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function proj_geom = astra_create_proj_geom(type, varargin)
%--------------------------------------------------------------------------
% proj_geom = astra_create_proj_geom('parallel', det_width, det_count, angles)
%
% Create a 2D parallel beam geometry. See the API for more information.
% det_width: distance between two adjacent detectors
% det_count: number of detectors in a single projection
% angles: projection angles in radians, should be between -pi/4 and 7pi/4
% proj_geom: MATLAB struct containing all information of the geometry
%--------------------------------------------------------------------------
% proj_geom = astra_create_proj_geom('parallel3d', det_spacing_x, det_spacing_y, det_row_count, det_col_count, angles)
%
% Create a 3D parallel beam geometry. See the API for more information.
% det_spacing_x: distance between two horizontally adjacent detectors
% det_spacing_y: distance between two vertically adjacent detectors
% det_row_count: number of detector rows in a single projection
% det_col_count: number of detector columns in a single projection
% angles: projection angles in radians, should be between -pi/4 and 7pi/4
% proj_geom: MATLAB struct containing all information of the geometry
%--------------------------------------------------------------------------
% proj_geom = astra_create_proj_geom('fanflat', det_width, det_count, angles, source_origin, origin_det)
%
% Create a 2D flat fan beam geometry. See the API for more information.
% det_width: distance between two adjacent detectors
% det_count: number of detectors in a single projection
% angles: projection angles in radians, should be between -pi/4 and 7pi/4
% source_origin: distance between the source and the center of rotation
% origin_det: distance between the center of rotation and the detector array
% proj_geom: MATLAB struct containing all information of the geometry
%--------------------------------------------------------------------------
% proj_geom = astra_create_proj_geom('fanflat_vec', det_count, vectors)
%
% Create a 2D flat fan beam geometry specified by 2D vectors.
% See the API for more information.
% det_count: number of detectors in a single projection
% vectors: a matrix containing the actual geometry. Each row corresponds
% to a single projection, and consists of:
% ( srcX, srcY, dX, dY, uX, uY )
% src: the ray source
% d : the center of the detector
% u : the vector from detector pixel 0 to 1
% proj_geom: MATLAB struct containing all information of the geometry
%--------------------------------------------------------------------------
% proj_geom = astra_create_proj_geom('cone', det_spacing_x, det_spacing_y, det_row_count, det_col_count, angles, source_origin, origin_det)
%
% Create a 3D cone beam geometry. See the API for more information.
% det_spacing_x: distance between two horizontally adjacent detectors
% det_spacing_y: distance between two vertically adjacent detectors
% det_row_count: number of detector rows in a single projection
% det_col_count: number of detector columns in a single projection
% angles: projection angles in radians, should be between -pi/4 and 7pi/4
% source_origin: distance between the source and the center of rotation
% origin_det: distance between the center of rotation and the detector array
% proj_geom: MATLAB struct containing all information of the geometry
%--------------------------------------------------------------------------
% proj_geom = astra_create_proj_geom('cone_vec', det_row_count, det_col_count, vectors)
%
% Create a 3D cone beam geometry specified by 3D vectors.
% See the API for more information.
% det_row_count: number of detector rows in a single projection
% det_col_count: number of detector columns in a single projection
% vectors: a matrix containing the actual geometry. Each row corresponds
% to a single projection, and consists of:
% ( srcX, srcY, srcZ, dX, dY, dZ, uX, uY, uZ, vX, vY, vZ )
% src: the ray source
% d : the center of the detector
% u : the vector from detector pixel (0,0) to (0,1)
% v : the vector from detector pixel (0,0) to (1,0)
% proj_geom: MATLAB struct containing all information of the geometry
%--------------------------------------------------------------------------
% proj_geom = astra_create_proj_geom('parallel3d_vec', det_row_count, det_col_count, vectors)
%
% Create a 3D parallel beam geometry specified by 3D vectors.
% See the API for more information.
% det_row_count: number of detector rows in a single projection
% det_col_count: number of detector columns in a single projection
% vectors: a matrix containing the actual geometry. Each row corresponds
% to a single projection, and consists of:
% ( rayX, rayY, rayZ, dX, dY, dZ, uX, uY, uZ, vX, vY, vZ )
% ray: the ray direction
% d : the center of the detector
% u : the vector from detector pixel (0,0) to (0,1)
% v : the vector from detector pixel (0,0) to (1,0)
% proj_geom: MATLAB struct containing all information of the geometry
%--------------------------------------------------------------------------
%--------------------------------------------------------------------------
% This file is part of the ASTRA Toolbox
%
% Copyright: 2010-2021, imec Vision Lab, University of Antwerp
% 2014-2021, CWI, Amsterdam
% License: Open Source under GPLv3
% Contact: astra@astra-toolbox.com
% Website: http://www.astra-toolbox.com/
%--------------------------------------------------------------------------
if strcmp(type,'parallel')
if numel(varargin) < 3
error('not enough variables: astra_create_proj_geom(parallel, detector_spacing, det_count, angles)');
end
proj_geom = struct( ...
'type', 'parallel', ...
'DetectorWidth', varargin{1}, ...
'DetectorCount', varargin{2}, ...
'ProjectionAngles', varargin{3} ...
);
elseif strcmp(type,'parallel_vec')
if numel(varargin) < 2
error('not enough variables: astra_create_proj_geom(parallel_vec, det_count, V')
end
if size(varargin{2}, 2) ~= 6
error('V should be a Nx6 matrix, with N the number of projections')
end
proj_geom = struct( ...
'type', 'parallel_vec', ...
'DetectorCount', varargin{1}, ...
'Vectors', varargin{2} ...
);
elseif strcmp(type,'fanflat')
if numel(varargin) < 5
error('not enough variables: astra_create_proj_geom(fanflat, det_width, det_count, angles, source_origin, source_det)');
end
proj_geom = struct( ...
'type', 'fanflat', ...
'DetectorWidth', varargin{1}, ...
'DetectorCount', varargin{2}, ...
'ProjectionAngles', varargin{3}, ...
'DistanceOriginSource', varargin{4}, ...
'DistanceOriginDetector', varargin{5} ...
);
elseif strcmp(type,'fanflat_vec')
if numel(varargin) < 2
error('not enough variables: astra_create_proj_geom(fanflat_vec, det_count, V')
end
if size(varargin{2}, 2) ~= 6
error('V should be a Nx6 matrix, with N the number of projections')
end
proj_geom = struct( ...
'type', 'fanflat_vec', ...
'DetectorCount', varargin{1}, ...
'Vectors', varargin{2} ...
);
elseif strcmp(type,'parallel3d')
if numel(varargin) < 5
error('not enough variables: astra_create_proj_geom(parallel3d, detector_spacing_x, detector_spacing_y, det_row_count, det_col_count, angles)');
end
proj_geom = struct( ...
'type', 'parallel3d', ...
'DetectorSpacingX', varargin{1}, ...
'DetectorSpacingY', varargin{2}, ...
'DetectorRowCount', varargin{3}, ...
'DetectorColCount', varargin{4}, ...
'ProjectionAngles', varargin{5} ...
);
elseif strcmp(type,'cone')
if numel(varargin) < 7
error('not enough variables: astra_create_proj_geom(cone, detector_spacing_x, detector_spacing_y, det_row_count, det_col_count, angles, source_origin, source_det)');
end
proj_geom = struct( ...
'type', 'cone', ...
'DetectorSpacingX', varargin{1}, ...
'DetectorSpacingY', varargin{2}, ...
'DetectorRowCount', varargin{3}, ...
'DetectorColCount', varargin{4}, ...
'ProjectionAngles', varargin{5}, ...
'DistanceOriginSource', varargin{6}, ...
'DistanceOriginDetector',varargin{7} ...
);
elseif strcmp(type,'cone_vec')
if numel(varargin) < 3
error('not enough variables: astra_create_proj_geom(cone_vec, det_row_count, det_col_count, V')
end
if size(varargin{3}, 2) ~= 12
error('V should be a Nx12 matrix, with N the number of projections')
end
proj_geom = struct( ...
'type', 'cone_vec', ...
'DetectorRowCount', varargin{1}, ...
'DetectorColCount', varargin{2}, ...
'Vectors', varargin{3} ...
);
elseif strcmp(type,'parallel3d_vec')
if numel(varargin) < 3
error('not enough variables: astra_create_proj_geom(parallel3d_vec, det_row_count, det_col_count, V')
end
if size(varargin{3}, 2) ~= 12
error('V should be a Nx12 matrix, with N the number of projections')
end
proj_geom = struct( ...
'type', 'parallel3d_vec', ...
'DetectorRowCount', varargin{1}, ...
'DetectorColCount', varargin{2}, ...
'Vectors', varargin{3} ...
);
elseif strcmp(type,'sparse_matrix')
if numel(varargin) < 3
error('not enough variables: astra_create_proj_geom(sparse_matrix, det_width, det_count, angles, matrix_id)')
end
proj_geom = struct( ...
'type', 'sparse_matrix', ...
'DetectorWidth', varargin{1}, ...
'DetectorCount', varargin{2}, ...
'ProjectionAngles', varargin{3}, ...
'MatrixID', varargin{4} ...
);
else
disp(['Error: unknown type ' type]);
proj_geom = struct();
end
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