Thyroid scintigram. Sensitivity with sodium pertechnetate Tc 99m and gamma camera with pinhole collimator

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Abstract
To evaluate the reliability of thyroid scintigraphy in the diagnosis of nodular growths, scintigrams of patients who later underwent thyroidectomy were reviewed and correlated with pathologic findings. The scintigrams were all obtained with a 5-mm single-hole collimator-equipped .gamma.-scintillation camera after i.v. injection of 5 mCi of sodium pertechnetate Tc 99 m. In the group of 92 patients, 6 of whom had 2 histologically different lesions, 149 nodules were identified pathologically. There were 26 nodules 2-5 mm in diameter, of which 22 were benign and 4 were malignant. None of the 22 benign nodules were delineated scintigraphically. Superior image quality and resolution, low radiation dose, technical simplicity and speed make 99 mTc pinhole-camera scintigraphy the best procedure available for routine thyroid imaging.

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