[Mristudio-users] Gradient from bvec can't be used

[susumu mori]

Sorry for my slow reply.

Here are the old and new Siemens 12. You can try both. If you use a wrong
one, the color map doesn't make any sense. So you can find which is the
correct one for you.

Also, Siemens users have to click "rotate if applicable" check box beneath
the gradient table input section, if you are using oblique-angle imaging.
This automatically read the oblique angle information and rotates the
gradient table.

You may also check the new button next of the gradient table input section
that can extract gradient information from Mosaic file. So no need to
specify the table and rotate it. This works for VB15 operating system.

Old Siemens 12

0: 0, 0, 0

1: 1, 0, 0.5

2: 0, 0.5, 1

3: 0.5, 1, 0

4: 1, 0.5, 0

5: 0, 1, 0.5

6: 0.5, 0, 1

7: 1, 0, -0.5

8: 0, -0.5, 1

9: -0.5, 1, 0

10: 1, -0.5, 0

11: 0, 1, -0.5

12: -0.5, 0, 1

New Siemens 12
0: 0, 0, 0
1:  1.000000, 0.414250, -0.414250
2:  1.000000, -0.414250, -0.414250
3:  1.000000, -0.414250, 0.414250
4:  1.000000, 0.414250, 0.414250
5:  0.414250, 0.414250, 1.000000
6:  0.414250, 1.000000, 0.414250
7:  0.414250, 1.000000, -0.414250
8:  0.414250, 0.414250, -1.000000
9:  0.414250, -0.414250, -1.000000
10:  0.414250, -1.000000, -0.414250
11:  0.414250, -1.000000, 0.414250
12:  0.414250, -0.414250, 1.000000

On Tue, Jun 8, 2010 at 11:18 AM, Hua Zhang <hzhang84 at asu.edu> wrote:

> Dear Professor Susumu Mori,
>
> The scanner type is SIEMENS Novus 1.5T ,Series Description=ep2d.diff.DTI 12
> Software Version=syngo MR 2002M 4VA22B.  Will this information do some
> help?
>
> Best,
> Hua
>
> 2010/6/8 susumu mori <susumu at mri.jhu.edu>
>
> Hi Hua,
>>
>> We usually do not extract gradient info from any header information
>> because there are many issues related to the gradient table and it is
>> difficult for us to keep track of all different formats especially when the
>> raw MRI data went through other software programs. The only exception is
>> Siemens DICOM after VB15, which is supported by DtiStudio for automated
>> gradient table extraction.
>>
>> If you tell us the type of scanner you used and operating system, we may
>> be able to provide a table.
>>
>> Susumu
>>
>> On Tue, May 18, 2010 at 6:42 PM, Hua Zhang <hzhang84 at asu.edu> wrote:
>>
>>> Hi,
>>> I have a dti data set of a single subject. The gradient table obtained by
>>> dcm2nii  is strange and can't get any logical result. Is there some other
>>> tools to get the right gradients information. Here I attach the data. Please
>>> help.
>>>
>>> Thanks,
>>> Hua Zhang
>>>
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