FIELD: image forming apparatus; optical system.
SUBSTANCE: invention relates to projection through an image. Forward projection apparatus for performing a forward projection through an image comprises: a ray generating unit for generating rays traversing said image, said rays being fictive rays arranged along straight lines emanating from a fictive radiation source; an interpolation unit for determining interpolated values located on generated rays, wherein interpolation unit is adapted to apply an interpolation kernel to a plurality of image elements of said image for determining interpolated values; a summation unit for summing interpolated values located on a respective ray for determining a projection value for respective ray; number of generated rays and/or a ray spacing between generated rays is varied depending on ray width relative to an effective image element spacing between image elements.
EFFECT: higher quality of simulated projection data by reducing distortions.
14 cl, 9 dwg
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