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Fig. 6D. —²⁰¹Tl-^99mTc pertechnetate subtraction scintigrams in 61-year-old man with hyperparathyroidism after cervical exploration. Delayed (2-hr) planar scintigram shows relatively improved conspicuity of parathyroid adenoma (arrow) compared with C. Note improved resolution of ^99mTc sestamibi scintigram compared with A. Improved resolution, because of more favorable energy of ^99mTc photons, is one advantage ^99mTc sestamibi has compared with ²⁰¹Tl imaging.

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