[Mristudio-users] Siemens Allegra gradient table

[luca.binotto at unipd.it]

Hello Dr. Susumu,

as I said, I need a gradient table with 30 directions for Siemens Allegra
3 tesla.
I tried to enter in DtiStudio the previous table you kindly sent to me
(GRADIENT TABLE SIEMENS  a list of VB13 gradient table), in the
following format, ( dti data is composed of 3 b=0 volumes and 30 diffusion
volumes):


                0:   0,    0,    0
                1:   0,    0,    0
                2:   0,    0,    0
                3:   -0.208098,  0.525514,  0.850005
                4:    0.202387,  0.526131,  0.851002
                5:    0.409956,  0.175267,  0.918257
                6:   -0.412630,  0.742620,  0.565889
                7:   -0.207127,  0.959492,  0.280092
                8:   -0.872713,  0.525505,  0.064764
                9:   -0.746815,  0.526129,  0.455449
               10:   -0.415238,  0.175473,  0.915841
               11:   -0.746636,  0.175268,  0.673642
               12:   -0.665701,  0.742619, -0.217574
               13:   -0.330391,  0.959489, -0.110458
               14:   -0.331275,  0.525513, -0.809983
               15:   -0.663936,  0.526130, -0.569521
               16:   -0.999332,  0.175474, -0.111904
               17:   -0.871398,  0.175267, -0.501922
               18:    0.001214,  0.742616, -0.700356
               19:    0.002949,  0.959483, -0.348370
               20:    0.667975,  0.525509, -0.565356
               21:    0.336490,  0.526126, -0.807431
               22:    0.202383, -0.175470,  0.985002
               23:    0.208094,  0.175265, -0.983848
               24:    0.666452,  0.742619, -0.215262
               25:    0.332212,  0.959489, -0.104850
               26:    0.205064,  0.958364,  0.285421
               27:    0.412630,  0.742620,  0.565889
               28:    0.746093,  0.175315,  0.674232
               29:    0.744110,  0.525505,  0.460568
               30:    0.871894,  0.526125,  0.070507
               31:    0.874264,  0.175471, -0.496841
               32:    1.000000,  0.175267, -0.106112


but I got very bad results, meaning that I used the wrong table.
In 2000, Siemens launched Allegra 3T MR scanner, while TRIO
was launched an year later. In mristudio mailing list it was posted
a 12 directions gradient table for TRIO scanner. I would try to use
a TRIO  30 directions table if  you could find it.
The only info I found in the dicom dti scan header was :
Syngo MR 2004A 4VA25A  software version.

Many thanks again,
Luca



















> I hope this will do.
> If not, please let me know.
> You have to change the format to the MriStudio format.
>
> On Tue, Nov 9, 2010 at 3:09 PM, <luca.binotto at unipd.it> wrote:
>
>> Dear All,
>>
>> I am looking for gradient table for Siemens Allegra 3 tesla  MR System
>> with 30 directions.
>> Can I use the one posted in this mailinglist for Siemens Avanto?
>>
>> Many thanks in advance,
>>
>> Luca Binotto
>>
>>
>>
>>
>>
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