diff options
Diffstat (limited to 'main_func')
| -rw-r--r-- | main_func/FISTA_REC.m | 35 |
1 files changed, 26 insertions, 9 deletions
diff --git a/main_func/FISTA_REC.m b/main_func/FISTA_REC.m index d177748..1e4228d 100644 --- a/main_func/FISTA_REC.m +++ b/main_func/FISTA_REC.m @@ -487,7 +487,7 @@ else % Ordered Subsets (OS) FISTA reconstruction routine (normally one order of magnitude faster than the classical version) t = 1; X_t = X; - proj_geomSUB = proj_geom; + proj_geomSUB = proj_geom; r = zeros(Detectors,SlicesZ, 'single'); % 2D array (for 3D data) of sparse "ring" vectors r_x = r; % another ring variable @@ -495,7 +495,7 @@ else sino_updt_FULL = zeros(size(sino),'single'); % Outer FISTA iterations loop - for i = 1:iterFISTA + for i = 1:iterFISTA if ((i > 1) && (lambdaR_L1 > 0)) % in order to make Group-Huber fidelity work with ordered subsets @@ -531,16 +531,29 @@ else end for ss = 1:subsets X_old = X; - t_old = t; + t_old = t; numProjSub = binsDiscr(ss); % the number of projections per subset + sino_updt_Sub = zeros(Detectors, numProjSub, SlicesZ,'single'); CurrSubIndeces = IndicesReorg(counterInd:(counterInd + numProjSub - 1)); % extract indeces attached to the subset proj_geomSUB.ProjectionAngles = angles(CurrSubIndeces); - sino_updt_Sub = zeros(Detectors, numProjSub, SlicesZ,'single'); + + if (strcmp(proj_geom.type,'parallel') || strcmp(proj_geom.type,'fanflat') || strcmp(proj_geom.type,'fanflat_vec')) + % if geometry is 2D use slice-by-slice projection-backprojection routine + for kkk = 1:SlicesZ + [sino_id, sinoT] = astra_create_sino_cuda(X_t(:,:,kkk), proj_geomSUB, vol_geom); + sino_updt_Sub(:,:,kkk) = sinoT'; + astra_mex_data2d('delete', sino_id); + end + else + % for 3D geometry (watch the GPU memory overflow in earlier ASTRA versions < 1.8) + [sino_id, sino_updt_Sub] = astra_create_sino3d_cuda(X_t, proj_geomSUB, vol_geom); + astra_mex_data3d('delete', sino_id); + end if (lambdaR_L1 > 0) % Group-Huber fidelity (ring removal) - + residualSub = zeros(Detectors, numProjSub, SlicesZ,'single'); % residual for a chosen subset for kkk = 1:numProjSub @@ -551,8 +564,7 @@ else elseif (studentt > 0) % student t data fidelity - - + % artifacts removal with Students t penalty residualSub = squeeze(weights(:,CurrSubIndeces,:)).*(sino_updt_Sub - squeeze(sino(:,CurrSubIndeces,:))); @@ -566,8 +578,13 @@ else objective(i) = ff; % for the objective function output else % PWLS model - + + residualSub = squeeze(weights(:,CurrSubIndeces,:)).*(sino_updt_Sub - squeeze(sino(:,CurrSubIndeces,:))); + objective(i) = 0.5*norm(residualSub(:)); % for the objective function output + end + + % perform backprojection of a subset if (strcmp(proj_geom.type,'parallel') || strcmp(proj_geom.type,'fanflat') || strcmp(proj_geom.type,'fanflat_vec')) % if geometry is 2D use slice-by-slice projection-backprojection routine x_temp = zeros(size(X),'single'); @@ -579,7 +596,7 @@ else astra_mex_data3d('delete', id); end - X = X_t - (1/L_const).*x_temp; + X = X_t - (1/L_const).*x_temp; % ----------------Regularization part------------------------% if (lambdaFGP_TV > 0) |