Paolo Marzullo, MD, FESC, FACC, is Director of the Nuclear Medicine Department at the Monasterio Foundation, Pisa, Italy. Founding member of the European and Italian Working Groups on Nuclear Cardiology, he is author of over 450 publications in the field of cardiac imaging, including cardiac CT and MRI.Giuliano Mariani, MD, is Full Professor of Nuclear Medicine, Director of the Regional Center of Nuclear Medicine and of the Post-graduate Specialty School in Nuclear Medicine of the University of Pisa Medical School, Pisa, Italy. Starting with pharmacokinetic studies using radioactive tracers in humans his research interests encompass virtually all clinical applications of nuclear medicine for both diagnosis and therapy. Author of over 270 articles published in international peer-reviewed journals, book editor and contributor in the fields of pharmacokinetics with radioactive tracers and diagnostic and therapeutic applications of nuclear medicine.