[Mristudio-users] Eddy_current_correction

[Zhang, Aifeng]

Dear DTIStudio,

Is coregistration always recommended as the first step, as I saw from articles from your lab? In our case, we only acquired 1 DTI sequence with 32 directions (~4 mins, with SENSE 2.5).  thanks.

Sincerely,
Aifeng

From: mristudio-users-bounces at mristudio.org [mailto:mristudio-users-bounces at mristudio.org] On Behalf Of susumu mori
Sent: Wednesday, June 30, 2010 9:32 PM
To: DTI Studio, ROI Editor, DiffeoMap Questions/Support
Subject: Re: [Mristudio-users] Eddy_current_correction

When you load the REC file using "Mri3DView", make sure how many images are in the file. For example, if you used Philips "High" table, you have 1 b0 + 32 DWI + 1 extra image, total 34 images. The last one is an isotropically-weighted image generated from the DWIs. Then make sure your gradient table. Most likely, the number of images in your REC and the gradient table are not matching.

For example, you may have only 33 lines in the table. For the final image, which you don't use, you can add an extra line with 33: 100, 100, 100. The first "33" is the line number (34th table row), and "100, 100, 100" sends a message to DtiStudio "don't use this image".


On Tue, Jun 29, 2010 at 6:19 AM, Seyede Ghazal Mohades <Seyede.Ghazal.Mohades at vub.ac.be<mailto:Seyede.Ghazal.Mohades at vub.ac.be>> wrote:
>Dear all
I have a completely basic question
when I try to load Philips Rec images in DTI studio I can do it, however the same set file  (which is a DTI ss-EPI sequence )gives the following error when I try to do DTI mapping :
the file is Bigger (and sometimes it says smaller)than a DWI sequence!
where is the problem?
regards
Ghazal
>Thanks
>
>-----Original Message-----
>From: mristudio-users-bounces at mristudio.org<mailto:mristudio-users-bounces at mristudio.org> on behalf of support at mristudio.org<mailto:support at mristudio.org>
>Sent: Mon 6/28/2010 12:24 PM
>To: DTI Studio, ROI Editor, DiffeoMap Questions/Support
>Subject: Re: [Mristudio-users] Eddy_current_correction
>
>the 1st method would be fine: use the 1st B0 as a reference and register all
>others with it.
>
>support
>
>
>
>>
>> Hi All,
>>
>> We have diffusion data set acquired with 5 trails/repetitions(in single time
>> point/cross sectional) for each and every subject. This means i have 5 b0(same
>> value) and DW (12 directions) data while doing eddy current correction can i
>> choose for instance b0 from first trail and register all the DW and other b0
>> images to this or do eddy current correction separately for each and every trail
>> and finally register all of them together say for instance to the first trail.
>>
>> Thanks
>>
>> venkat
>>
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>P Please consider the environment before printing this e-mail
>
>Cleveland Clinic is ranked one of the top hospitals
>in America by U.S.News & World Report (2009).
>Visit us online at http://www.clevelandclinic.org for
>a complete listing of our services, staff and
>locations.
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>Confidentiality Note:  This message is intended for use
>only by the individual or entity to which it is addressed
>and may contain information that is privileged,
>confidential, and exempt from disclosure under applicable
>law.  If the reader of this message is not the intended
>recipient or the employee or agent responsible for
>delivering the message to the intended recipient, you are
>hereby notified that any dissemination, distribution or
>copying of this communication is strictly prohibited.  If
>you have received this communication in error,  please
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