Abstract
Thyroid uptake of 99mTc was compared using different modes of acquisition and evaluation. The starting time of acquisition, 5 min or 20 min after injection, did not make any difference. Comparison of the rectangular standard ROI and an irregular thyroid-shaped ROI showed a slight overestimation by 0.26% for the rectangular ROI. The results demonstrate that certain differences in acquisition and evaluation of TcU are clinically not important; however, if normal values are to be defined, they have to be taken into account.
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