1. An apparatus for computed tomography image reconstruction of an object, comprising: an input port for receiving a plurality of projection images of an object acquired by an imager along different projection angles with a field of view, FoV, whilst said object resides in a bore of said imager with at least a part of said object inside the FoV; a reconstruction module switchable to operate according to any one of at least two different reconstruction algorithms; an out-of-FoV-determiner; an output port configured to output the so reconstructed image, characterized in that the out-of-FoV-determiner is configured to measure the amount of material in the annular region formed by the region outside the FoV but inside the bore and is configured to instruct the reconstruction module to switch from a first reconstruction algorithm to a second reconstruction algorithm and to reconstruct according to said second reconstruction algorithm if the determined amount of the out-of-FoV material exceeds a threshold.