Hi
I do not understand why you start talking about slices - the rest is
bbasically right.
cheers
c
On 30 Apr 2007, at 14:50, Xuelin Cui wrote:
> Christian:
>
> Thanks for your reply.
>
> According to your last Email, can I understand the spatial map and
> the time course for a single component as follows: Those spatial
> maps of a single IC is aquired at same time, but from different
> slices. The spatial map of an single IC is for all the time points
> during the scan. The corresponding time course is for controlling
> how the spatial map contribute to the fMRI signal at each time points.
>
> Am I right?
>
> Thanks a lot
>
> Xuelin
>
> ****************************************
> Xuelin Cui
> Department of Electrical Engineering
> University of Hawaii-Manoa
> Honolulu HI 96822
>
> Tel: 1-808-349-0983
> Email: [log in to unmask]
> ****************************************
>
> ----- Original Message -----
> From: Christian Beckmann <[log in to unmask]>
> Date: Monday, April 30, 2007 7:53 pm
> Subject: Re: [FSL] a question on IC map and time course
> To: [log in to unmask]
>
>> Hi,
>>
>> On 30 Apr 2007, at 08:54, Xuelin Cui wrote:
>>
>>> hi folks:
>>>
>>> I ran MELODIC for fMRI data, and thus have a bunch of
>> independent
>>> components which are displayed by a html file. In the html file,
>>
>>> there is a spatial map, a time course, as well as a Fourier
>>> spectrum of the time course.
>>>
>>> I have some questions on those in the html file:
>>>
>>> 1. Are all the spatial maps in single html file snapped at
>>> different time point? IF so what time are they?
>>>
>> No
>>
>>> 2. What is the relation between the time course and the spatial
>> map
>>> in the same html file?
>>>
>>
>> They express the spatial and temporal characteristics of a
>> component
>> - in a similar way that EVs (regressors in the GLM) and the
>> associated maps of parameter estimates express BOLD modulation.
>> That
>> is, the spatial maps corresponds to a map of parameter estimates
>> and
>> the time course describes how that spatial map is modulated in
>> strength at different time points.
>>
>>> 3. Are the 125 points time course variance corresponds to a
>> certain
>>> voxel in the brain? If so, which voxel is it? If not, what is it
>>
>>> related to? Some certain region?
>>>
>>
>> Likewise, the time course is related to the entire IC map - not to
>> a
>> single voxel.
>> cheers
>> christian
>>
>>> Thanks a lot
>>>
>>> Xuelin
>>>
>>> ****************************************
>>> Xuelin Cui
>>> Department of Electrical Engineering
>>> University of Hawaii-Manoa
>>> Honolulu HI 96822
>>>
>>> Tel: 1-808-349-0983
>>> Email: [log in to unmask]
>>> ****************************************
>>
>> ____
>> Christian F. Beckmann
>> University Research Lecturer
>> Oxford University Centre for Functional MRI of the Brain (FMRIB)
>> John Radcliffe Hospital, Headington, Oxford OX3 9DU, UK.
>> [log in to unmask] http://www.fmrib.ox.ac.uk/~beckmann
>> tel: +44 1865 222551 fax: +44 1865 222717
>>
____
Christian F. Beckmann
University Research Lecturer
Oxford University Centre for Functional MRI of the Brain (FMRIB)
John Radcliffe Hospital, Headington, Oxford OX3 9DU, UK.
[log in to unmask] http://www.fmrib.ox.ac.uk/~beckmann
tel: +44 1865 222551 fax: +44 1865 222717
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