Process for the reconstruction of three-dimensional images of an area of interest of an object comprising the combination of measurements over the entire object with measurements of an area of interest of said object, and appropriate installation

Process for the reconstruction of three-dimensional images of an object (1) defined by values assumed by a function (f) on points of the object, the function being a property of a conical radiation having a focal point (S) and passing through the object, in which two series of measurements are taken on said object, each of the series of measurements being taken with a bidimensional array (5) of radiation detectors (6) oriented toward the focal point, the measurements consisting of sums assumed by the function on rays between the focal point and the detectors and the process incorporating an inversion algorithm calculating summations of the function on planes passing through the object, comprising the steps of:

• taking a first of said two series of measurements such that the radiation received by the detectors passes through an area of interest of the object, the reconstructed image relating to the area of interest of the object;
• and
• taking a second of said two series of measurements such that the radiation received by the detectors passes through the entire object, the measurements of the second series completing the measurements of the first series before using the inversion algorithm.