Radiation Health & SafetyQuestion 28 of 100
A patient is prepared for a panoramic radiograph. What is the correct use of the thyroid collar?
a.It is generally omitted for panoramic imaging because it blocks part of the beam and obscures the image
b.It must always be worn for panoramic imaging and doubled in thickness
c.It is placed behind the patient's neck instead of in front
d.It is worn only if the patient asks for it after signing a waiver
Explanation
A thyroid collar is normally not used for panoramic exposures because the rotating beam would strike the collar and cast an artifact over diagnostic areas, requiring a retake and additional exposure. A lead apron without a collar may still be used. Placing the collar behind the neck serves no protective purpose, and shielding decisions are based on clinical guidelines, not on a signed waiver.
Law Reference: FDA/ADA Dental Radiographic Examinations: Recommendations for Patient Selection and Limiting Radiation ExposurePractice all 100 questions free — no signup required.
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