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% FBP_ZSPLIT filtered back projection with simple splitting along vertical direction -> works only for classical tomography, not for laminography
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%
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% [rec] = FBP_zsplit(sinogram, cfg, vectors, varargin)
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%
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% Inputs:
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% **sino - sinogram (Nlayers x width x Nangles)
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% **cfg - config struct from astra.ASTRA_initialize
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% **vectors - vectors of projection rotation generated by astra.ASTRA_initialize
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% *optional*
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% ** 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
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% ** valid_angles = [] - list of valid angles, []==all are valid
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% ** filter = 'ram-lak' - name of the FBP filter
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% ** filter_value = 1 - fitlering value for the FBP filter
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% ** deformation_fields = {} - cell 3x1 of deformation arrays
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% ** GPU = [] - list of GPUs to be used in reconstruction
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% ** split_sub = [1,1,1] - splitting of the sub block on smaller tasks in the Atx_partial method , 1 == no splitting
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% ** verbose = 1 - verbose = 0 : quiet, verbose : standard info , verbose = 2: debug
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% ** use_derivative = false - calculate reconstruction from the phase derivative
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% ** extra_padding = false - surround the projection by void space to enforce zero around tomogram
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% ** keep_on_GPU - if false, move the reconstruction back from GPU before returning
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% ** determine_weights = true - reweight projections if the angles are not equidistant
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% ** mask = [] - apply mask on reconstruction , inputs is 2D or 3D array
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% ** padding = 0 - zero padding is improving standard tomography. 'symmetric' is good for lamino / local tomo
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% ** only_filter_sinogram = false - return filtered sinogram, do not backproject
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%
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% *returns*
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% ++rec - reconstructed volume
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%*-----------------------------------------------------------------------*
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%| |
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%| Except where otherwise noted, this work is licensed under a |
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%| Creative Commons Attribution-NonCommercial-ShareAlike 4.0 |
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%| International (CC BY-NC-SA 4.0) license. |
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%| |
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%| Copyright (c) 2017 by Paul Scherrer Institute (http://www.psi.ch) |
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%| |
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%| Author: CXS group, PSI |
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%*-----------------------------------------------------------------------*
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% You may use this code with the following provisions:
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%
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% If the code is fully or partially redistributed, or rewritten in another
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% computing language this notice should be included in the redistribution.
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%
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% If this code, or subfunctions or parts of it, is used for research in a
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% publication or if it is fully or partially rewritten for another
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% computing language the authors and institution should be acknowledged
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% in written form in the publication: “Data processing was carried out
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% using the “cSAXS matlab package” developed by the CXS group,
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% Paul Scherrer Institut, Switzerland.”
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% Variations on the latter text can be incorporated upon discussion with
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% the CXS group if needed to more specifically reflect the use of the package
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% for the published work.
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%
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% A publication that focuses on describing features, or parameters, that
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% are already existing in the code should be first discussed with the
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% authors.
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%
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% This code and subroutines are part of a continuous development, they
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% are provided “as they are” without guarantees or liability on part
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% of PSI or the authors. It is the user responsibility to ensure its
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% proper use and the correctness of the results.
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function [rec] = FBP_zsplit(sinogram, cfg0, vectors0, varargin)
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par = inputParser;
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par.KeepUnmatched = true;
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par.addOptional('split', [1,1,1,1]) % 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
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par.addOptional('keep_on_GPU', false) % keep results in GPU
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par.addOptional('verbose', true) % verbosity level
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par.addOptional('mask', []) % apply reconstruction mask, inputs is 2D or 3D array
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par.addOptional('GPU', []) % ids of the used GPUs
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par.addOptional('use_GPU', true, @islogical) % if false, use CPU based reconstruction
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par.parse(varargin{:})
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r = par.Results;
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[Nlayers,Nw,Nproj] = size(sinogram);
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cfg0.iProjAngles = Nproj;
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assert(cfg0.iProjU == Nw, 'Wrong sinogram width')
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assert(cfg0.iProjV == Nlayers, 'Wrong sinogram height')
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assert(mod(Nw,2)==0, 'Only even width of sinogram is supported')
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assert(length(r.GPU)<=1, 'For multiGPU use tomo.FBP function')
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if r.verbose > 0; fprintf('====== FBP split ==========\n'); end
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Nelements = numel(sinogram) ;
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if gpuDeviceCount
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Nblocks = r.split(3);
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r.split(3) = 1;
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gpu = gpuDevice;
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% empirical condition, may be too pesimistic
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Nblocks = max(Nblocks,ceil( (2*8*4* Nelements) / gpu.AvailableMemory)) ;
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Nblocks = max(Nblocks, Nelements/ double(intmax('int32')));
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Nblocks = max(Nblocks, length(r.GPU));
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else
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% CPU processing
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max_block_size = min(utils.check_available_memory*1e6, 20e9); %% work with 10GB blocks
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Nblocks = ceil( (6*8* Nelements) / max_block_size) ;
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end
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if ~r.use_GPU
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rec = tomo.FBP_CPU(sinogram, cfg0, vectors0, varargin{:}, 'verbose', 0);
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return
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end
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if Nblocks == 1 || cfg0.iProjU>4096 || cfg0.iProjV>4096
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% for small datatsets process everthing in a single block
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if Nblocks == 1
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sinogram = utils.Garray(sinogram);
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end
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rec = tomo.FBP(sinogram, cfg0, vectors0, varargin{:}, 'verbose', 0);
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if ~isempty(r.mask)
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rec = rec .* r.mask;
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end
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if ~r.keep_on_GPU
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rec = gather(rec);
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end
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else
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%% split tomogram into vertical blocks, it is the most effecient way how to calculate it
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% -> upload each block to GPU and keep it there for maximal speed
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Nl_small = ceil(Nlayers / Nblocks);
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% keep on GPU only if the volume is small enough !!
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r.keep_on_GPU = r.keep_on_GPU && (4*cfg0.iVolX*cfg0.iVolY*cfg0.iVolZ) < gpu.AvailableMemory / 10;
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if r.keep_on_GPU && gpuDeviceCount
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rec = gpuArray.zeros(cfg0.iVolX, cfg0.iVolY, cfg0.iVolZ, 'single');
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else
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rec = zeros(cfg0.iVolX, cfg0.iVolY, cfg0.iVolZ, 'single');
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end
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for ii = 1:Nblocks
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if r.verbose>0; utils.progressbar(ii, Nblocks); end
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ind = 1+Nl_small*(ii-1) : min(Nlayers, Nl_small*ii);
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if isempty(ind); continue; end
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if isa(sinogram, 'gpuArray')
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% if on GPU, use matlab memcpy
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sinogram_small = sinogram(ind,:,:);
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else
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% fast MEX memory copy
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pos = [Nl_small*(ii-1),0];
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sinogram_small = zeros(length(ind),Nw,Nproj, 'like', sinogram);
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sinogram_small = utils.get_from_3D_projection(sinogram_small, sinogram, repmat(pos,Nproj,1), 1:Nproj);
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end
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cfg = cfg0;
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vectors = vectors0;
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cfg.iProjV = size(sinogram_small,1);
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cfg.iVolZ = cfg.iProjV;
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vectors(:,4:6) = vectors(:,4:6) - vectors(:,10:12)*(cfg.iProjV - cfg0.iProjV)/2;
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sinogram_small = utils.Garray(fp16.get(sinogram_small));
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%% call standard FBP on the data that are on GPU
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try
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rec_tmp = tomo.FBP(sinogram_small, cfg, vectors,varargin{:}, 'split', r.split, 'verbose', 0, 'keep_on_GPU', r.keep_on_GPU);
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catch err
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if strcmp(err.identifier, 'parallel:gpu:array:OOM')
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warning(err.message)
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end
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keyboard
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end
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rec(:,:,ind) = rec_tmp;
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end
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end
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end
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