There is no scintigraphically sufficient diagnostic amount of I that can be given prior to I therapy for thyroid cancer that does not cause thyroid stunning, i.e. it is not recommended to deliver pre-therapeutically more than a few gray (<5 Gy) into thyroid remnants. More investigations are required to confirm the proposed in-vitro and benign in-vivo models, but characteristic absorbed doses presented so far for in-vitro vs. in-vivo malignant vs. in-vivo benign thyroid environments differ roughly by an order of magnitude.
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