These same principles of accurate image projection can be demonstrated by using a flashlight and projecting the shadow of an object onto a wall in a dark room. Completing this simple exercise may help the novice radiographer to better understand how to apply these principles and their role in producing an accurate image. Also, it provides insight into how and why technical errors occur when the principles are violated.
The "perfect" radiographic technique incorporates all five principles of accurate image projection simultaneously. Unfortunately, an ideal technique which meets all the requirements for accurate image projection has not been found. However, the paralleling technique which typically utilizes receptor-holding devices is the preferred intraoral technique because it follows most of the principles of accurate image projection listed above.