Contraindications: women during pregnancy and lactation. Patient preparation: 1. 3 days prior to the examination, start oral administration of a compound iodine solution, 3 times/day, 5-10 drops each time, to close the thyroid gland. Discontinue the use of phenazopyridine (benzylamine), reserpine, amphetamine (amphetamine), cocaine, phenylpropanolamine (norephedrine), alkaloids, 6-hydroxydopamine, insulin, and tricyclic antidepressants 1 week prior to the examination. 3. 1 night before the imaging, take a laxative to cleanse the intestine. 4.At present, our center performs two batches of adrenal medullary imaging tests every month, so you need to make an appointment in advance for this test.