FP_CUDA ======= This is a GPU implementation of a simple forward projection algorithm for 2D data sets. It takes a volume as input, and returns the projection data. Supported geometries: parallel, parallel_vec, fanflat, fanflat_vec. Configuration options --------------------- ================================ ======== ================================== name type description ================================ ======== ================================== cfg.ProjectionDataId required The astra_mex_data2d ID of the projection data. The forward projection is added to this data. cfg.VolumeDataId required The astra_mex_data2d ID of the reconstruction data. cfg.option.DetectorSuperSampling optional Specifies the amount of detector supersampling, i.e., how many rays are cast per detector. cfg.option.GPUindex optional Specifies which GPU to use. Default = 0. ================================ ======== ================================== Example ------- .. code-block:: matlab %% create geometries proj_geom = astra_create_proj_geom('parallel', 1.0, 256, linspace2(0,pi,180)); vol_geom = astra_create_vol_geom(256,256); %% store volume V = phantom(256); volume_id = astra_mex_data2d('create', '-vol', vol_geom, V); %% create forward projection sinogram_id = astra_mex_data2d('create', '-sino', proj_geom, 0); cfg = astra_struct('FP_CUDA'); cfg.ProjectionDataId = sinogram_id; cfg.VolumeDataId = volume_id; fp_id = astra_mex_algorithm('create', cfg); astra_mex_algorithm('run', fp_id); sinogram = astra_mex_data2d('get', sinogram_id); imshow(sinogram, []); %% garbage disposal astra_mex_data2d('delete', sinogram_id, volume_id); astra_mex_algorithm('delete', fp_id); This functionality can also be found in the astra function: .. code-block:: matlab [sinogram_id, sinogram] = astra_create_sino_cuda(V, proj_geom, vol_geom); [sinogram_id, sinogram] = astra_create_sino_cuda(V_id, proj_geom, vol_geom);