Fig. 5

[¹¹C]Erlotinib PET images. PET images of a typical patient (Nr 8), who was scanned first off erlotinib therapy (a); he then started therapy and was scanned again after 7 days (b). Axial, coronal, and sagittal views are shown, obtained by CT-fused parametrically reconstructed [¹¹C]erlotinib TBR_art,50–60 PET images. The color scale indicates the TBR_art,50–60 value per pixel (unitless). The primary tumor lesion (T) and regional lymph nodes (LN) are clearly visible in the absence of erlotinib therapy. Also, high uptake is seen in the liver (L)