scintigraphy using Tc-99m pertechnetate

Question Number 1598

Question:
in thyroid scintigraphy using Tc-99m pertechnetate

a) maximum thyroid uptake is at about 20 seconds
b) incidental uptake in the choroid plexus is normal
c) the target-to-background ratio is less favorable than with iodine
d) malignant lesions that are hot on Tc-99m pertechnetate are likely to be cold on radioiodine
e) the agent is mostly excreted in the urine


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