[Homer-users] 答复: Fwd: Fw:Difference between Homer and Homer2

[Xu Jingping]

Hi Meryem，

Thank you for your answer. After checking the code, I find there are
three reasons result in differnece:
1)Homer default DPF is [1 1], while DPF in Homer2 is [6.0 6.0].
2)If user don't  set UsePathLengthCorr value, the progaram will regard
the distance is 1.　While HOMER2 calculate the distance from SD data.
3)In my last data processing,Homer do filter on the rawdata, while
,homer2 do filter on the OD data.

Best wishes.
Jingping

-----邮件原件-----
发件人: homer-users-bounces at nmr.mgh.harvard.edu
[mailto:homer-users-bounces at nmr.mgh.harvard.edu] 代表 Meryem Ayse Yucel
发送时间: 2014年7月4日 1:28
收件人: homer-users at nmr.mgh.harvard.edu
主题: Re: [Homer-users] Fwd: Fw:Difference between Homer and Homer2

Hi Jingping,

HOMER2 plots in microMs while HOMER plots in Ms. So you need to have a
difference in the order of 10-6. Since your HOMER shows numbers in 10-5 I am
guessing this could be due to your SD file units (in cm or in mm).
HOMER takes them as cm, while HOMER2 asks you what unit you have and
converts accordingly. Please double check this. Besides these two, there is
still a little variance between the two time series, maybe you can check the
individual codes (filtering etc) to see what makes this difference.

Hope this helps.

Meryem



> Dear Users:
>     I have a question about the difference between Homer and Homer2 on
> preprocessing. When I do analysis on the same nirs data  using Homer
> and
> Homer2 respectively. However, I find the results(HbO,HbR,HbT ) are
> unequally, although the shape of the time-series is very similar.  The
> processing stream what I set  is: Intensity_to_OD,Bandpass_Filter
> (hpf=0.01,hpf=0.1),OD_to_Conc。The  attachment in this e-mail is
> three screenshots from Homer's result , Homer2's result, and Homer2's
> processing parameters.
>
> Doesn't anyone know why or what make the results different?
>
>
> --
>
> --
> Sincerely,
>
> Jingping.Xu
> State Key Laboratory of Cognitive
> Neuroscience and Learning,
> Beijing Normal University
> Add: No.19 Xinjiekouwai Street,
> Beijing, 100875, China, PR
> Tel: (+86)18101359781
> _______________________________________________
> Homer-users mailing list
> Homer-users at nmr.mgh.harvard.edu
> https://mail.nmr.mgh.harvard.edu/mailman/listinfo/homer-users

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