiation source is centered within the object. In the latter two methods, the radiation source is placed outside the object, while the object is slowly rotated on a turntable. The radiation is demarcated by a collimator, 2.1 meters in length and 2 x 20 millimeters in the entrance slit and 2 x 120 millimeters in the exit slit. See also AATA 18-4 for related study.