The lecture is one of the classic modes of education in radiology and still the most effective way to learn or update your knowledge base. The CTisus iLecture Series offers numerous lectures in 23 various topics divided into organ systems (e.g., pancreas, liver, kidneys) or additional topics (e.g., protocol design, 3D imaging, incidentalomas). Each week, we add a lecture on CTisus and update this app twice yearly. Our lecture topics evolve with changes in our knowledge base and technology. We hope you enjoy the lecture series.