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2026-09-17 20:39:08 +09:00 · 2026-08-07 15:56:42 +09:00
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+% [rec, rec_blocks] = FBP_deform(sinogram, cfg, vectors, varargin)
+% FUNCTION filtered back projection 
+% Inputs:
+%     sino - sinogram (Nlayers x width x Nangles)
+%     cfg - config struct from ASTRA_initialize
+%     vectors - vectors of projection rotation generated by ASTRA_initialize
+%     varargin - see the code 
+
+%*-----------------------------------------------------------------------*
+%|                                                                       |
+%|  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, rec_blocks] = FBP_deform(sinogram, cfg, vectors,  block_size, inv_deform_tensors, varargin )
+
+    par = inputParser;
+    par.KeepUnmatched = true; 
+    par.addOptional('valid_angles', [], @isnumeric)
+    par.addOptional('verbose', 1)   % verbose = 0 : quiet, verbose : standard info , verbose = 2: debug 
+
+    par.parse(varargin{:})
+    r = par.Results;
+        
+    Nblocks = length(inv_deform_tensors); 
+    Nangles = cfg.iProjAngles; 
+
+    if isempty(r.valid_angles)
+        r.valid_angles = 1:Nangles;
+    end
+
+    rec = 0; 
+    for ll = 1:Nblocks
+        if r.verbose ; utils.progressbar(ll, Nblocks); end
+        
+        ids = 1+(ll-1)*block_size:min(Nangles, ll*block_size); 
+        if ~isempty(r.valid_angles)
+            ids = intersect(ids, r.valid_angles); 
+        end
+        if isempty(ids)
+            continue
+        end
+        if isempty(inv_deform_tensors{ll})
+            warning('Empty inv_deform_tensors, skipping %i projections', length(ids))
+        end
+        rec_blocks{ll} = tomo.FBP(sinogram, cfg, vectors,'deformation_fields',inv_deform_tensors{ll}, varargin{:}, 'valid_angles', ids, 'verbose', 0);
+        rec  =  rec + rec_blocks{ll} * length(ids) / length(r.valid_angles);
+        if nargout == 1
+             rec_blocks{ll} = []; % save memory
+        end
+    end
+
+end
+
+
+
+