FIGURE 1.

Maximum-intensity projections of biodistribution at 4–72 h after injection in 2 representative subjects. (A) At 4 h after injection, radiotracer uptake is primarily in heart, liver, salivary tissues, and bone marrow, and gastrointestinal clearance is readily observable. At 24 and 48 h, retention is reduced in all tissues except gastrointestinal tract. (B) At 24–72 h after injection, clearance is seen from most tissues but is slower from bone marrow and salivary tissues. However, signal in gastrointestinal tract is visible through 72 h. %ID/cc = percentage injected dose per cubic centimeter of tissue. GI = gastrointestinal tract; H = heart; L = liver; M = bone marrow; S = salivary tissues.