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tomo/+tomo/SART_zsplit.m
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% SART_ZSPLIT simple wrapper of the SART function that allows easy dataset
% splitting along the vertical axis
%
% rec=SART_zsplit(rec, sinogram, cfg, vectors, cache, relax )
%
% Inputs:
% **rec - initial guess of the reconstruction
% **sino - sinogram (Nlayers x width x Nangles)
% **cfg - config struct from ASTRA_initialize
% **vectors - vectors of projection rotation generated by ASTRA_initialize
% **Niter - number of iterations
% **relax - 0 == no relaxation, -> relax projection in presence of noise
% **split - split parameter for the ASTRA projector
% *optional*
% ** split =[1,1,1] - split the solved volume, split(3 is used to split in separated blocks, split(1:2) is used inside Atx_partial to du subplitting for ASTRA
% ** valid_angles = [] - list of valid angles, []==all are valid
% ** filter = 'ram-lak' - name of the FBP filter
% ** filter_value = 1 - fitlering value for the FBP filter
% ** deformation_fields = {} - cell 3x1 of deformation arrays
% ** inv_deformation_fields={}-cell 3x1 of inverse deformation arrays
% ** GPU = [] - list of GPUs to be used in reconstruction
% ** split_sub = [1,1,1] - splitting of the sub block on smaller tasks in the Atx_partial method , 1 == no splitting
% ** verbose = 1 - verbose = 0 : quiet, verbose : standard info , verbose = 2: debug
% ** relax = 0 - relaxation constant, shorter steps , 1 == no relaxation
% ** constraint= [] - constraint function that will be applied after every step
%
% *returns*
% ++rec - FBP reconstruction
%*-----------------------------------------------------------------------*
%|                                                                       |
%|  Except where otherwise noted, this work is licensed under a          |
%|  Creative Commons Attribution-NonCommercial-ShareAlike 4.0            |
%|  International (CC BY-NC-SA 4.0) license.                             |
%|                                                                       |
%|  Copyright (c) 2017 by Paul Scherrer Institute (http://www.psi.ch)    |
%|                                                                       |
%|      Author: CXS group, PSI  |
%*-----------------------------------------------------------------------*
% You may use this code with the following provisions:
%
% If the code is fully or partially redistributed, or rewritten in another
% computing language this notice should be included in the redistribution.
%
% If this code, or subfunctions or parts of it, is used for research in a
% publication or if it is fully or partially rewritten for another
% computing language the authors and institution should be acknowledged
% in written form in the publication: “Data processing was carried out
% using the “cSAXS matlab package” developed by the CXS group,
% Paul Scherrer Institut, Switzerland.”
% Variations on the latter text can be incorporated upon discussion with
% the CXS group if needed to more specifically reflect the use of the package
% for the published work.
%
% A publication that focuses on describing features, or parameters, that
% are already existing in the code should be first discussed with the
% authors.
%
% This code and subroutines are part of a continuous development, they
% are provided “as they are” without guarantees or liability on part
% of PSI or the authors. It is the user responsibility to ensure its
% proper use and the correctness of the results.
function rec=SART_zsplit(rec, sinogram, cfg, vectors, cache, relax )
[Nlayers, ~, ~] = size(sinogram);
Nvols = ceil(numel(rec)*4 / 1024e6);
Nlayers_on_GPU = ceil(Nlayers/Nvols);
for i = 1:ceil(Nlayers/Nlayers_on_GPU)
progressbar(i, ceil(Nlayers/Nlayers_on_GPU))
ind = (1+(i-1)*Nlayers_on_GPU):min(i*Nlayers_on_GPU, Nlayers);
%%%%%%%%%%%%%%%%%%%% SART SPLIT + MOVE TO GPU %%%%%%%%%%%%%%%%%%%%%%%
rec_tmp = gpuArray(rec(:,:,ind));
sinogram_tmp = gpuArray(sinogram(ind,:,:));
cfg_tmp = cfg;
cfg_tmp.iVolZ = length(ind);
cfg_tmp.iProjV = length(ind);
cache_tmp = cache;
cache_tmp.R = cache_tmp.R(ind,:,:);
%% call normal SART
rec_tmp = SART(rec_tmp, sinogram_tmp, cfg_tmp, vectors, cache_tmp, relax ) ;
rec(:,:,ind) = gather(rec_tmp);
end
end