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<div style="direction: ltr;font-family: Tahoma;color: #000000;font-size: 10pt;">Hi all,
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<div>I'm having some difficulty restricting source statistics to a region of interest.</div>
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<div>I am running the ft_sourcestatistics with the following cfg for ROI:</div>
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<div><font color="#808080">cfg.atlas = ft_read_atlas('~/MATLAB/fieldtrip-20140910/template/atlas/aal/ROI_MNI_V4.nii')</font></div>
<div><font color="#808080">cfg.roi ={-5,0,3}; </font></div>
<div><font color="#808080">cfg.sphere=3;</font></div>
<div><font color="#808080">cfg.inputcoord = 'mni';</font></div>
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<div>This results in the following error:</div>
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<div><font color="#ff0000">Error using ft_volumelookup (line 131)</font></div>
<div><font color="#ff0000">either specify cfg.sphere or cfg.box</font></div>
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</font></div>
<div><font color="#ff0000">Error in statistics_wrapper (line 140)</font></div>
<div><font color="#ff0000"> tmp = ft_volumelookup(tmpcfg, varargin{1});</font></div>
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</font></div>
<div><font color="#ff0000">Error in ft_sourcestatistics (line 112)</font></div>
<div><font color="#ff0000"> [stat, cfg] = statistics_wrapper(cfg, varargin{:});</font></div>
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<div>I had understood that this should have chosen the grid position (-5, 0, 3) and then then selected grid points within a 3cm radius around this point as the ROI. These variables are just for trying it out, and are not what I will be using once I get this
code working.</div>
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<div>Any help much appreciated.</div>
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<div>P.s. I had thought that the following code would return anatomical labels for this ROI. Instead it just returns a matrix of zeros with the dimensions of source.dim.</div>
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<div><font color="#808080">cfg = [];</font></div>
<div><font color="#808080">cfg.atlas = atlas;</font></div>
<div><font color="#808080">cfg.inputcoord = 'mni';</font></div>
<div><font color="#808080">cfg.roi ={-5,0,3};</font></div>
<div><font color="#808080">cfg.sphere=3;</font></div>
<div><font color="#808080">labels = ft_volumelookup( cfg, sourceData)</font></div>
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<div>Again, any help will be much appreciated!</div>
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<div>Regards,</div>
<div>Kaelasha Tyler</div>
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