[Mristudio-users] gradient for GE Signa HDx

[Kevin Spitler]

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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