ADNI studies might report on that.
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From: SPM (Statistical Parametric Mapping) [[log in to unmask]] on behalf of Joe Simon [[log in to unmask]]
Sent: Thursday, September 20, 2012 5:51 AM
To: [log in to unmask]
Subject: Re: [SPM] multi-center study
Dear Cinly
Thanks for your reply. It would indeed be difficult to use the same phantom in each centre. But going through the literature on the subject of multi-center fMRI-studies, it seems that using a phantom in order to allow a better comparison between the data collected at different sites is seldomly reported. Are there any landmark-studies or reports about a general consensus regarding the setup of multicenter fMRI-studies?
Thanks!
Karl
On Mon, Sep 17, 2012 at 7:38 PM, Cinly Ooi <[log in to unmask]<mailto:[log in to unmask]>> wrote:
Dear Karl,
That would be the best practice unless the hassle to organized them is too great, e.g., you have to travel around the globe.
Reason is the aim of the phantom scanning exercise is to make scans on all scanners performed in a (statistically) comparable way. To do so you go to each scanner and try to replicate the same scan as best as you can in order to make sure any variation in the results can be attributed to the scanner and scanner only. As such, you want to remove all possible source of contamination and this include the difference in phantoms used.
You only need to do it once. Another possible consideration is to scan both the phantom you bring to all scanners (the gold standard) and the scanner's own phantom on the same session. This way you might be able to 'calibrating' the scanner phantom against the 'gold standard'.
HTH
Cinly
On 17 September 2012 15:27, durdan tyler <[log in to unmask]<mailto:[log in to unmask]>> wrote:
Dear SPM-experts
I have a quick question considering multi-center studies; is it necessary for all centers to use the same MRI-phantom in order to assess data quality?
Best,
Karl
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Best Regards,
Cinly
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