RTK/Scripts/FDK

 # Create a simulated geometry
 rtksimulatedgeometry.exe -n 180 -o geometry.xml

 # Create projections of the phantom file
 rtkprojectgeometricphantom -g geometry.xml -o projections.mha --spacing 2 --dimension 128 --phantomfile [[File:SheppLogan.txt]]

 # Reconstruct
 rtkfdk -p . -r projections.mha -o fdk.mha -g geometry.xml --spacing 2 --dimension 128

 # Create a reference volume for comparison
 rtkdrawgeometricphantom --spacing 2 --dimension 128 --phantomfile [[File:SheppLogan.txt]] -o ref.mha