A system and corresponding method for flexible generation of digitally
reconstructed radiograph (DRR) images on a graphics processing unit (GPU)
are provided, the system including a processor, an imaging adapter in
signal communication with the processor for receiving volumetric data, an
integration unit in signal communication with the processor for
integrating the volumetric data into incremental line integrals, and a
modeling unit in signal communication with the processor for modeling
composite line integrals from the incremental line integrals; and the
corresponding method including receiving three-dimensional (3D)
volumetric data into a graphics pipeline, integrating the 3D volumetric
data into incremental line integrals along a plurality of viewing rays,
modeling composite line integrals from the incremental line integrals,
and adding the incremental line integrals for each composite line
integral to form pixels of the DRR image.