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In this series, eighteen patients with Graves' disease were treated with 8000 rads (80 Gy) of radioiodine (131I), using the new high resolutional ultrasonic scanner for the determination of the accurate weight of the thyroid gland. The mean dose of radioiodine administered orally was 4.6 +/- 3.0 mCi (170.2 +/- 110.0 MBq) and 133.7 +/- 44.6 microCi/g (4.95 +/- 1.65 MBq). At one year after treatment, twelve of eighteen patients (66.7%) became euthyroid, five (27.8%) remained hyperthyroid and one (5.6%) became hypothyroid. Analysis of various factors which may be related to the effect of radioiodine therapy revealed that the weight of the thyroid gland in the hyperthyroid and euthyroid groups was significantly different (61.7 +/- 33.5 g vs. 25.1 +/- 9.1 g, p less than 0.05). Furthermore, all patients with larger glands (more than sixty grams) remained hyperthyroid, while the incidence of euthyroidism was as high as 80% in patients with smaller glands (less than forty grams). Although the number of patients studied was small, these results indicate that a larger thyroid gland requires a larger radioiodine dose per gram of tissue than a smaller gland, suggesting that the therapeutic radiation dose should be graded according to the gland size even when the gland size is accurately estimated by ultrasound. Further study is required to determine the appropriate radiation dose graded according to the gland size.

endocrinologia japonica

Radioiodine (131I) Therapy of Graves' Disease: Use of the New High Resolutional Ultrasonic Scanner for the Determination of the Accurate Weight of the Thyroid Gland.