an><span> and </span><span style=' font-family: monospace;'>Inveon_CT_main.m</span><span>, where the first one is a pure 2D (fan-beam) example while the latter  two are 3D (cone-beam) examples (it is possible to convert the latter  two to 2D as well). In all cases, it is assumed that the source is  initially at the bottom of the image and rotates counter-clockwise.</span></div><div  class = 'S1'><span>There are three different ways to construct the class object. The recommended method is to use one of the e