1. A method for generating images in computed tomography using 3D image reconstruction, the method comprising: scanning an examination object by moving a focus on a spiral focal track about the examination object using a conical beam emanating from the focus and using a detector for detecting the beam, the detector supplying output data corresponding to the detected radiation; and reconstructing image voxels from the scanned examination object from the output data and reproducing attenuation coefficients of the respective voxel, each image voxel being reconstructed separately from projection data that include a projection angular range of at least 180°, whereby a measured value filtered for each image voxel is accumulated only on the respective voxel, and an approximate weighting taking place for each voxel considered in order to normalize the projection data used relating to the respective voxel, wherein the approximate weighting takes place on the projection data after interpolating the projection data and before filtering the projection data, the approximate weighting using voxel individual Parker weights.