Non-invasive in vivo PET imaging of macrophage metabolism using [18F]-FDG. PET images (A and D), CT images (B and E), and superimposed PET/CT images (C and F) in the sagittal (I) and coronal (II) planes for WHHL (A, B, and C) and control (D, E, and F) rabbits. Orange arrows, orange arrowheads, and white arrowheads indicate aortas, kidneys, and livers, respectively. Reproduced from [62] with permission from the Society of Nuclear Medicine.