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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"                "http://www.w3.org/TR/REC-html40/loose.dtd"><html><head>  <title>Description of tal2mni</title>  <meta name="keywords" content="tal2mni">  <meta name="description" content="TAL2MNI - Talairach to MNI coordinates">  <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">  <meta name="generator" content="m2html &copy; 2003 Guillaume Flandin">  <meta name="robots" content="index, follow">  <link type="text/css" rel="stylesheet" href="../m2html.css"></head><body><a name="_top"></a><div><a href="../index.html">Home</a> &gt;  <a href="index.html">mri_toolbox</a> &gt; tal2mni.m</div><!--<table width="100%"><tr><td align="left"><a href="../index.html"><img alt="<" border="0" src="../left.png">&nbsp;Master index</a></td><td align="right"><a href="index.html">Index for mri_toolbox&nbsp;<img alt=">" border="0" src="../right.png"></a></td></tr></table>--><h1>tal2mni</h1><h2><a name="_name"></a>PURPOSE <a href="#_top"><img alt="^" border="0" src="../up.png"></a></h2><div class="box"><strong>TAL2MNI - Talairach to MNI coordinates</strong></div><h2><a name="_synopsis"></a>SYNOPSIS <a href="#_top"><img alt="^" border="0" src="../up.png"></a></h2><div class="box"><strong>function outpoints = tal2mni(inpoints) </strong></div><h2><a name="_description"></a>DESCRIPTION <a href="#_top"><img alt="^" border="0" src="../up.png"></a></h2><div class="fragment"><pre class="comment"> TAL2MNI - Talairach to MNI coordinates
 
 outpoints = tal2mni(inpoints)
 
 inpoints  - Nx3 or 3xN matrix of coordinates
             (N being the number of points)
 
 outpoints - the coordinate matrix with MNI points
 
 See also, <a href="mni2tal.html" class="code" title="function outpoints = mni2tal(inpoints)">MNI2TAL</a> &amp; the best guess discussion at http://www.mrc-cbu.cam.ac.uk/Imaging/mnispace.html</pre></div><!-- crossreference --><h2><a name="_cross"></a>CROSS-REFERENCE INFORMATION <a href="#_top"><img alt="^" border="0" src="../up.png"></a></h2>This function calls:<ul style="list-style-image:url(../matlabicon.gif)"><li><a href="mni2tal_matrix.html" class="code" title="function M2T = mni2tal_matrix()">mni2tal_matrix</a>	MNI2TAL_MATRIX - Talairach to MNI coordinates (best guess)</li></ul>This function is called by:<ul style="list-style-image:url(../matlabicon.gif)"></ul><!-- crossreference --><h2><a name="_source"></a>SOURCE CODE <a href="#_top"><img alt="^" border="0" src="../up.png"></a></h2><div class="fragment"><pre>0001 <a name="_sub0" href="#_subfunctions" class="code">function outpoints = tal2mni(inpoints)</a>0002 0003 <span class="comment">% TAL2MNI - Talairach to MNI coordinates</span>0004 <span class="comment">%</span>0005 <span class="comment">% outpoints = tal2mni(inpoints)</span>0006 <span class="comment">%</span>0007 <span class="comment">% inpoints  - Nx3 or 3xN matrix of coordinates</span>0008 <span class="comment">%             (N being the number of points)</span>0009 <span class="comment">%</span>0010 <span class="comment">% outpoints - the coordinate matrix with MNI points</span>0011 <span class="comment">%</span>0012 <span class="comment">% See also, MNI2TAL &amp; the best guess discussion at</span>0013 <span class="comment">% http://www.mrc-cbu.cam.ac.uk/Imaging/mnispace.html</span>0014 <span class="comment">%</span>0015 0016 <span class="comment">% $Revision: 1.5 $ $Date: 2004/02/07 01:41:51 $</span>0017 0018 <span class="comment">% Licence:  GNU GPL, no express or implied warranties</span>0019 <span class="comment">% Matthew Brett 2/2/01, matthew.brett@mrc-cbu.cam.ac.uk</span>0020 <span class="comment">% modified 02/2003, Darren.Weber_at_radiology.ucsf.edu</span>0021 <span class="comment">%                   - swapped inv() for slash equivalent</span>0022 <span class="comment">%                   - removed dependence on spm_matrix</span>0023 <span class="comment">%</span>0024 <span class="comment">%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%</span>0025 0026 dimdim = find(size(inpoints) == 3);0027 <span class="keyword">if</span> isempty(dimdim),0028     error(<span class="string">'input must be a Nx3 or 3xN matrix'</span>)0029 <span class="keyword">end</span>0030 <span class="keyword">if</span> dimdim == 2,0031     inpoints = inpoints';0032 <span class="keyword">end</span>0033 0034 <span class="comment">% Transformation matrices, different zooms above/below AC</span>0035 M2T = <a href="mni2tal_matrix.html" class="code" title="function M2T = mni2tal_matrix()">mni2tal_matrix</a>;0036 0037 inpoints = [inpoints; ones(1, size(inpoints, 2))];0038 0039 tmp = inpoints(3,:) &lt; 0;  <span class="comment">% 1 if below AC</span>0040 0041 inpoints(:,  tmp) = (M2T.rotn * M2T.downZ) \ inpoints(:,  tmp);0042 inpoints(:, ~tmp) = (M2T.rotn * M2T.upZ  ) \ inpoints(:, ~tmp);0043 0044 outpoints = inpoints(1:3, :);0045 <span class="keyword">if</span> dimdim == 2,0046     outpoints = outpoints';0047 <span class="keyword">end</span>0048 0049 <span class="keyword">return</span></pre></div><hr><address>Generated on Fri 21-May-2004 12:38:21 by <strong><a href="http://www.artefact.tk/software/matlab/m2html/">m2html</a></strong> &copy; 2003</address></body></html>
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