<div>Hi Venkat,</div>
<div> </div>
<div>We had the same question on our Siemens VA25A DTIs. The Siemen's tech support recommended a program called MRIConvert (<a href="http://lcni.uoregon.edu/~jolinda/MRIConvert/">http://lcni.uoregon.edu/~jolinda/MRIConvert/</a>) to extract the gradients. I don't have our tables in front of me, but the .8, 0, and .4 values seem pretty close to what I remember. Siemens said that they suspected the 1, 0, .5 values were in the scanner direction and the .8, 0, .4 values were in the patient direction, since I think Siemens automatically adjusts for that. Just be careful when using the MRIConvert program to extract gradients, since it flips the y sign for FSL purposes.</div>
<div> </div>
<div>Cheers,</div>
<div>Jeff<br><br></div>
<div class="gmail_quote">On Fri, Jul 9, 2010 at 9:33 AM, Rajagopalan, Venkateswaran <span dir="ltr"><<a href="mailto:rajagov2@ccf.org">rajagov2@ccf.org</a>></span> wrote:<br>
<blockquote style="BORDER-LEFT: #ccc 1px solid; MARGIN: 0px 0px 0px 0.8ex; PADDING-LEFT: 1ex" class="gmail_quote">
<div><br>
<p><font size="2">Dear All,<br><br>we collect our data from Siemens scanner. I got b-matrix from our MR techs for software version VA25A b matrix is as follows<br><br> 0: 0.000, 0.000, 0.000<br> 1: 1.000, 0.000, 0.500<br>
2: 0.000, 0.500, 1.000<br> 3: 0.500, 1.000, 0.000<br> 4: 1.000, 0.500, 0.000<br> 5: 0.000, 1.000, 0.500<br> 6: 0.500, 0.000, 1.000<br> 7: 1.000, 0.000, -0.500<br> 8: 0.000, -0.500, 1.000<br> 9: -0.500, 1.000, 0.000<br> 10: 1.000, -0.500, 0.000<br>
11: 0.000, 1.000, -0.500<br> 12: -0.500, 0.000, 1.000<br><br>I used dcm2nii software (to convert hem into nifti file for soem other purpose i also gives me bvec and bval files) which gives me the following matrix from the dicom header file<br>
<br>0 0 0<br>0.89 0 -0.45<br>0 0.45 -0.89<br>0.45 0.89 0<br>0.89 0.45 0<br>0 0.89 -0.45<br>0.45 0 -0.89<br>0.89 0 0.45<br>0 -0.45 -0.89<br>-0.45 0.89 0<br>
0.89 -0.45 0<br>0 0.89 0.45<br>-0.45 0 -0.89<br><br>Since not only the values are different but +/- signs are also different in DW directions. So I am wondering whether any one could tell me which is the correct table to go with.<br>
<br>Thanks<br><br>Venkat<br><br></font></p>
<p><pre>===================================
<p class="MsoNormal"><font color="green" size="5" face="Webdings"><span style="FONT-FAMILY: Webdings; COLOR: green; FONT-SIZE: 18pt">P</span></font><font color="navy" size="2" face="Calibri"><span style="FONT-FAMILY: Calibri; COLOR: navy; FONT-SIZE: 10pt"> </span></font><font color="green" size="1" face="Arial"><span style="FONT-FAMILY: Arial; COLOR: green; FONT-SIZE: 7pt">Please consider the environment before printing this e-mail</span></font></p>
Cleveland Clinic is ranked one of the top hospitals
in America by U.S.News & World Report (2009).
Visit us online at <a href="http://www.clevelandclinic.org/" target="_blank">http://www.clevelandclinic.org</a> for
a complete listing of our services, staff and
locations.
Confidentiality Note: This message is intended for use
only by the individual or entity to which it is addressed
and may contain information that is privileged,
confidential, and exempt from disclosure under applicable
law. If the reader of this message is not the intended
recipient or the employee or agent responsible for
delivering the message to the intended recipient, you are
hereby notified that any dissemination, distribution or
copying of this communication is strictly prohibited. If
you have received this communication in error, please
contact the sender immediately and destroy the material in
its entirety, whether electronic or hard copy. Thank you.
</pre>
<p></p></p></div><br>_______________________________________________<br>mristudio-users mailing list<br><a href="mailto:mristudio-users@mristudio.org">mristudio-users@mristudio.org</a><br><a href="http://lists.mristudio.org/mailman/listinfo/" target="_blank">http://lists.mristudio.org/mailman/listinfo/</a><br>
Unsubscribe, send a blank email to: <a href="mailto:mristudio-users-unsubscribe@mristudio.org">mristudio-users-unsubscribe@mristudio.org</a><br><br></blockquote></div><br>