Saunders’s analyses are informed by strands of cultural history and theory including art historical critiques of realist representation, Walter Benjamin’s concerns about violence in “mechanical reproduction,” and tropes of detective fiction such as intrigue, the case, and the culprit. Saunders analyzes the diagnostic “gaze” of medical personnel reading images at the viewbox, the two-dimensional images or slices of the human body rendered by the scanner, methods of archiving images, and the use of scans as pedagogical tools in clinical conferences. Bringing cloistered diagnostic practices into public view, he reveals the customs and the social and professional hierarchies that are formulated and negotiated around the weighty presence of the CT scanner. At the same time, by returning throughout to the nineteenth-century ideas of detection and scientific authority that inform contemporary medical diagnosis, Saunders highlights the specters of the past in what appears to be a preeminently modern machine.