1. A method of performing geometric measurements on a radiological image comprising the steps of acquiring a digital image representation of said radiological image, applying said digital image representation to a display device connected to a computer and displaying said image, activating a measurement scheme that has been stored in said computer, said measurement scheme comprising a graphical part representing a relation between measurement entities and anatomy present in said radiological image and an internal part representing functional dependencies between said measurement entities; said graphical part and said internal part being bi-directionally linked, performing measurements on said displayed image, said measurements being guided by the activated measurement scheme.