<html><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><div>Dear Akiko,</div><br><div><div>On May 4, 2011, at 3:17 PM, Akiko Ikkai wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite"><div>I sent a below message to the list last night, but it was bounced back. I'm trying from another email account. My apologies if this was duplicate... <br><br><br><br>I'm trying to run beamformer analysis on my MEG data, using DICS, and having difficulty visualizing meaningful results. <br><br>I was able to align MRI image to MEG sensors; after segmentation, ft_prepare_singleshell and ft_prepare_leadfield, plotting ft_data.grad and volume model confirms that they align reasonably. However, using data.grad, grid, and vol to run ft_sourceanalysis, and ft_sourceinterpolate with MRI (in ctf coordinate system and aligned to MEG sensors) somehow distorts the alignment, and the new volume model does not resemble the original. <br></div></blockquote><div><br></div>So, the problem is that ft_sourceinterpolate does not behave as expected?<br><div><br></div><blockquote type="cite"><div>I'm assuming that, after ft_sourceinterpolate, if I segment source_interpolated.anatomy and run ft_prepare_singleshell and ft_prepare_leadfield, it should align with MEG sensors, just as the initial volume model aligned with MEG sensors... or am I making too much of an assumption here? <font class="Apple-style-span" color="#000000"><font class="Apple-style-span" color="#144FAE"><br></font></font></div></blockquote><div><br></div>Why would you want to do this?<br><div><br></div><blockquote type="cite"><div>Because of the misalignment, output data of ft_sourceinterpolate with "anatomy" and "avg.pow" does not agree with topoplot (run ft_freqanalysis on the same dataset).<br></div></blockquote><blockquote type="cite"><div>If anyone could explain why this alignment distortion might be happening during ft_sourceanalysis and/or ft_sourceinterpolate, I'd really appreciate it.<br><br></div></blockquote><div><br></div><div>I am afraid you need to be a bit more specific in order for us to understand what may be going wrong here.</div><div><br></div><div>Best,</div><div><br></div><div>Jan-Mathijs</div><div><br></div><br><blockquote type="cite"><div>Thanks in advance, Akiko <br><br>-- <br>Akiko Ikkai, Ph.D. <br>Postdoctoral Fellow<br>Department of Psychological and Brain Sciences<br>Johns Hopkins University<br>Ames Hall, 3400 N. Charles St.<br>Baltimore, MD 21218<br>_______________________________________________<br>fieldtrip mailing list<br><a href="mailto:fieldtrip@donders.ru.nl">fieldtrip@donders.ru.nl</a><br>http://mailman.science.ru.nl/mailman/listinfo/fieldtrip<br></div></blockquote></div><br><div apple-content-edited="true"> <span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; font-size: medium; "><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-size: medium; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; "><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><div>Dr. J.M. (Jan-Mathijs) Schoffelen </div><div>Donders Institute for Brain, Cognition and Behaviour, <br>Centre for Cognitive Neuroimaging,<br>Radboud University Nijmegen, The Netherlands</div><div><a href="mailto:J.Schoffelen@donders.ru.nl">J.Schoffelen@donders.ru.nl</a></div><div>Telephone: 0031-24-3614793</div></div></span></div></span> </div><br></body></html>