Figure 1. Typical transabdominal CT (a) and corresponding ¹¹C-DACA (N-[2-(dimethylamino)ethyl]acridine-4-carboxamide) PET images demonstrating radiotracer uptake in kidneys, spleen and renal tumour (b). Uptake of radiotracer is also seen in the heart, myocardium and mesothelioma (c) and gliomas (d). Kindly reproduced with permission from: Saleem A, Harte R, Matthews J, Osman S, Brady F, Luthra S et al. Pharmacokinetic evaluation of N-[2-(dimethylamino)ethyl]acridine-4-carboxamide in patients by positron emission tomography. J Clin Oncol 2001;19:1421–9.