Which of the following is the correct reason that a cape-style lead barrier without a thyroid collar be used when exposing panoramic radiographs?

A) Due to the position of the PID, the thyroid collar would block the x-rays.
B) It would be difficult for a standing patient to maintain an apron-style barrier.
C) This type of lead barrier is less expensive and offsets the cost of the panoramic machine.
D) Cape-style barriers represent state-of-the-art new technology.

A
Explanation: A) The PID of the panoramic x-ray machine is in a fixed position at a slight negative angulation. Metal or dense material positioned at the shoulder level or above may interfere with the path of the x-ray beam.
B) The PID of the panoramic x-ray machine is in a fixed position at a slight negative angulation. Metal or dense material positioned at the shoulder level or above may interfere with the path of the x-ray beam.
C) The PID of the panoramic x-ray machine is in a fixed position at a slight negative angulation. Metal or dense material positioned at the shoulder level or above may interfere with the path of the x-ray beam.
D) The PID of the panoramic x-ray machine is in a fixed position at a slight negative angulation. Metal or dense material positioned at the shoulder level or above may interfere with the path of the x-ray beam.