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The size of the field of measurement (FOM) in computed tomography is limited by the size of the x-ray detector. To enlarge the FOM one may laterally shift the detector by up to 50% of its size and apply well-known weighting functions to the rawdata prior to convolution and backprojection. In this case a full scan is required to obtain complete data though there is a small region, the inner FOM, that...
To quantify spatial resolution in CT one typically performs separate measurements for the lateral and the longitudinal point spread function (PSF). Many procedures further require reconstructions with very small voxel sizes, e.g. when wire phantoms are scanned. This, however, may already change the shape of the PSF. For example, this is the case when Moiré filters are applied or when iterative image...
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