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Hi Kirandeep,
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<div class="">It seems that there’s something not entirely right with the computation of the localspheres model. Is there a particular reason why you want to use a localspheres forward solution, rather than the singleshell?</div>
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<div class="">Best wishes,</div>
<div class="">Jan-Mathijs</div>
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<blockquote type="cite" class="">
<div class="">On 27 Jun 2022, at 20:28, Kirandeep Kaur via fieldtrip <<a href="mailto:fieldtrip@science.ru.nl" class="">fieldtrip@science.ru.nl</a>> wrote:</div>
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<div dir="ltr" class="">Dear all, I am relatively new to fieldtrip, so any help would be greatly appreciated!
<div class="">I am trying to construct a source model using the following code from a MEG co-registered MRI. </div>
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<div class="">%% starting from segmentation</div>
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<div style="margin: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-stretch: normal; font-size: 10px; line-height: normal; font-family: Courier; color: rgb(2, 128, 9);" class="">
%% segment mri<span class="gmail-Apple-converted-space"> </span></div>
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cfg = [];</div>
<div style="margin: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-stretch: normal; font-size: 10px; line-height: normal; font-family: Courier;" class="">
cfg.tissue = <span class="gmail-s1" style="color:rgb(170,4,249)">'brain'</span>;</div>
<div style="margin: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-stretch: normal; font-size: 10px; line-height: normal; font-family: Courier;" class="">
cfg.spmversion = <span class="gmail-s1" style="color:rgb(170,4,249)">'spm12'</span>;</div>
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seg = ft_volumesegment(cfg, mri_realigned);</div>
<p class="gmail-p3" style="margin:0px;font-variant-numeric:normal;font-variant-east-asian:normal;font-stretch:normal;font-size:10px;line-height:normal;font-family:Courier;min-height:12px">
<span class="gmail-Apple-converted-space"> </span><br class="webkit-block-placeholder">
</p>
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save (<span class="gmail-s1" style="color:rgb(170,4,249)">'seg'</span>);<span class="gmail-Apple-converted-space"> </span></div>
<p class="gmail-p3" style="margin:0px;font-variant-numeric:normal;font-variant-east-asian:normal;font-stretch:normal;font-size:10px;line-height:normal;font-family:Courier;min-height:12px">
<span class="gmail-Apple-converted-space"> </span><br class="webkit-block-placeholder">
</p>
<div style="margin: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-stretch: normal; font-size: 10px; line-height: normal; font-family: Courier; color: rgb(2, 128, 9);" class="">
% cfg = [];</div>
<div style="margin: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-stretch: normal; font-size: 10px; line-height: normal; font-family: Courier;" class="">
cfg.tissue = <span class="gmail-s1" style="color:rgb(170,4,249)">'brain'</span>;</div>
<div style="margin: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-stretch: normal; font-size: 10px; line-height: normal; font-family: Courier;" class="">
cfg.spmversion = <span class="gmail-s1" style="color:rgb(170,4,249)">'spm12'</span>;</div>
<div style="margin: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-stretch: normal; font-size: 10px; line-height: normal; font-family: Courier;" class="">
brain_mesh = ft_prepare_mesh(cfg, seg);</div>
<p class="gmail-p3" style="margin:0px;font-variant-numeric:normal;font-variant-east-asian:normal;font-stretch:normal;font-size:10px;line-height:normal;font-family:Courier;min-height:12px">
<span class="gmail-Apple-converted-space"> </span><br class="webkit-block-placeholder">
</p>
<div style="margin: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-stretch: normal; font-size: 10px; line-height: normal; font-family: Courier;" class="">
cfg = [];</div>
<div style="margin: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-stretch: normal; font-size: 10px; line-height: normal; font-family: Courier; color: rgb(2, 128, 9);" class="">
<span class="gmail-s2" style="">cfg.method = </span><span class="gmail-s1" style="color:rgb(170,4,249)">'localspheres'</span><span class="gmail-s2" style="">; </span></div>
<div style="margin: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-stretch: normal; font-size: 10px; line-height: normal; font-family: Courier;" class="">
cfg.grad = data.grad;<span class="gmail-Apple-converted-space"> </span></div>
<div style="margin: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-stretch: normal; font-size: 10px; line-height: normal; font-family: Courier;" class="">
headmodel = ft_prepare_headmodel(cfg, brain_mesh);</div>
<p class="gmail-p3" style="margin:0px;font-variant-numeric:normal;font-variant-east-asian:normal;font-stretch:normal;font-size:10px;line-height:normal;font-family:Courier;min-height:12px">
<span class="gmail-Apple-converted-space"> </span><br class="webkit-block-placeholder">
</p>
<div style="margin: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-stretch: normal; font-size: 10px; line-height: normal; font-family: Courier; color: rgb(170, 4, 249);" class="">
<span class="gmail-s2" style="">save (</span>'headmodel'<span class="gmail-s2" style="">)</span></div>
<div style="margin: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-stretch: normal; font-size: 10px; line-height: normal; font-family: Courier;" class="">
clear <span class="gmail-s1" style="color:rgb(170,4,249)">seg</span><span class="gmail-Apple-converted-space"> </span></div>
<p class="gmail-p3" style="margin:0px;font-variant-numeric:normal;font-variant-east-asian:normal;font-stretch:normal;font-size:10px;line-height:normal;font-family:Courier;min-height:12px">
<span class="gmail-Apple-converted-space"> </span><br class="webkit-block-placeholder">
</p>
<div style="margin: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-stretch: normal; font-size: 10px; line-height: normal; font-family: Courier; color: rgb(2, 128, 9);" class="">
%% construction of source model<span class="gmail-Apple-converted-space"> </span></div>
<div style="margin: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-stretch: normal; font-size: 10px; line-height: normal; font-family: Courier;" class="">
cfg = [];</div>
<div style="margin: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-stretch: normal; font-size: 10px; line-height: normal; font-family: Courier; color: rgb(2, 128, 9);" class="">
<span class="gmail-s2" style="">cfg.resolution = 0.005; </span></div>
<div style="margin: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-stretch: normal; font-size: 10px; line-height: normal; font-family: Courier;" class="">
cfg.unit = <span class="gmail-s1" style="color:rgb(170,4,249)">'m'</span>;</div>
<div style="margin: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-stretch: normal; font-size: 10px; line-height: normal; font-family: Courier;" class="">
cfg.headmodel = headmodel;</div>
<div style="margin: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-stretch: normal; font-size: 10px; line-height: normal; font-family: Courier;" class="">
cfg.grad = data.grad;</div>
<div style="margin: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-stretch: normal; font-size: 10px; line-height: normal; font-family: Courier;" class="">
sourcemodel = ft_prepare_sourcemodel(cfg);</div>
<p class="gmail-p3" style="margin:0px;font-variant-numeric:normal;font-variant-east-asian:normal;font-stretch:normal;font-size:10px;line-height:normal;font-family:Courier;min-height:12px">
<span class="gmail-Apple-converted-space"> </span><br class="webkit-block-placeholder">
</p>
<div style="margin: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-stretch: normal; font-size: 10px; line-height: normal; font-family: Courier; color: rgb(170, 4, 249);" class="">
<span class="gmail-s2" style="">save (</span>'sourcemodel'<span class="gmail-s2" style="">)<span class="gmail-Apple-converted-space"> </span></span></div>
<div style="margin: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-stretch: normal; font-size: 10px; line-height: normal; font-family: Courier; color: rgb(170, 4, 249);" class="">
<span class="gmail-s2" style=""><span class="gmail-Apple-converted-space"><br class="">
</span></span></div>
<div style="margin: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-stretch: normal; line-height: normal;" class="">
<font style="" face="arial, sans-serif" class="">------------------------------------------------------</font></div>
<div style="margin: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-stretch: normal; line-height: normal;" class="">
<font style="" face="arial, sans-serif" class=""><br class="">
</font></div>
<div style="margin: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-stretch: normal; line-height: normal;" class="">
<font style="" face="arial, sans-serif" class=""><br class="">
</font></div>
<div style="margin: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-stretch: normal; line-height: normal;" class="">
<font style="" face="arial, sans-serif" class="">This code runs well up to the construction of the head model, but I get the following error while trying to make the source-model (a screenshot of the same is attached). When I run this code using 'singleshell'
head model instead of 'localsheres' it works just fine. </font></div>
<div style="margin: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-stretch: normal; line-height: normal;" class="">
<font style="" face="arial, sans-serif" class=""><br class="">
</font></div>
<div style="margin: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-stretch: normal; line-height: normal;" class="">
<font style="" face="arial, sans-serif" class=""><br class="">
</font></div>
<div style="margin: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-stretch: normal; line-height: normal;" class="">
<font style="" face="arial, sans-serif" class="">----------------------------------------------------------</font></div>
<div style="margin: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-stretch: normal; line-height: normal;" class="">
Error using headsurface (line 155)<br class="">
there should be just as many spheres as coils<br class="">
<br class="">
Error in ft_prepare_sourcemodel (line 380)<br class="">
pos = headsurface(headmodel, sens);<font style="" face="arial, sans-serif" class=""><br class="">
</font></div>
<div style="margin: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-stretch: normal; line-height: normal;" class="">
-----------------------------------------------------------</div>
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<div style="margin: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-stretch: normal; line-height: normal;" class="">
Could anyone suggest how to resolve this. Thanks a lot! </div>
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<div style="margin: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-stretch: normal; line-height: normal;" class="">
Kind regards </div>
<div style="margin: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-stretch: normal; line-height: normal;" class="">
Kirandeep Kaur </div>
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<span class="gmail-s2" style=""><span class="gmail-Apple-converted-space"><br class="">
</span></span></div>
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<span id="cid:f_l4x2plqe0"><Screenshot 2022-06-26 at 11.45.21 PM.png></span>_______________________________________________<br class="">
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