Imaging Goals Dictate What FOV Is Ordered

When ordering a cone-beam computed tomography (CBCT) image, the most important question to ask is “What is my imaging goal?” This will dictate whether a large or small field of view (FOV) is needed. For example, if my goal is to evaluate the bone in an area for a single implant, then a small FOV would be appropriate because we are imaging only that 1 tooth and/or surrounding structures. If my imaging goal is to evaluate the relationship of the maxilla, mandible, and temporomandibular joints (TMJs) prior to a surgical procedure or orthodontic treatment plan, then a larger FOV would be appropriate.  ALARA: Radiographs are prescribed and, therefore, the appropriate image should be selected only after each case is evaluated. This is what we call "selection criteria." If a small FOV is enough to gain the information necessary, it would be irresponsible to image the entire head. If we did so, we would not be following the ALARA (as low as reasonably achievable) principle.  Full-H more...