[Mristudio-users] gradient for GE Signa HDx

Mon Apr 25 01:57:51 EDT 2011

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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