FIGURE 4. (A and B) DV_Logan and simple tissue-to-plasma radioactivity ratios at 75 min (A) and 4 h (B) after injection. Excellent correlation is shown and both are virtually equal. Solid, diagonal line in A–C indicates equality between y- and x-axes. (C) Tissue-to-plasma ratios after 24 h are higher than DV_Logan.