Same here!

Thanks,

Olaf


---
Olaf Hauk, PhD
MRC Cognition and Brain Sciences Unit
Phone: +44(0)1223 273702
Fax: +44(0)1223 359062


-----Original Message-----
From: Announcement for the Neuro MEG list [mailto:[log in to unmask]] On Behalf Of Burkhard Maess
Sent: 02 September 2010 14:17
To: [log in to unmask]
Subject: Re: SSS matrix from maxfilter

Hi Samu,

this certainly would be of interest. I am looking forward to testing this.
many thanks in advance,
Burkhard


Samu Taulu wrote:
> Hello,
>
> I discussed this question with my colleagues here at Elekta. 
> Unfortunately, it seems that the next planned official releases of 
> MaxFilter will not have the option of giving out the SSS matrix. 
> However, I could produce a Matlab tool that computes the SSS matrix 
> corresponding to your MaxFilter process. You could then use the matrix 
> for the lead field or multipole analysis, etc. Would this option be of 
> interest to you?
>
> Best regards,
> Samu
>
> Dr. Samu Taulu
> Research and Customer Relations
>
> Elekta Oy
> Street address: Siltasaarenkatu 18-20, Helsinki, Finland
> Mailing address: P.O. Box 34, 00531 Helsinki, Finland
> Tel: +358 9 756 240 83 (direct), +358 9 756 2400 (operator)
> Fax: +358 9 756 240 11
> E-mail: [log in to unmask]
>
>
>
>
> Tolga Özkurt wrote:
>> I definitely agree on the usefulness of availability of SSS matrix 
>> and also SSS coefficients to be open to users, as an option in 
>> Maxwell Filter. There are already works playing with SSS coefficients 
>> to get meaningful results from MEG data (like one of ours as an 
>> example: Özkurt*,* et al, "Spatial filtering of MEG signals for 
>> user-specified spherical regions")/ / / apart from the possible use 
>> of the SSS matrix to be inserted into inverse methods as Dr. Hauk 
>> mentions.///
>> //
>> I believe this would tremendously strengthen the use and improvement 
>> of SSS without the restrictions the current version has.
>>
>> Have a good one,
>>
>> Tolga
>>
>> -- 
>> Tolga Esat Özkurt, PhD
>>
>> Heinrich Heine University
>> Institute for Clinical Neuroscience and Medical Psychology - MEG Lab
>> email: [log in to unmask]
>>
>>
>> ------------------------------------------------------------------------
>> *From:* Olaf Hauk <[log in to unmask]>
>> *To:* [log in to unmask]
>> *Sent:* Thu, August 26, 2010 1:52:04 PM
>> *Subject:* SSS matrix from maxfilter
>>
>> Hello,
>>
>>  
>>
>> a while back, we had a discussion about the effect of (spatial) SSS 
>> in maxfilter on source estimation, i.e. whether the same operator 
>> should be applied to leadfields, for example. There was (sort of) a 
>> consensus that this is not necessary, because the sub-space of the 
>> leadfield affected by SSS is (most likely) below noise level, and 
>> will be suppressed using regularisation anyway.
>>
>> But it was mentioned that there will be an option to output the SSS 
>> matrix that is applied to the MEG data into a separate file. Is this 
>> option already available in maxfilter 2.1? If not, could it be 
>> implemented and released for example with the bug fixes that were 
>> announced for the near future?
>>
>>  
>>
>> Thanks,
>>
>>  
>>
>> Olaf et al.
>>
>>  
>>
>>  
>>
>>  
>>
>> ---
>>
>> Olaf Hauk, PhD
>>
>> MRC Cognition and Brain Sciences Unit
>>
>> 15 Chaucer Road
>>
>> Cambridge CB2 7EF
>>
>> Phone: +44(0)1223 273702
>>
>> Fax: +44(0)1223 359062
>>
>> E-Mail: [log in to unmask]
>>
>> http://www.mrc-cbu.cam.ac.uk
>>
>> http://www.mrc-cbu.cam.ac.uk/people/olaf.hauk/
>>
>>  
>>
>>

-- 
------------------------------------------------------------
Dr. Burkhard Maess
Max Planck Institute for Human Cognitive and Brain Sciences
Stephanstr. 1a, P.O. Box 500355, D-04303 Leipzig
Aussenstelle Bennewitz, phone/fax: +49(3425)887525-26/-11   
mail: maess 'at' cbs.mpg.de,           http://www.cbs.mpg.de
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