The difference in the changes of functional parameters between the two groups before and after 131I treatment was only the △MSR of the bilateral parotid glands, and the difference was statistically significant (p0.05). The UI, MSR, SUVavg and SUVavg of the bilateral parotid glands before and after 131I treatment in the vitamin C group Comparison of the SUVmax of the left parotid gland, the difference was statistically significant (p
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