Radiology · single question

A panoramic radiograph shows a ghost image projected over the opposite side at the level of the mandibular angle. What instruction prevents this on the retake?

1. Ask the patient to bite further forward on the bite block
2. Ask the patient to lower the chin slightly
3. Ask the patient to swallow and hold the tongue against the palate
4. Ask the patient to remove all jewelry, earrings, and metallic appliances

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