[Mristudio-users] Gradient Table

[Scott Lytle]

The vendor (Siemens) should be able to provide the data for you. Every vendor is able to provide the gradient table, it's just a matter of getting in touch with the right person. Unfortunately for you, I don't work at Siemens, so I cannot help.
   
  Scott

ì¡°ì–‘ì œ <hifreaks at gmail.com> wrote:
    As I know, x,y,z information is not always necessary.
  I have succeeded to load Siemens (Trio, 20 dir) Mosaic files with gradient numbers
  You only have to not forget to write numbers of 100, 100, 100 and finally 0,0,0 at the end of table.
  Here is an example,
   
  0: -1.000000, 0.000000, 0.000000
1: 0.000000, -1.000000, 0.000000
2: 0.031984, -0.799591, 0.599693
  .
  .
  .
  18: -0.111012, -0.264029, -0.958105
19: -0.031984, -0.799591, -0.599693
20: 100, 100, 100
21: 0,0,0
 
  If you really want to find the x,y,z information, I'm afraid I can't answer it.
  But I have heard that the information is not technically necessary from the computer technologist
  working at the Siemens company. He have read the instructions and talked to me like that.
   
  Wish it would be helpful.
   
  Regards,
   
  YJ Cho
  
 
  2008/7/17, Tapan Jani <icee41 at gmail.com>:     Hello all,

I sent out an e-mail earlier about generating a gradient table and am still a little bit confused. In order to use DtiStudio properly, it seems that one needs a gradient table to go along with their data. Our lab is currently using a 3T Excite GE scanner to perform our DTI scans, but we also have a Siemens scanner for which the following questions apply. Within the dicom header of the GE scanner, under the tag #DTI Diffusion Dir (0019, 01E0), we are able to tell the number of gradients, but not able to find the x,y,z information. 

Is there a program that can generate gradient tables to go along with our dicom data, or can it actually be found within the header - and if so, where? Finally I was curious as to whether there are standard gradient tables that go along with specific scanners every time a DTI scan is performed.

Thank you very much for all of your help, it is much appreciated.

Sincerely,

Tapan Jani

tjani2 at uic.edu
 

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-- 
Yang-Je Cho

Dept of Neurology, Yonsei University 
College of Medicine, Seoul, Korea
Phone: 82-2-2228-1600, Cell: 016-298-7456, Fax: 82-2-393-0705 _______________________________________________
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