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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 avw_paint</title> <meta name="keywords" content="avw_paint"> <meta name="description" content="script to test vertex to voxel coordinate mapping"> <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"> <meta name="generator" content="m2html © 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> > <a href="index.html">mri_toolbox</a> > avw_paint.m</div><!--<table width="100%"><tr><td align="left"><a href="../index.html"><img alt="<" border="0" src="../left.png"> Master index</a></td><td align="right"><a href="index.html">Index for mri_toolbox <img alt=">" border="0" src="../right.png"></a></td></tr></table>--><h1>avw_paint</h1><h2><a name="_name"></a>PURPOSE <a href="#_top"><img alt="^" border="0" src="../up.png"></a></h2><div class="box"><strong>script to test vertex to voxel coordinate mapping</strong></div><h2><a name="_synopsis"></a>SYNOPSIS <a href="#_top"><img alt="^" border="0" src="../up.png"></a></h2><div class="box"><strong>This is a script file. </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"> script to test vertex to voxel coordinate mapping</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="avw_center.html" class="code" title="function center = avw_center(avw)">avw_center</a> avw_center - find center of a volume</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 0002 0003 <span class="comment">% script to test vertex to voxel coordinate mapping</span>0004 0005 0006 origin = <a href="avw_center.html" class="code" title="function center = avw_center(avw)">avw_center</a>(avw);0007 0008 xo = origin.abs.mm(1);0009 yo = origin.abs.mm(2);0010 zo = origin.abs.mm(3);0011 0012 <span class="comment">% Find direction cosines for line from origin to nasion</span>0013 x = 0 + xo;0014 y = 100 + yo;0015 z = 0 + zo;0016 r = sqrt( (x-xo).^2 + (y-yo).^2 + (z-zo).^2 );0017 l = (x-xo)/r; <span class="comment">% cos alpha</span>0018 m = (y-yo)/r; <span class="comment">% cos beta</span>0019 n = (z-zo)/r; <span class="comment">% cos gamma</span>0020 0021 <span class="comment">% find discrete points from origin to the vertex + 25%</span>0022 POINTS = 250;0023 PERCENT = 0.25;0024 RMIN = 0;0025 rmax = r + (r * PERCENT);0026 radial_distances = linspace(RMIN,rmax,POINTS);0027 0028 L = repmat(l,1,POINTS);0029 M = repmat(m,1,POINTS);0030 N = repmat(n,1,POINTS);0031 0032 XI = (L .* radial_distances) + xo;0033 YI = (M .* radial_distances) + yo;0034 ZI = (N .* radial_distances) + zo;0035 0036 <span class="comment">% interpolate volume values at these points ( XI,YI are swapped here</span>0037 <span class="comment">% because the Analyze volume is a left handed coordinate system )</span>0038 VI = interp3(vol,YI,XI,ZI,<span class="string">'*nearest'</span>);0039 0040 <span class="comment">% Find the intensity values in this array that approximate</span>0041 <span class="comment">% the scalp</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> © 2003</address></body></html>⌨️ 快捷键说明
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