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Description
Actual Behavior
Stripe artefacts appear in the recon
I suspect it is some numerical issue. I recommend using a large DSD/DSO for now, or slightly offseting your angles.
Code to reproduce the problem (If applicable)
% VARIABLE DESCRIPTION UNITS
%-------------------------------------------------------------------------------------
% Distances
% This works:
geo.DSD = 2000; % Distance Source Detector (mm)
geo.DSO = 1800; % Distance Source Origin (mm)
% This generate striped images:
geo.DSD = 700; % Distance Source Detector (mm)
geo.DSO = 500;
geo.nDetector=[640;200]; % number of pixels 400,60 (px)
geo.dDetector=[0.25; 0.25]; % size of each pixel (mm)
geo.sDetector=geo.nDetector.*geo.dDetector; % total size of the detector (mm)
geo.nVoxel=[640;640;200]; % number of voxels 400,400,60 (vx)
geo.sVoxel=[160;160;50]; % total size of the image (mm)
geo.dVoxel=geo.sVoxel./geo.nVoxel; % size of each voxel (mm)
geo.mode='parallel'; % 'cone' or 'parallel'. Geometry type.
head=headPhantom(geo.nVoxel);
angles = [0:2:358]*pi/180;
% The following also removes the stripes
% angles=angles+0.01;
proj=Ax(head,geo,angles);
img=OS_SART(proj,geo,angles,1);
plotImg(img,'dim',3)