Figure 4

Salivary gland dynamic tracer emission CT with 99m Tc-sodium pertechnetate. A gustatory stimulus of vitamin C tablets begins at 20 min. The uptake capability of both submandibular and the left parotid glands is lower than that of the right parotid (A). Radiotracer development after the stimulation of vitamin C tablets at 20 min showed neither obvious decline in both sets of the glands nor any visible accumulation in the oral cavity (B). Parotid time-activity curve shows normal uptake on the right side (C), but decreased on the left (D), and no excretion on both sides after stimulation with vitamin C (blue line). OC: oral cavity; RP: right parotid gland; LP: left parotid gland; RS: right submandibular; LS: left submandibular.