[FieldTrip] Source Analysis

[Azeez Adebimpe]

Thank  you Eelke,I got the second part very well.I ensured that the sensor aligned very well on  the head model before calculating there source analysis. I don't have the MRI for the subjects but want to use any of the template MRI to view the result of source analysis. I made use of T1,mii in spm8 but couldn't get it as it was done in online tutorial. I don't have MRI for the patients but used head model from ASA software.I will be glad for more info.  

Azeez
 





> Date: Fri, 6 Dec 2013 16:07:24 +0100
> From: eelke.spaak at donders.ru.nl
> To: fieldtrip at science.ru.nl
> Subject: Re: [FieldTrip] Source Analysis
> 
> Hi Azeez,
> 
> For your question (1), I think it would be helpful if you give a bit
> more information on what you are doing. If the source reconstruction
> is not aligned to your MRI, probably some ingredient for the source
> analysis was also misaligned. Could you see whether your source model,
> volume conduction model, and sensor definition are all in alignment?
> (See here http://fieldtrip.fcdonders.nl/faq/how_can_i_check_whether_the_grid_that_i_have_is_aligned_to_the_segmented_volume_and_to_the_sensor_gradiometer
> )
> 
> Regarding (2): typically I would use cfg.taper = 'dpss' (the default)
> and then choose a combination of cfg.foi and cfg.tapsmofrq that yield
> the frequency band of interest. E.g. cfg.foi = 20 and cfg.tapsmofrq =
> 8 gives you a frequency band ranging from 12 to 28 Hz.
> 
> Best,
> Eelke
> 
> On 5 December 2013 20:32, Azeez Adebimpe <ayobimpe2004 at hotmail.com> wrote:
> >
> > hello,
> >
> > 1. I used ASA head model to projected electrode on it  to calculated the
> > lead field and perform source analysis. I ma having problem with the
> > projection of source on MRI after source interpolation.  The source couldn't
> > align with the  MRI image. The first picture is  for the source (before
> > interpolation) and the second is after interpolation. I have tried several
> > methods like volumeresclice but no good result. Please help me!
> >
> >
> > 2. I want to do source analysis in frequency band (like alpha, beta  etc)
> > with frequency analysed data (ouput of ft_frequencyanalysis). But in the
> > source analysis, I can only select one frequency (not band). Please I how
> > can I play with it to get the frequency range of interest?
> >
> > Best regards,
> > Azeez Adebimpe
> >
> >
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