Hi, Steve,
Right. I want to convert an FA image into a Z image on the basis of
similarity of voxel FA values to that mean and to use the stddev inside
the ROI. How to do that? BTW, what is different if using the stddev across
the image? Thanks.
haibo
>From: Steve Smith <[log in to unmask]>
>Reply-To: FSL - FMRIB's Software Library <[log in to unmask]>
>To: [log in to unmask]
>Subject: Re: [FSL] How to calculate CC on the FA map
>Date: Thu, 11 Jan 2007 17:26:04 +0000
>
>Hi,
>
>I think you're saying that you want to define an ROI within which to
> estimate a mean FA value. You then want to convert an FA image
>into a Z image on the basis of similarity of voxel FA values to
>that mean. However, in order to do that you will also need to
>define what standard deviation you want to use to form the Z. Do
>you want to use the stddev inside the ROI, or across the image, or
>maybe some other measure?
>
>Cheers.
>
>
>On 11 Jan 2007, at 11:56, xu haibo wrote:
>
>>Hi, Steve,
>>
>> Thanks for your time for answering my question. I try to get a Z
>> map where I can adjust the threshold to see the FA value of which
>> voxel is close that of ROI on the FA map. Sorry for my poor
>>english. Do I make myself clear? Thanks.
>>
>>
>>>From: Steve Smith <[log in to unmask]>
>>>Reply-To: FSL - FMRIB's Software Library <[log in to unmask]>
>>>To: [log in to unmask]
>>>Subject: Re: [FSL] How to calculate CC on the FA map
>>>Date: Wed, 10 Jan 2007 16:34:21 +0000
>>>
>>>Hi - I'm sorry, I can't understand what you're asking here.
>>>Please could you clarify what you are wanting to do?
>>>Thanks.
>>>
>>>
>>>On 7 Jan 2007, at 14:13, Haibo Xu wrote:
>>>
>>>>Hi, FSL experts,
>>>>
>>>> I want to calculate the correlation coefficient of the FA
>>>>value each
>>>>voxel referred to the FA value of ROI based on the FA map. If I
>>>>define the
>>>>ROI as the mass on the FA map, for example, then compare the FA
>>>>value each
>>>>voxel in the same brain volume to the FA value of ROI and try to
>>>> get a CC
>>>>map. In addition, to adjust the threshold to see which voxel is
>>>>highly
>>>>related to the ROI on the CC map. But I do not know to how to use
>>>> FSL
>>>>tools to get the CC map based on the FA map. Please tell me how
>>>>to do it.
>>>>Any suggestion or advice will be greatly appreciated.
>>>>
>>>>Haibo
>>>
>>>
>>>---------------------------------------------------------------------
>>>--- ---
>>>Stephen M. Smith, Professor of Biomedical Engineering
>>>Associate Director, Oxford University FMRIB Centre
>>>
>>>FMRIB, JR Hospital, Headington, Oxford OX3 9DU, UK
>>>+44 (0) 1865 222726 (fax 222717)
>>>[log in to unmask] http://www.fmrib.ox.ac.uk/~steve
>>>---------------------------------------------------------------------
>>>--- ---
>>
>>_________________________________________________________________
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>>http:// www.hotmail.com
>
>
>------------------------------------------------------------------------
>---
>Stephen M. Smith, Professor of Biomedical Engineering
>Associate Director, Oxford University FMRIB Centre
>
>FMRIB, JR Hospital, Headington, Oxford OX3 9DU, UK
>+44 (0) 1865 222726 (fax 222717)
>[log in to unmask] http://www.fmrib.ox.ac.uk/~steve
>------------------------------------------------------------------------
>---
_________________________________________________________________
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