[Mristudio-users] FW: DTI Gradient Orientation table (matrix)

[Carl Helmick]

The gradient orientation table is an ASCII text file and is located on  
the scanner.  It is called "tensor.dat" and is located in /usr/g/bin.   
The file is made up such that there is a line with a single number  
indicating number of directions, then a line for each gradient  
combination to get that number of directions.  For example, for 6, 7,  
and 8 directions you will see:

6
0.707 0.0 0.707
-0.707 0.0 0.707
0.0 0.707 0.707
0.0 0.707 -0.707
0.707 0.707 0.0
-0.707 0.707 0.0
7
1.0 0.0 0.0
0.333 0.943 0.0
-0.333 0.472 0.817
0.577 -0.817 0.0
0.333 -0.472 0.817
-0.577 -0.407 0.707
0.577 0.407 0.707
8
1.0 0.0 0.0
0.333 0.943 0.0
-0.333 0.472 0.817
0.577 -0.817 0.0
0.333 -0.472 0.817
-0.577 -0.407 0.707
0.577 0.407 0.707
0.0 1.0 0.0
This corresponds to gradient amplitudes in X, Y, and Z directions.

Here is the one from a GE Signa 1.5T (v.12):
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Cheers,
--------------------------------------------
Carl Helmick, B.C.S.
Manager, System Administrator, &
Computer Programmer
Brain Imaging Laboratory
Department of Psychiatry
Dalhousie University
--------------------------------------------


On 14-Aug-08, at 7:26 AM, mristudio-users-request at mristudio.org wrote:

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>   1. Re: FW: DTI Gradiant Orientation table (matrix) (John Sherman)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Thu, 14 Aug 2008 00:16:36 -0600
> From: John Sherman <johnlsherman at hotmail.com>
> Subject: Re: [Mristudio-users] FW: DTI Gradiant Orientation table
> 	(matrix)
> To: "DTI Studio, ROI Editor,	Landmarker Questions/Support"
> 	<mristudio-users at mristudio.org>
> Message-ID: <BAY138-W443EDF2B5E0991A90F448DCE720 at phx.gbl>
> Content-Type: text/plain; charset="windows-1252"
>
> Ask you service rep for a file named "tensor.dat". They can provide  
> this to  you.
> I am attaching a file that I got from G.E. for our 3.0 T. It will be  
> different for your scanner but it will give you an idea of what you  
> are looking for.
> I had to switch my x and y values and reformat the table to fit the  
> DTI Studio format but then it worked.
>
> Good Luck.
>
> John Sherman, M.D.
> Neuroradiology
> Pueblo Imaging Center
>
>
>
>
>
>
> Date: Wed, 13 Aug 2008 14:53:06 -0500From: hkim at peds.uab.eduTo: mristudio-users at mristudio.orgSubject 
> : [Mristudio-users] FW: DTI Gradiant Orientation table (matrix)
>
>
>
>
> Dear Sir;
>
> I would like to have DTI Gradiant Orientation table.
> Our MRI model is GE HDMR 1.5 SignaXciteHD.
> 25 directions DTI.
> GE persons could not provide it?
>
> I am also forwarding  our current DTI portocol.
> Thank you for your earliest attention.
>
> Sincerely,
>
>
> Hyunmi Kim, MD, PhD
> Assistant Professor
> Division of Pediatric Neurology
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