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FIGURE 1. Typical timeactivity curves of 99mTcO4 for bilateral parotid glands in patients with postsurgical thyroid cancer after high-dose radiodione therapy. Solid line is curve for right parotid gland; dashed line is curve for left parotid gland. (A) Normal: Lemon juice was administered at 20 min after injection of 99mTcO4 (
). (B) Mild to moderately hypofunctioning (lower curve) and obstructive (upper curve). (C) Severely hypofunctioning. (D) Nonfunctioning.