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Hi Guilherme,</div>
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Thanks for the reply. There are a good number of negative values (~22.5%).</div>
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<span style="color: rgb(0, 0, 0); font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt;">Do you have any suggestions on what I can do to attenuate the artifacts? My main aim is to get the mean e-field for specific ROIs.</span></div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
<span style="color: rgb(0, 0, 0); font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt;">For instance, would you recommend the use of normJ instead? I notice that there are fewer negative values for normJ, and notably none in the ROIs I am interested
in. </span></div>
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<span style="color: rgb(0, 0, 0); font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt;"><br>
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<span style="color: rgb(0, 0, 0); font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt;">best regards,</span></div>
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<span style="color: rgb(0, 0, 0); font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt;">Jane</span></div>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Guilherme B Saturnino <guilhermebs@drcmr.dk><br>
<b>Sent:</b> Thursday, 19 March 2020 4:08 PM<br>
<b>To:</b> Jane Tan <Jane.Tan@murdoch.edu.au>; discuss@simnibs.org <discuss@simnibs.org><br>
<b>Subject:</b> Re: [Simnibs-discuss] normE values in MNI space</font>
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<p>Dear Jane,</p>
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<p>How many negative values are there? This is likely an artifact due to spline interpolation of the electric field from the original space to MNI space.</p>
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<p>Best Regards,</p>
<p>Guilherme</p>
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<div class="x_moz-cite-prefix">On 19/03/2020 06.06, Jane Tan wrote:<br>
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Hi SimNIBS Team,</div>
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<div style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)">
I found some negative values in my <span style="font-family:Calibri,Arial,Helvetica,sans-serif; background-color:rgb(255,255,255); display:inline!important">nifti volume for normE in MNI space, and I thought something must have gone awry during the segmentation
process for my head mesh (created <span style="font-family:Calibri,Arial,Helvetica,sans-serif; background-color:rgb(255,255,255); display:inline!important">using headreco (with cat) on a MNI152 T1-weighted image)</span>. However, the head mesh looks okay
when I checked it with gmsh. The headreco_log doesn't seem to indicate any issues either - at least not to my untrained eye. I do not have access to freeview, and couldn't do a proper check via headreco.</span></div>
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<span style="font-family:Calibri,Arial,Helvetica,sans-serif; background-color:rgb(255,255,255); display:inline!important"><br>
</span></div>
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<span style="font-family:Calibri,Arial,Helvetica,sans-serif; background-color:rgb(255,255,255); display:inline!important">I'm also wondering if it might be due to normE not being very accurate as a result of registration to the MNI template? </span></div>
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<span style="font-family:Calibri,Arial,Helvetica,sans-serif; background-color:rgb(255,255,255); display:inline!important"><br>
</span></div>
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<span style="font-family:Calibri,Arial,Helvetica,sans-serif; background-color:rgb(255,255,255); display:inline!important">Your suggestions would be greatly appreciated. I am happy to provide my head mesh and segmentation results if that would be of any help.</span></div>
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<span style="font-family:Calibri,Arial,Helvetica,sans-serif; background-color:rgb(255,255,255); display:inline!important"><br>
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<span style="font-family:Calibri,Arial,Helvetica,sans-serif; background-color:rgb(255,255,255); display:inline!important">best regards,</span></div>
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Jane</div>
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<p class="x_MsoNormal" style="margin-top:0px; margin-bottom:0px"><span lang="EN-SG" style="">Best regards,</span></p>
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<p class="x_MsoNormal" style="margin-top:0px; margin-bottom:0px"><span lang="EN-SG" style="">Jane</span></p>
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