This Brain OAR delineation workshop is aimed at all students, physician assistants, researchers and junior to experienced radiation oncologists who want hold their institutional brain delineation guideline against the currently available literature. Enabling even senior specialists to refresh and validate their knowledge and skills in this field. The workshop brings the live delineation workshops from the annual ESTRO conference to your doorstep in two sessions in which you can practice, learn and are free to ask any questions you might have on this subject.