Process and apparatus for the reconstruction of three-dimensional images of an object using two paths having a common axis

A process for reconstructing a three-dimensional image of an object with at least one two-dimensional array of sensors, said image expressing a property, varying in the object, of a radiation, comprising the steps of:

• moving the sensors in at least two trajectories around the object, said trajectories consisting of at least portions of circles having centers joined by a line perpendicular to planes in which the trajectories are comprised;
• focussing the sensors of each array to a common focal point beyond the object so as to view a conical space, the focal point having a constant position with respect to the array of sensors;
• taking measurements with the sensors consisting of sums of the property along rays passing through the object and directed to the focal point;
• summing measurements of the rays belonging to summation planes to obtain summations associated with the summation planes, the summation planes being defined by coordinates in an object reference frame;
• reconstructing the image by combining the summations.