When exposing a panoramic film, how should a lead apron be used in relation to a thyroid collar?

When exposing a panoramic film, the lead apron should be used without a thyroid collar. This is essential because a thyroid collar can interfere with the panoramic imaging process. The design of panoramic x-ray machines often requires a specific positioning of the patient's head and neck. The thyroid collar, while important for reducing exposure to the thyroid gland in other radiographic procedures, can obstruct the x-ray beam, resulting in potential artifacts or distortions in the image.

In the case of panoramic imaging, the lead apron should be positioned to cover the body effectively, without adding any additional materials like a thyroid collar that may obstruct the view. The apron is typically positioned below the patient's chin and rests comfortably on their shoulders, ensuring protection without compromising the quality of the imaging. This practice helps to maintain clear and accurate panoramic images while still ensuring patient safety from unnecessary radiation exposure.