DANB Radiation Health and Safety (RHS) Practice Exam

The use of a thyroid collar is recommended while taking lateral cephalometric radiographs due to the specific exposure risks associated with this type of imaging. Lateral cephalometric radiographs are commonly used in orthodontics and oral surgery to assess the relationships between dental structures and the structures of the head.

These radiographs can deliver radiation to sensitive areas, including the thyroid gland, which is located in the neck. The thyroid gland is particularly vulnerable to the effects of ionizing radiation, which can increase the risk of developing thyroid cancer later in life. By using a thyroid collar, which acts as a protective barrier, the radiation exposure to the thyroid gland can be significantly minimized, thus maximizing patient safety during the imaging procedure.

The use of a thyroid collar is not universally required for all types of X-rays. For example, it may not be necessary for certain dental radiographs where the risk to the thyroid is lower, such as bitewings or periapical images. In panoramic radiography, while a thyroid collar is generally recommended, it may not always be practical or required based on the specific technique used. Thus, understanding when and where to apply such protective measures is key to effective radiologic safety practices.