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• W2921622600 abstract "¹⁸F-fluorocholine (¹⁸F-FCH) PET/CT is a promising and increasingly used scan technique in the preoperative imaging of parathyroid adenoma. Several acquisition methods have been evaluated in the literature, but the optimal image acquisition time point after administration of the tracer is still under debate. <b>Methods:</b> Patients who had hyperparathyroidism, underwent dual-time-point ¹⁸F-FCH PET/CT (image acquisition, 5 min; 60 min after injection), and had histologically proven pathologic parathyroid glands were retrospectively included in the study. Early and late images were compared both visually and quantitatively. <b>Results:</b> Sixty-four patients were included, and a total of 71 parathyroid glands were surgically removed. Visually, there were no differences between early and late images of hyperfunctioning parathyroid glands in 44 patients (69%); in 13 patients (20%), visualization on early images was better; in 6 patients (9%), visualization of hyperfunctioning glands was best on late images; and in 1 patient (2%), the lesion was exclusively visualized on late images. For the total cohort, there was a significant decrease in ¹⁸F-FCH uptake in the glands on late versus early time points (<i>P</i> = 0.001), but there was a significant increase in the ratio of parathyroid uptake to thyroid uptake (<i>P</i> = 0.037). The group of patients with better visualization on early images showed a decrease over time in both parathyroid uptake and the ratio of parathyroid uptake to thyroid uptake, significant in comparison to those in both the group with better visualization at later time points and the group in which visualization was similar at both time points (<i>P</i> values of 0.000–0.018). There were no significant differences in ¹⁸F-FCH uptake and the ratio of parathyroid uptake to thyroid uptake between the latter 2 groups (<i>P</i> values of 0.200–0.709). <b>Conclusion:</b> In most patients (89%), hyperfunctioning parathyroid glands were adequately visualized on early imaging; however, in a subset of patients (11%), such glands were best visualized at later time points. Therefore, we recommend the acquisition of dual-time-point images in parathyroid imaging with ¹⁸F-FCH PET/CT or the creation of an opportunity to acquire additional late images after review of early images when findings are inconclusive." @default.
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• W2921622600 date "2019-03-15" @default.
• W2921622600 modified "2023-10-14" @default.
• W2921622600 title "Dual-Time-Point ¹⁸F-Fluorocholine PET/CT in Parathyroid Imaging" @default.
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• W2921622600 doi "https://doi.org/10.2967/jnumed.118.225599" @default.
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