Hi all:
We performed a thickness change study which related to the menstrual cycle. We scanned subjects during different menstrual phases in a counterbalance manner. Thus when we conduct a longitudinal analysis, we need to set time point according to the actual scanning order (i.e., 1st scan as Tp1 and so on) or according to the phase (i.e., menstruation phase as Tp1 and other phase as TpN)?
Thanks for your suggestion.
Hi, I'd recommend to use time for the order when processing. The order of time points is not relevant in the longitudinal stream but this way the design is more balanced.
Best Martin
On May 7, 2012, at 23:59, lordowen lordowentu@gmail.com wrote:
Hi all:
We performed a thickness change study which related to the menstrual cycle. We scanned subjects during different menstrual phases in a counterbalance manner. Thus when we conduct a longitudinal analysis, we need to set time point according to the actual scanning order (i.e., 1st scan as Tp1 and so on) or according to the phase (i.e., menstruation phase as Tp1 and other phase as TpN)?
Thanks for your suggestion.
-- Best regards -- 杜政昊
Cheng-Hao Tu, PhD Post Doctoral Research Fellow Integrated Brain Research Unit Department of Medical Research and Education Taipei Veterans General Hospital No.201, Sect.2, Shih-Pai Rd. Taipei Taiwan Email: lordowen@ms10.hinet.net or lordowentu@gmail.com Tel: +886-2-28712121 ext 3474 Fax: +886-2-28745182
Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer
In terms of just giving it a name, it should not matter since all of the time points are treated equally in the longitudinal stream. When you go to analyze it, the order will make a difference (and I assume you'll use phase). doug
On 05/07/2012 11:59 PM, lordowen wrote:
Hi all:
We performed a thickness change study which related to the menstrual cycle. We scanned subjects during different menstrual phases in a counterbalance manner. Thus when we conduct a longitudinal analysis, we need to set time point according to the actual scanning order (i.e., 1st scan as Tp1 and so on) or according to the phase (i.e., menstruation phase as Tp1 and other phase as TpN)?
Thanks for your suggestion.
freesurfer@nmr.mgh.harvard.edu
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Douglas N Greve -
lordowen -
Martin Reuter