Which of the following statements about the position indicating device (PID) is correct?
A) The shorter the PID, the less divergent the beam.
B) The longer the PID, the greater the radiation dose to the patient.
C) Pointed, closed-end plastic cone PIDs should no longer be used.
D) A recessed PID creates a shorter target-surface distance.
C
Explanation: A) The tip of the pointed cone was supposed to indicate the central ray and aid in positioning. However, x-rays are deflected through contact with the material of the pointed cone, producing scatter radiation, so their use should be discontinued.
B) The tip of the pointed cone was supposed to indicate the central ray and aid in positioning. However, x-rays are deflected through contact with the material of the pointed cone, producing scatter radiation, so their use should be discontinued.
C) The tip of the pointed cone was supposed to indicate the central ray and aid in positioning. However, x-rays are deflected through contact with the material of the pointed cone, producing scatter radiation, so their use should be discontinued.
D) The tip of the pointed cone was supposed to indicate the central ray and aid in positioning. However, x-rays are deflected through contact with the material of the pointed cone, producing scatter radiation, so their use should be discontinued.
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