[Homer-users] AtlasViewer - visualizing recorded NIRS data

[Vera Gramigna]

I need support on Homer regarding the stimuli and HRF.
Can I use this mail to ask a few questions???




--------------------------------------------
Lun 20/4/15, David Boas <dboas at nmr.mgh.harvard.edu> ha scritto:

 Oggetto: Re: [Homer-users] AtlasViewer - visualizing recorded NIRS data
 A: homer-users at nmr.mgh.harvard.edu
 Data: Lunedì 20 Aprile 2015, 14:45
 
 A tutorial
 on how to use AtlasViewer is about to be published in
 Neurophotonics and will be freely available.
 We
 will post the link to the paper here once it is
 available.
 David
 
 
 
 
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 On
 Apr 20, 2015, at 12:02 PM, Meryem Ayse Yucel <mayucel at nmr.mgh.harvard.edu>
 wrote:
 Hi Pankaj,
 
 Please see my responses
 interleaved.
 
 Meryem
 
 Hi Homer-users,
 I am trying to get used to
 AtlasViewer. I have followed all the tutorial
 videos on youtube and
 listed on tutorial page of Homer website.
 Is there a way to visualise the actual
 recorded NIRS data over the Atlas ?
 Some SPM or conditional comparison
 ?
 
 The current version of
 AtlasViewer does not have this option, however that
 is in our to do list.
 
 
 As of
 now, please correct me if I am wrong, AtlasViewer can
 visualise the
 optode,
 channel locations and compute and display sensitivity
 profiles for
 channel
 locations.
 
 That is correct. You can also evaluate
 probe fabrication error and
 inter-subject probe placement
 variability.
 
 
 Again, I find very little details as
 to what is sensitivity profile of a
 channel ?
 
 It is the sensitivity of the channel
 to absorption changes. Sensitivity
 matrix (A) transforms the absorption
 change in each voxel to a measurement
 change (eg optical density change). Or
 in other words, it will give us the
 information of how much absorption
 change has taken place if we observe
 this much optical density change at a
 specific source detector couple,
 because the optical density changes we
 observe is actually an integration
 of absorption changes over a volume
 (the tissue under the source and
 detector where the photon travel takes
 place). This A matrix can be
 obtained by performing Monte Carlo
 simulations of photon migration from or
 to each optode.
 
 
 
 I
 appreciate efforts of the developers in making Homer and
 AtlasViewer
 tools.
 Your response to my queries would really be appreciated.
 
 Kind regards
 Pankaj
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