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Hi Pin-Chun
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<div class="">Just to be sure: it’s not the ’tip of the nose’ that needs to be visible, but the ’nasion’ which is the point at the lower end of the forehead where the nose starts protruding from the face. This of course is based on the assumption that the respective
MEG measurements are using this landmark as the one defining the head coordinate system.</div>
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<div class="">If the FOV of the MRI is even too narrow for that, there’s not much you could do. The only thing worth considering is a (suboptimal) linear registration of the small FOV image to a template MRI image (that contains a decent head contour) and warp
back the nasion position from the template into single subject space. But, as I said, this will be inaccurate.</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 15 May 2024, at 15:40, Pin-Chun Chen via fieldtrip <<a href="mailto:fieldtrip@science.ru.nl" class="">fieldtrip@science.ru.nl</a>> wrote:</div>
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<span style="color: rgb(33, 33, 33);" class="">Dear FieldTrip community,<o:p class=""></o:p></span></div>
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<span style="color: rgb(33, 33, 33);" class=""> <o:p class=""></o:p></span></div>
<div style="margin: 0cm; font-size: 12pt; font-family: Aptos, sans-serif;" class="">
<span style="color: rgb(33, 33, 33);" class="">I’m using the ft_volumerealign function for source localizing a MEG dataset.<o:p class=""></o:p></span></div>
<div style="margin: 0cm; font-size: 12pt; font-family: Aptos, sans-serif;" class="">
<span style="color: rgb(33, 33, 33);" class="">However, the T1 structure scan does not have a wide FOV that include the tip of the nose for some participants.<o:p class=""></o:p></span></div>
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<span style="color: rgb(33, 33, 33);" class=""> <o:p class=""></o:p></span></div>
<div style="margin: 0cm; font-size: 12pt; font-family: Aptos, sans-serif;" class="">
<span style="color: rgb(33, 33, 33);" class="">Does anyone have experience aligning the LPA/RPA/Nasion to MEG data with a narrow FOV?<o:p class=""></o:p></span></div>
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<span style="color: rgb(33, 33, 33);" class=""> <o:p class=""></o:p></span></div>
<div style="margin: 0cm; font-size: 12pt; font-family: Aptos, sans-serif;" class="">
<span style="color: rgb(33, 33, 33);" class="">Here are the scripts I’m using:<o:p class=""></o:p></span></div>
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<span style="color: rgb(33, 33, 33);" class=""> <o:p class=""></o:p></span></div>
<div style="margin: 0cm; font-size: 12pt; font-family: Aptos, sans-serif;" class="">
<span style="color: rgb(33, 33, 33);" class="">mri = ft_read_mri(mrifilename);<o:p class=""></o:p></span></div>
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<span style="color: rgb(33, 33, 33);" class=""> <o:p class=""></o:p></span></div>
<div style="margin: 0cm; font-size: 12pt; font-family: Aptos, sans-serif;" class="">
<span style="color: rgb(33, 33, 33);" class="">cfg = [];<o:p class=""></o:p></span></div>
<div style="margin: 0cm; font-size: 12pt; font-family: Aptos, sans-serif;" class="">
<span style="color: rgb(33, 33, 33);" class="">cfg.method = 'interactive';<o:p class=""></o:p></span></div>
<div style="margin: 0cm; font-size: 12pt; font-family: Aptos, sans-serif;" class="">
<span style="color: rgb(33, 33, 33);" class="">cfg.coordsys = 'neuromag';<o:p class=""></o:p></span></div>
<div style="margin: 0cm; font-size: 12pt; font-family: Aptos, sans-serif;" class="">
<span style="color: rgb(33, 33, 33);" class="">rmri = ft_volumerealign(cfg,mri);<o:p class=""></o:p></span></div>
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<span style="color: rgb(33, 33, 33);" class=""> <o:p class=""></o:p></span></div>
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<span style="color: rgb(33, 33, 33);" class="">Thank you,<o:p class=""></o:p></span></div>
<div style="margin: 0cm; font-size: 12pt; font-family: Aptos, sans-serif;" class="">
<span style="color: rgb(33, 33, 33);" class="">PinChun<o:p class=""></o:p></span></div>
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<span style="font-size: 11pt;" class=""><o:p class=""> </o:p></span></div>
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<span style="font-size: 11pt;" class=""><o:p class=""> </o:p></span></div>
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<span lang="EN-US" style="font-size: 11pt; font-family: Calibri, sans-serif;" class="">-- <o:p class=""></o:p></span></div>
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<span lang="EN-US" style="font-size: 11pt; font-family: Calibri, sans-serif;" class=""><o:p class=""> </o:p></span></div>
<div style="margin: 0cm; font-size: 12pt; font-family: Aptos, sans-serif;" class="">
<span lang="EN-US" style="font-size: 11pt; font-family: Calibri, sans-serif;" class="">Pin-Chun Chen, PhD<o:p class=""></o:p></span></div>
<div style="margin: 0cm; font-size: 12pt; font-family: Aptos, sans-serif;" class="">
<span lang="EN-US" style="font-size: 11pt; font-family: Calibri, sans-serif;" class="">Marie Curie Postdoctoral Fellow<o:p class=""></o:p></span></div>
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<span lang="EN-US" style="font-size: 11pt; font-family: Calibri, sans-serif;" class="">Department of Experimental Psychology<o:p class=""></o:p></span></div>
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<span lang="EN-US" style="font-size: 11pt; font-family: Calibri, sans-serif;" class="">University of Oxford<o:p class=""></o:p></span></div>
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<span lang="EN-US" style="font-size: 11pt; font-family: Calibri, sans-serif;" class=""><o:p class=""> </o:p></span></div>
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<span lang="EN-US" style="font-size: 9pt; font-family: Calibri, sans-serif;" class="">This is a Taiwanese name. First name is ‘Pin-Chun’ altogether, surname is ‘Chen’. There is no middle name.<o:p class=""></o:p></span></div>
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<o:p class=""> </o:p></div>
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