PART I BASICS: Animal Models for Brain Research -- Small Animal Molecular Imaging - μPET, μSPECT -- Cerebral Glucose Metabolism -- Cerebral Blood Flow Measurement with 15O-Water PET -- Principles of Brain Perfusion SPECT -- The Impact of Genetic Polymorphisms on Neuroreceptor Imaging -- PART II SYSTEMS: Acetylcholinesterase -- Adenosine Receptors -- Beta-Amyloid and Other Proteinopathies -- Central Benzodiazepine Receptors -- Cyclooxygenase-2 -- Dopamine System in Humans -- Endocannabinoid System -- Glutamate Receptors (Metabotropic) -- Histamine H3 Receptors -- Hormone Receptors (Steroids) -- Monoamine Oxidase B -- MRP1 Function in the BBB -- Neuroinflammation: From Target Selection to Preclinical and Clinical Studies -- Nicotinic Acetylcholine Receptors -- NMDA Receptors -- Norepinephrine Transporter -- Opioid Receptors -- P-Glycoprotein and Other ABC Transporters -- Phosphodiesterases -- Purinergic Receptors -- Serotonin System -- Serotonin Transporter and Monoamine Oxidase A -- Sigma-1 Receptors -- Sigma-2 Receptors -- Synaptic Density (SV2A) -- Tau Pathology -- Translocator Protein -- Tropomyosin Receptor Kinase -- Vesicular Acetylcholine Transporter -- Vesicular Monoamine Transporter.