This article investigates the origins of the experiences involved in the diagnostics (detection and normative evaluation) of biological entities in image-based medical praxis. Our specific research aim presupposes a vast discussion regarding the origins of knowledge in general, but is narrowed down to the alternatives of anthropomorphism and biomorphism. Accordingly, in the subsequent chapters we will make an attempt to investigate and illustrate what holds the diagnostic experiential situation together—biological regularities, manifestation via movement, conscious synthesis, causal categories, or something else. (...) We argue that as long as knowledge originates out of practices, a promising way forward is to oscillate between the prominent although controversial ideas of the history of philosophy and observations of concrete human practices, such as, in our chosen example, image-based medical diagnostics of biological pathologies. Although a number of thinkers are involved in the discussion, Aristotle and Husserl are most important here as the representatives of historical paradigms on the matter. The body in this research was not taken solely as the physical entity (Körper) but rather as a transcendental, constitutive structure where diagnostic and biological processes synchronize in teleological movement (Leib). However, philosophical speculations are illustrated by actual radiograms, the interpretation of which brings us back to the aforementioned question of primacy regarding cognition. (shrink)