This thesis traces the developments of imaging technologies used for medical diagnosis. Giddens' sociological theory of modernity serves as a basis for the consideration of the bureaucratisation of medicine and the use of the patient file as source of information about health. The importance of 'inscriptions', in relation to scientific knowledge and power, is analysed through Bruno Latour's theory. Donna Haraway's call to rethink objectivity, not as a quality of universal knowledge, but as a given point of view, also influence the approach of this discussion of diagnostic practices. / The author demonstrates the need for abstract concepts of patient and disease to achieve modern medicine. The links between theoretical notions (anatomical pathology, in particular) and diagnostic practices, as well as the concept of objectivity underlying the use of technology to gather information about health are examined. The effects of the biostatistical method used to evaluate health are also discussed. Finally, the importance of context in the experience of illness is noted.

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