Hi Bruce,
Thank you very much. I will try it. And I have another question. I also
want to study the
relation between age and the whole brain volume, gray matter volume and white
matter volume. The
whole brain volume is the same as eTIV, is right?
Thanks,
Zheng
At 2017-11-22 10:29:43, "Bruce Fischl" <fis...@nmr.mgh.harvard.edu> wrote:
>you would include it as a nuisance variable in the glm
>On Wed, 22 Nov 2017,
>郑凤莲 wrote:
>
>> Hi Bruce,
>>
>> Thanks for your quick reply. These results are not correted by eTIV, If eTIV are corrected,
I
>> can only get the p value and scatter plot, I can't get the line trend. Do
you know how to get the
>> line trend with eTIV corrected as these results?
>>
>> Thanks,
>> Zheng
>>
>>
>>
>>
>>
>> 在 2017-11-22 10:14:16，"Bruce Fischl" <fis...@nmr.mgh.harvard.edu> 写道：
>> >is this eTIV corrected? I would look at some of the outliers and make
>> >sure that the segmentations are accurate. Certainly the trend is in the
>> >correct (and depressing) direction.
>> >
>> >cheers
>> >Bruce
>> >On Wed, 22 Nov 2017, 郑凤莲 wrote:
>> >
>> >> Hi Bruce,
>> >>
>> >> Thanks for your advice. There are a part of the result. Blue color stands women, and Red c
olo
>> r
>> >> stands men.
>> >> The number of the data is not enough large. Are they ok? May I use
them in my paper?
>> >> [IMAGE][IMAGE][IMAGE]
>> >>
>> >>
>> >> Thanks a lot !
>> >> Zheng
>> >>
>> >>
>> >>
>> >>
>> >> At 2017-11-20 10:15:49, "Bruce Fischl" <fis...@nmr.mgh.harvard.edu> wrote:
>> >> >Hi Zheng
>> >> >
>> >> >I would scatter plot age vs. volume, coloring men and women differently
>> >> >(or different symbols) with and without eTIV correction to get an idea of
>> >> >what is going on
>> >> >
>> >> >cheers
>> >> >Bruce
>> >> >
>> >> >
>> >> >On Mon, 20 Nov
>> >> >2017, 郑凤莲 wrote:
>> >> >
>> >> >> Hi Bruce,
>> >> >>
>> >> >> My data is loss from 35 to 40. But the uniform of sex is not well
from 40 to 55 and from
56
>> to
>> >> >> 71. I did the correlation analysis between age and volume. I don't
know how I can explain t
his
>> >> >> problem.
>> >> >> Thanks again.
>> >> >>
>> >> >> Sincerely,
>> >> >> Zheng
>> >> >>
>> >> >>
>> >> >>
>> >> >>
>> >> >>
>> >> >> At 2017-11-20 09:35:45, "Bruce Fischl" <fis...@nmr.mgh.harvard.edu> wrote:
>> >> >> >Hi Zheng
>> >> >> >
>> >> >> >how uniform is your distribution? I'm hardly an expert on this, but I
>> >> >> >wouldn't expect very large effects until you get into the older end of
>> >> >> >that range. Have you scatter plotted your data?
>> >> >> >Bruce
>> >> >> >On Mon, 20 Nov 2017, 郑凤莲
>> >> >> >wrote:
>> >> >> >
>> >> >> >>
>> >> >> >> Hi Bruce,
>> >> >> >>
>> >> >> >> Thank you for your help.
>> >> >> >> I have 54 subjects, aged from 21 to 71 and only one group. I
want to compare the ch
ang
>> e o
>> >> f
>> >> >> >> hippocampus volume with age. The results before and after doing the correction for eTIV
are
>> th
>> >> e
>> >> >> >> same. Where is wrong? Or if there is no error, how can I explain it
in discussion?
>> >> >> >>
>> >> >> >> Thanks,
>> >> >> >> Zheng
>> >> >> >>
>> >> >> >>
>> >> >> >>
>> >> >> >>
>> >> >> >>
>> >> >> >> At 2017-11-20 04:55:49, "Bruce Fischl" <fis...@nmr.mgh.harvard.edu> wrote:
>> >> >> >> >Hi Zheng
>> >> >> >> >
>> >> >> >> >yes, I see. Maybe the effect is smaller than you have the power to see, or
>> >> >> >> >there is no effect? You would need to give us more details for us to help.
>> >> >> >> >Are you correcting for eTIV? What measure are you comparing?
>> >> >> >> >
>> >> >> >> >cheers
>> >> >> >> >Bruce
>> >> >> >> > On Sun, 19 Nov 2017, 郑凤莲 wrote:
>> >> >> >> >
>> >> >> >> >> Hi Bruce,
>> >> >> >> >>
>> >> >> >> >> I am sorry for this situation.
>> >> >> >> >> In the first way, there was an statistical difference in
left hippocampus, but n
o d
>> iff
>> >> ere
>> >> >> nce
>> >> >> >> in
>> >> >> >> >> right hippocampus. In the second way, there was both no
statistical difference in lef
t o
>> r
>> >> >> >> >> right hippocampus. I don't know what causes this result.
>> >> >> >> >> Can you understand me this time?
>> >> >> >> >>
>> >> >> >> >> Thanks,
>> >> >> >> >> Zheng
>> >> >> >> >>
>> >> >> >> >>
>> >> >> >> >>
>> >> >> >> >>
>> >> >> >> >> At 2017-11-18 22:58:56, "Bruce Fischl" <fis...@nmr.mgh.harvard.edu> wrote:
>> >> >> >> >> >Hi Zheng
>> >> >> >> >> >
>> >> >> >> >> >no difference between what and what?
>> >> >> >> >> >
>> >> >> >> >> >cheers
>> >> >> >> >> >Bruce
>> >> >> >> >> >On Fri, 17 Nov 2017, 郑凤莲 wrote:
>> >> >> >> >> >
>> >> >> >> >> >> Hi professor,
>> >> >> >> >> >>
>> >> >> >> >> >> I am using Freesurfer for DTI data. When I run 'mri_segstats', I
>> >> >> >> >> >> got the result that there w
>> >> >> >> >> as
>> >> >> >> >> >> an obvious difference in left hippocampus, but no difference
in right hippocampus.
Th
>> en,
>> >> I
>> >> >> run
>> >> >> >> >> >> segmentation of hippocampus subfields. The result showed
there is no difference in
to
>> tal
>> >> le
>> >> >> ft
>> >> >> >> or
>> >> >> >> >> >> right hippocampus, and only in two right hippocampus
subfields has significant dif
fer
>> enc
>> >> e.
>> >> >> Why
>> >> >> >> is
>> >> >> >> >> >> there inconsistent result in two means?
>> >> >> >> >> >> Thank you very much.
>> >> >> >> >> >>
>> >> >> >> >> >> Sincerely,
>> >> >> >> >> >> Zheng
>> >> >> >> >> >>
>> >> >> >> >> >>
>> >> >> >> >> >>
>> >> >> >> >> >>
>> >> >> >> >> >>
>> >> >> >> >> >>
>> >> >> >> >> >>
>> >> >> >> >>
>> >> >> >> >>
>> >> >> >> >>
>> >> >> >> >>
>> >> >> >> >>
>> >> >> >> >>
>> >> >> >> >>
>> >> >> >>
>> >> >> >>
>> >> >> >>
>> >> >> >>
>> >> >> >>
>> >> >> >>
>> >> >> >>
>> >> >>
>> >> >>
>> >> >>
>> >> >>
>> >> >>
>> >> >>
>> >> >>
>> >>
>> >>
>> >>
>> >>
>> >>
>> >>
>> >>
>>
>>
>>
>>
>>
>>
>>
