=' font-family: monospace;'>A = forwardBackwardProjectCT(x,y,z, Nx, Ny, Nz, FOVa_x, axial_fov, subsets, implementation, deviceN)</span><span>, where </span><span style=' font-family: monospace;'>x</span><span>, </span><span style=' font-family: monospace;'>y</span><span> and </span><span style=' font-family: monospace;'>z</span><span> are the detector coordinates in the transaxial and axial directions.</span></div><div  class = 'S1'><span>In each of the three cases, the class object can simply be used as </