Figure 4.
Correlations between SPECT/CT %thyroid uptake and thyroid hormone levels. (A) In patients with Graves disease, the %thyroid uptake measured by SPECT/CT had a statistically significant positive correlation with the free T4 level (P = 0.0184) and a marginally significant positive correlation with the T3 level (P = 0.0531). There was no correlation between the SPECT/CT %thyroid uptake and TSH level (P = 0.2050). (B) In patients with euthyroid, there were no correlations between SPECT/CT %thyroid uptake and thyroid hormone levels (P > 0.05). (C) In patients with thyroiditis, the SPECT/CT %thyroid uptake showed a negative correlation with the free T4 level with a statistical significance (P = 0.0243) and a positive correlation with TSH level with a statistical significance (P = 0.0032). No correlation was observed between the %thyroid uptake and the T3 level (P = 0.8754) in the patients with thyroiditis. CT = computed tomography, SPECT = single-photon emission computed tomography, TSH = thyroid stimulating hormone.