How far should the plastic locator ring be placed from the patient's face?

The correct distance for positioning the plastic locator ring from the patient's face is 1/2 inch. This measurement is important in dental radiography to ensure optimal imaging results while minimizing the patient's exposure to unnecessary radiation.

Placing the locator ring at a distance of 1/2 inch allows for adequate alignment of the X-ray beam with the film or sensor, helping to avoid geometric distortion. This setup is crucial in obtaining high-quality radiographic images, which are essential for accurate diagnosis and treatment planning. Additionally, this distance helps maintain a safe and comfortable position for the patient, ensuring that the ring is close enough for effective imaging without causing discomfort or safety issues related to radiation exposure.