[Volumetric computed tomography: Principles, parameters]

Abstract

CT has become the chest imaging technique of reference after chest radiograph performed on the frontline. Technological developments have resulted in shortening the duration of image acquisition to a few seconds, and allow imaging the entire chest in patients unable to take a long breath. This fact-sheet aims to present the basic principles of formation of the CT image, the various embodiments of this imaging technique, and its main pitfalls and constraints.