s001_sinogram_par2d.py

#-----------------------------------------------------------------------
#Copyright 2013 Centrum Wiskunde & Informatica, Amsterdam
#
#Author: Daniel M. Pelt
#Contact: D.M.Pelt@cwi.nl
#Website: http://dmpelt.github.io/pyastratoolbox/
#
#
#This file is part of the Python interface to the
#All Scale Tomographic Reconstruction Antwerp Toolbox ("ASTRA Toolbox").
#
#The Python interface to the ASTRA Toolbox is free software: you can redistribute it and/or modify
#it under the terms of the GNU General Public License as published by
#the Free Software Foundation, either version 3 of the License, or
#(at your option) any later version.
#
#The Python interface to the ASTRA Toolbox is distributed in the hope that it will be useful,
#but WITHOUT ANY WARRANTY; without even the implied warranty of
#MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
#GNU General Public License for more details.
#
#You should have received a copy of the GNU General Public License
#along with the Python interface to the ASTRA Toolbox. If not, see <http://www.gnu.org/licenses/>.
#
#-----------------------------------------------------------------------

import astra
import numpy as np

# Create a basic 256x256 square volume geometry
vol_geom = astra.create_vol_geom(256, 256)

# Create a parallel beam geometry with 180 angles between 0 and pi, and
# 384 detector pixels of width 1.
# For more details on available geometries, see the online help of the
# function astra_create_proj_geom .
proj_geom = astra.create_proj_geom('parallel', 1.0, 384, np.linspace(0,np.pi,180,False))

# Load a 256x256 phantom image
import scipy.io
P = scipy.io.loadmat('phantom.mat')['phantom256']

# Create a sinogram using the GPU.
# Note that the first time the GPU is accessed, there may be a delay
# of up to 10 seconds for initialization.
proj_id = astra.create_projector('line',proj_geom,vol_geom)
sinogram_id, sinogram = astra.create_sino(P, proj_id,useCUDA=True)

import pylab
pylab.gray()
pylab.figure(1)
pylab.imshow(P)
pylab.figure(2)
pylab.imshow(sinogram)
pylab.show()


# Free memory
astra.data2d.delete(sinogram_id)
astra.projector.delete(proj_id)