FIGURE 2. Schematic presentation of time–activity curve for oral activity (A) and glandular activity (B) in normal pattern on salivary gland scintigraphy. (A) X = initial shoulder, representing vascular perfusion peak; Y = maximum activity point before stimulation; Z = maximum activity point after stimulation; x, y, and z = counts at X, Y, and Z, respectively. (B) A = initial shoulder, representing vascular perfusion peak or, if shoulder is unclear, at 1 min; B =maximum activity point before stimulation; C = stimulation point at 40 min; D = point at 41 min; E = minimum activity point after stimulation; a, b, c, d, and e = counts at A, B, C, D, and E, respectively.
