Abstract: Disclosed is a test object for an external radiation therapy treatment device, the treatment device including a rotating gantry carrying at one end a radiation head and, at the other end, a portal imager, the test object including a radiologically translucent plate within which at least one radiopaque member is embedded, the at least one radiopaque member forming a geometrical pattern having at least two points and the center of the geometrical pattern corresponding to the center of the radiologically translucent plate, and a fastening element to attach the test object on the radiation head.

Abstract: This phantom object is designed for a Winston-Lutz test on a device for radiation therapy treatment comprising a patient support having a rotation axis (V), a stand having a rotation axis (H) and a collimator having a rotation axis (C), locating means being provided for visually representing the theoretical positions (V?, H?, C?) of the three axes (V, H, C). A spherical ball is positioned at the center of a sphere in a material of electron density lower than that of the ball, the ball and the sphere both constituting the phantom object. The sphere has on its outer surface means for a visual alignment with the locating means allowing a positioning of the phantom object at the point of convergence of the three axes (V?, H?, C?).

Abstract: The object of the present invention is a computer-implemented method for generating digital images encoded into a format readable by medical imaging apparatus, characterized in that it comprises the steps of: defining, in a tridimensional continuous space, a tridimensional scene comprising a tridimensional continuous shape and an encompassing medium, said tridimensional shape being constituted from basic primary shapes by rotation, translation, overlapping or gathering of one or several basic primary shapes; discretizing the tridimensional scene obtained at the previous step into volume elements (voxels) using a weighting mechanism; segmenting the discretized tridimensional scene into voxels by creating bidimensional cross-sections of the tridimensional scene; and encoding the information describing the obtained bidimensional cross-sections of the tridimensional scene into a format readable by medical imaging apparatus.