Hi Steve,
How to use avwmaths++ to convert the FA to a Z image? The cmd line is
"avwmaths++ input-FA-image -sub mean -div std output-Z-image, isn't it
right? 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: Sun, 14 Jan 2007 18:41:25 +0000
>
>Hi - yes, use avwstats++ to get the std and mean within the ROI, and
> then avwmaths++ to convert the FA to a Z using this.
>Steve
>
>
>
>On 12 Jan 2007, at 11:44, xu haibo wrote:
>
>>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
>>>>>-------------------------------------------------------------------
>>>>>-- --- ---
>>>>
>>>>_________________________________________________________________
>>>>享用世界上最大的电?
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>>>
>>>
>>>---------------------------------------------------------------------
>>>--- ---
>>>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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>
>
>------------------------------------------------------------------------
>---
>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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