[Mristudio-users] gradient for GE Signa HDx

[Kevin Spitler]

Thank you Drs Makki and Mori and all the forum very much.

I am able to do fiber tracking with a Z flip.

Best,
Kevin

On Sun, Apr 24, 2011 at 10:57 PM, Makki Malek <Malek.Makki at kispi.uzh.ch> wrote:
> Hi Susumo
> Hi Kevin
>
> The table is used wthout any flip. For fiber-tracking, I apply  z-flip (not
> x-sflip), and perfom this on well known tract.
>
> Regards
>
> ________________________________
> From: mristudio-users-bounces at mristudio.org on behalf of susumu mori
> Sent: Mon 4/25/2011 4:40 AM
> To: DTI Studio, ROI Editor, DiffeoMap Questions/Support
> Subject: Re: [Mristudio-users] gradient for GE Signa HDx
>
> Hi Kevin,
>
> sometimes, gradient table signs are already corrected. Have you tried
> Makki's table without X-flip?
>
> Susumu
>
> On Sun, Apr 24, 2011 at 4:43 PM, Kevin Spitler <kevinspitler at ucla.edu>
> wrote:
>> Thank you Dr. Makki.  The datasets load in DTIStudio now with a good
>> color map 0.
>>
>> I have a problem with tractography, when I attempt to do pathways
>> thattravel in the rostral-caudal plane.  For example, in attempts of
>> the
>> Inferior longitudinal fasciculus and the anterior thalamic radiation,
>> using the Wakana et al., 2007 methods, the resultant tractography only
>> travels in the Superior-Inferior plane, and these tracts have
>> signifcant rostro-caudal projection.  Would this hint at a specific
>> problem in the way I load of the data?  (images of the tractography
>> are too large to send to the group)
>>
>> I am using the gradient from Dr. Makki with format modification with
>> gradient line number and a colon:
>> 0: 0,0,0
>> 1: 1.000000 0.000000 0.000000
>> 2: 0.726000 0.688000 0.000000
>> 3: 0.167000 -0.199000 0.966000
>> 4: 0.732000 -0.619000 -0.284000
>> 5: -0.239000 -0.710000 0.662000
>> 6: -0.759000 -0.223000 0.612000
>> 7:  0.544000 0.480000 0.688000
>> 8:  0.079000 0.997000 -0.005000
>> 9:  0.773000 -0.183000 0.608000
>> 10: 0.485000 -0.782000 0.392000
>> 11: 0.081000 -0.788000 -0.611000
>> 12: 0.363000 -0.245000 -0.899000
>>
>> For Fiber Tracing, I click the "X-component" on the Flip Eigen Vector.
>>
>> I typically analyze data from a Siemens machine, so I am having
>> trouble with this data and appreciate your help.
>>
>> Best,
>> Kevin
>>
>> On Wed, Apr 20, 2011 at 5:46 AM, Makki Malek <Malek.Makki at kispi.uzh.ch>
>> wrote:
>>> -----BEGIN PGP SIGNED MESSAGE-----
>>> Hash: SHA256
>>>
>>>
>>> Hi Kevin
>>>
>>>  Below the 12D scheme on our HDxt. Unless you modified the sequence,
>>> your 2 b0 set of data are acquired first in  a GE system.
>>>
>>>
>>> 1.000000 0.000000 0.000000
>>> 0.726000 0.688000 0.000000
>>> 0.167000 -0.199000 0.966000
>>> 0.732000 -0.619000 -0.284000
>>> - -0.239000 -0.710000 0.662000
>>> - -0.759000 -0.223000 0.612000
>>> 0.544000 0.480000 0.688000
>>> 0.079000 0.997000 -0.005000
>>> 0.773000 -0.183000 0.608000
>>> 0.485000 -0.782000 0.392000
>>> 0.081000 -0.788000 -0.611000
>>> 0.363000 -0.245000 -0.899000
>>>
>>>
>>> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>>> Malek I. Makki, PhD
>>> Diagnostic Imaging Department
>>> MRI Center
>>> Kinderspital Zurich
>>>
>>> Phone. +41(0)44 266 3130
>>> Fax:      +41(0)44 266 7153
>>> malek.makki at kispi.uzh.ch
>>> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>>>
>>>
>>>
>>> - -----Original Message-----
>>> From: mristudio-users-bounces at mristudio.org
>>> [mailto:mristudio-users-bounces at mristudio.org] On Behalf Of Kevin
>>> Spitler
>>> Sent: Wednesday, April 20, 2011 1:31 PM
>>> To: Mristudio-users at mristudio.org
>>> Subject: [Mristudio-users] gradient for GE Signa HDx
>>>
>>> Hello,
>>>
>>> What gradient is used for DTIStudio for a GE Signa HDx?  The parameters
>>> are
>>> 12 directions
>>> 2 b values, including 1000
>>>
>>> Thank you for your help
>>>
>>> Best,
>>> Kevin
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>>>
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>>
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