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: A computer-implemented method for generating digital images encoded into a format readable by medical imaging apparatus defines, in a tridimensional continuous space, a tridimensional scene including a tridimensional continuous shape and an encompassing medium, the tridimensional shape being constituted from basic primary shapes by rotation, translation, overlapping or gathering of one or several basic primary shapes; discretizes the tridimensional scene obtained at the previous step into volume elements (voxels) using a weighting mechanism; segments the discretized tridimensional scene into voxels by creating bidimensional cross-sections of the tridimensional scene; and encodes the information describing the obtained bidimensional cross-sections of the tridimensional scene into a format readable by medical imaging apparatus.