Each programme is divided into courses and each session in the programme can normally be found once within those courses. If you work through every session in every course in turn, then you will eventually complete the whole programme. Courses can be organised in many ways, such as along anatomical lines (e.g. Muscular & Skeletal, Gastro-Intestinal etc), by level (e.g. Introduction, Advanced, etc) or by patient (e.g. Geriatric, Neo-natal, etc).
A learning path suggests an alternative route through the learning content that runs in parallel to the courses. For example, if the courses are organised along anatomical lines, then there may be a series of learning paths based on investigation (e.g. Ultrasound, MRI, etc).
Local organisations can also create their own learning paths (e.g. University College London Year 1 Radiology) inside a programme. These local learning paths will be available to all users, not just the institution that created it.