What component of the dental x-ray machine best limits the size of the x-ray beam to the approximate size of the image receptor?
A) A pointed cone
B) An open round cylinder
C) A rectangular PID
D) A slit collimator
C
Explanation: A) A rectangular position indicating device (PID) limits the size of the x-ray beam that strikes the patient to the actual size of the image receptor.
B) A rectangular position indicating device (PID) limits the size of the x-ray beam that strikes the patient to the actual size of the image receptor.
C) A rectangular position indicating device (PID) limits the size of the x-ray beam that strikes the patient to the actual size of the image receptor.
D) A rectangular position indicating device (PID) limits the size of the x-ray beam that strikes the patient to the actual size of the image receptor.
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