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FIGURE 1. 131I disappearance from thyroid tissues over time (see text for descriptions of patterns). Group A: patients 1, 2, and 5–8 in whom Rx/Dx was <0.6 at 2 d. During the first day Rx/Dx was near unity in all but patient 7; group B: patients 3 and 10 in whom Rx/Dx was >0.6 at 2 d and in whom Rx/Dx values changed modestly over time; and group C: patients 4 and 9 in whom Rx/Dx levels were >1.0 at 2 d. For each subject the diagnostic dose was 1 mCi (37 MBq); therapeutic dose is expressed on each graphic plot. In patients 1, 2, and 4–6, the first and second components of therapeutic disappearance of 131I are inscribed and designated k1 and k2, respectively.
