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ctf_write_headshape.m
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ctf_write_headshape.m
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function ctf_write_headshape(HeadShape,mri,file)
% ctf_write_headshape - write a CTF .shape file
%
% ctf_write_headshape(HeadShape,mri,file)
%
% - HeadShape is Nx3 list of coordinates in the CTF head shape coordinates.
% - mri is a struct returned by ctf_read_mri; if it is empty, this function
% will prompt with a file browser and read in the file identified. The mri
% struct contains the mri.file field, which is used to define the name of
% the .shape and the .shape_info output files (unless the optional 'file'
% input is given). Also, the fiducials and other information in this
% struct are required to output the .shape_info file. The .shape and
% .shape_info files are required to import the data into CTF's MRIViewer.
%
% The *.shape file is an ascii text file in the following format:
%
% Number of Points
% x1 y1 z1
% x2 y2 z2
% .
% .
% .
% xn yn zn
%
% These vertex coordinates are contained in the input HeadShape
% matrix (Nx3). The coordinate values must be in centimeters in
% either the voxel MRI coordinate system or the MEG Head Coordinate
% System (see ctf_read_mri for more about the coordinate system).
%
% This function assumes the MEG head coordinate system is required.
% The values in the input HeadShape matrix (Nx3) should be in
% centimeteres, with the column values representing X, Y, Z, such
% that +X is toward the nasion, +Y is left preauricular and +Z is
% superior. The values are given with respect to the origin, which
% lies half way between the left and right preauricular fiducials. It is
% essential that the fiducials are defined and saved in the .mri file for
% this function to operate correctly.
%
% see also ctf_write_mrishape ctf_read_mri ctf_mri2head ctf_head2mri
%
% $Revision: 1.1 $ $Date: 2009-01-30 03:49:27 $
% Copyright (C) 2004 Darren L. Weber
%
% This program is free software; you can redistribute it and/or
% modify it under the terms of the GNU General Public License
% as published by the Free Software Foundation; either version 2
% of the License, or (at your option) any later version.
%
% This program is distributed in the hope that it will be useful,
% but WITHOUT ANY WARRANTY; without even the implied warranty of
% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
% GNU General Public License for more details.
%
% You should have received a copy of the GNU General Public License
% along with this program; if not, write to the Free Software
% Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
% History: 02/2004, Darren.Weber_at_radiology.ucsf.edu
% - adapted from an appendex to CTF document
% MRIViewer.pdf
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
ver = '[$Revision: 1.1 $]';
fprintf('CTF_WRITE_HEADSHAPE [v%s]\n',ver(12:16)); tic;
%--------------------------------------------------
% check the mri input variable
if exist('mri','var'),
if isfield(mri,'file'),
% great!
else
fprintf('...cannot find mri.file\n');
[fileName, filePath] = uigetfile('*.mri', 'Pick a CTF .mri file');
mri.file = fullfile(filePath,fileName);
mri = ctf_read_mri(mri.file);
end
else
[fileName, filePath] = uigetfile('*.mri', 'Pick a CTF .mri file');
mri.file = fullfile(filePath,fileName);
mri = ctf_read_mri(mri.file);
end
if exist('file','var'),
shapeFile = file;
else
shapeFile = [mri.file,'.head.shape'];
end
shapeInfoFile = [shapeFile,'_info'];
%--------------------------------------------------
% output the .shape file
fid = fopen(shapeFile,'w');
if isequal(fid,-1),
S=sprintf('Could not open file: "%s"',shapeFile);
error(S);
else
fprintf('...writing to file:\n %s\n',shapeFile);
fprintf('...writing CTF .shape file, with head coordinates\n');
tic;
% Write vertices
Nvertices = size(HeadShape,1);
fprintf(fid,'%d\n',Nvertices);
for v = 1:Nvertices,
fprintf(fid,'%6.3f %6.3f %6.3f\n',HeadShape(v,1),HeadShape(v,2),HeadShape(v,3));
end
fclose(fid);
t = toc;
fprintf('...done (%6.2f sec).\n',t);
end
%--------------------------------------------------
% output the .shape_info file
fid = fopen(shapeInfoFile,'w');
if isequal(fid,-1),
S=sprintf('Could not open file: "%s"',shapeInfoFile);
error(S);
else
fprintf('...writing to file:\n %s\n',shapeInfoFile);
fprintf('...writing CTF .shape_info file, with head coordinates\n');
tic;
[mriFilePath,mriFileName,mriFileExt] = fileparts(mri.file);
nasion = [ mri.hdr.HeadModel_Info.Nasion_Sag, mri.hdr.HeadModel_Info.Nasion_Cor, mri.hdr.HeadModel_Info.Nasion_Axi ];
left = [ mri.hdr.HeadModel_Info.LeftEar_Sag, mri.hdr.HeadModel_Info.LeftEar_Cor, mri.hdr.HeadModel_Info.LeftEar_Axi ];
right = [ mri.hdr.HeadModel_Info.RightEar_Sag, mri.hdr.HeadModel_Info.RightEar_Cor, mri.hdr.HeadModel_Info.RightEar_Axi ];
fprintf(fid,'// *************************************\n');
fprintf(fid,'// Headshape File Information \n');
fprintf(fid,'// *************************************\n');
fprintf(fid,'\n');
fprintf(fid,'MRI_Info\n');
fprintf(fid,'{\n');
fprintf(fid,' VERSION: 1.00\n');
fprintf(fid,'\n');
fprintf(fid,' FILENAME: %s\n',[mriFileName,mriFileExt]);
fprintf(fid,'\n');
fprintf(fid,' // Fid. Points Sag Cor Axi\n');
fprintf(fid,' NASION:\t\t\t%5.1f %5.1f %5.1f\n',nasion(1),nasion(2),nasion(3));
fprintf(fid,' LEFT_EAR:\t\t%5.1f %5.1f %5.1f\n',left(1),left(2),left(3));
fprintf(fid,' RIGHT_EAR:\t%5.1f %5.1f %5.1f\n',right(1),right(2),right(3));
fprintf(fid,'\n');
fprintf(fid,' MM_PER_VOXEL_SAGITTAL:\t\t%10.8f\n', mri.hdr.mmPerPixel_sagittal);
fprintf(fid,' MM_PER_VOXEL_CORONAL:\t\t%10.8f\n', mri.hdr.mmPerPixel_coronal);
fprintf(fid,' MM_PER_VOXEL_AXIAL:\t\t\t%10.8f\n', mri.hdr.mmPerPixel_axial);
fprintf(fid,'\n');
fprintf(fid,' COORDINATES: HEAD\n');
fprintf(fid,'\n');
fprintf(fid,'}\n');
fclose(fid);
t = toc;
fprintf('...done (%6.2f sec).\n\n',t);
end
return
%// *************************************
%// Headshape File Information
%// *************************************
%
%MRI_Info
%{
% VERSION: 1.00
%
% FILENAME: ucsf_mh_orig_axial_las2ctf.mri
%
% // Fid. Points Sag Cor Axi
% NASION: 128.0 35.0 130.0
% LEFT_EAR: 53.0 123.0 152.0
% RIGHT_EAR: 207.0 123.0 152.0
%
% MM_PER_VOXEL_SAGITTAL: 1.00000000
% MM_PER_VOXEL_CORONAL: 1.00000000
% MM_PER_VOXEL_AXIAL: 1.00000000
%
% COORDINATES: MRI
%
%}