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Subject:

Re: flipped images

From:

"MCLAREN, Donald" <[log in to unmask]>

Reply-To:

MCLAREN, Donald

Date:

Fri, 6 May 2011 11:54:04 -0400

Content-Type:

text/plain

Parts/Attachments:

Parts/Attachments

text/plain (97 lines)

I'd recommend the following article:
Good et al. Cerebral asymmetry and the effects of sex and handedness
on brain structure: a voxel-based morphometric analysis of 465 normal
adult human brains. 2001

Briefly,
You segment and normalize your brains, then you flip them the brains
and the segments, then you average all the brains and segments (so 2
times as many images). Now you will have a customized set of tissue
priors. Now, flip the original images. Next, take the flipped and
unflipped images and normalize them to the new template. Now you can
do the statistics.

Best Regards, Donald McLaren
=================
D.G. McLaren, Ph.D.
Postdoctoral Research Fellow, GRECC, Bedford VA
Research Fellow, Department of Neurology, Massachusetts General
Hospital and Harvard Medical School
Office: (773) 406-2464
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On Fri, May 6, 2011 at 6:39 AM, Emilia Lentini <[log in to unmask]> wrote:
>
> Thank you!
>
> I want to evaluate regional asymmetries in grey and white matter, by using
> flipped and non-flipped images in the same analysis e.g If Rhemisphere pre
> frontal gyrus are different from Lhemisphere pre frontal gyrus.
> How should I best set up the analysis?
> Should I adjust for different sized hemispheres?
> Do I need to normalize the flipped images in any other way than the
> non-flipped images?
> Best regards
> Emilia
> 2011/5/5 Michael Erb <[log in to unmask]>
>>
>> Am 05.05.2011 14:51, schrieb Emilia Lentini:
>>>
>>> Hi.
>>>
>>> I would like to do a full-factorial analysis with both flipped
>>> (right-left) and non-flipped images.
>>>
>>> To flip the images I use:
>>> Display --> resize {x}: -1 and then reorient images..
>>>
>>> When I try to run the analysis I get following error:
>>>
>>> "Error running job: Error using ==> spm_check_orientations"
>>>
>>>
>>> How can I correct for this error?
>>
>> You have to reslice the images e.g. with Coregister(Reslice).
>> Image Defining Space: a non-flipped image
>> Images to Reslice: your flipped images
>> afterwards you can delete your flipped images and use the resliced r*
>> images.
>>
>> Regards,
>> Michael.
>>>
>>> Can I flip the images in any other way?
>>>
>>>
>>> Best regards
>>> Emilia
>>
>> --
>> <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
>> Dr. Michael Erb
>> Sektion f. experimentelle Kernspinresonanz des ZNS
>> Abteilung Neuroradiologie, Universitaetsklinikum
>> Hoppe-Seyler_Str. 3,  D-72076 Tuebingen
>> Tel.: +49(0)7071/2987753    priv. +49(0)7071/61559
>> Fax.: +49(0)7071/294371
>> e-mail: <[log in to unmask]>
>> www: http://www.medizin.uni-tuebingen.de/nrad/sektion/
>> <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
>
>

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