1 function sino = astra_radon_3d(volume, theta)
2 % this function calculates 3D radon transform of the volume using ASTRA tools
6 % initialize ASTRA geometries:
7 proj_geom = astra_create_proj_geom('parallel3d', 1, 1, sz(3), sz(1), theta);
8 vol_geom = astra_create_vol_geom(sz(1), sz(2), sz(3));
9 %proj_id = astra_create_projector('linear3d', proj_geom, vol_geom);
10 %proj_id = astra_create_projector('cuda3d', proj_geom, vol_geom);
13 volume_id = astra_mex_data3d('create','-vol', vol_geom, volume);
14 sino_id = astra_mex_data3d('create','-sino', proj_geom, 0);
16 % initialize algorithm:
17 cfg = astra_struct('FP3D_CUDA');
18 %cfg = astra_struct('FP_CUDA');
19 %cfg.ProjectorId = proj_id;
20 %cfg.ProjectionGeometry = proj_geom;
21 %cfg.VolumeGeometry = vol_geom;
22 cfg.ProjectionDataId = sino_id;
23 cfg.VolumeDataId = volume_id;
26 alg_id = astra_mex_algorithm('create', cfg);
27 astra_mex_algorithm('iterate', alg_id);
30 sino = astra_mex_data3d('get',sino_id);
33 astra_mex_data3d('delete', sino_id);
34 astra_mex_data3d('delete', volume_id);
35 astra_mex_algorithm('delete', alg_id);
36 % astra_mex_projector('delete', proj_id);