<div>Graeme -</div>
<div> </div>
<div>yes - we are using a GE system and are also flipping the z direction,</div>
<div> </div>
<div>Barbara<br><br>-- <br>Barbara Weiland, PhD<br>Post Doc Fellow/MEG Physicist<br>Neuromagnetism Laboratory<br>Neurology Research<br>Henry Ford Health System<br>2799 W. Grand Blvd., CFP 79<br>Detroit, MI 48202-2689<br>
313-916-1075<br><a href="mailto:bjweiland@gmail.com">bjweiland@gmail.com</a></div>
<div> </div>
<div> </div>
<div> </div>
<div><span class="gmail_quote">On 6/17/08, <b class="gmail_sendername">Graeme Schwindt</b> <<a href="mailto:graeme.schwindt@gmail.com">graeme.schwindt@gmail.com</a>> wrote:</span>
<blockquote class="gmail_quote" style="PADDING-LEFT: 1ex; MARGIN: 0px 0px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid">Hello,<br><br>From the informative workshop here in Toronto, I have notes that indicate when performing fiber tracking, Siemens and GE data should have the eigen vector flipped in the X direction, and Philips in the Z direction. I have some GE dicom data, and have followed the protocol as in the workshop, loading in the AIRed FA map and eigenvector0 .vec file for fiber tracking. <br>
<br>When I chose flip in the X direction, the results of tracking appeared wrong, with corpus callosum fibers projecting in clearly the wrong direction and projecting for very short distances. I then tried flipping in the other two directions, and found extremely good results when flipping in the Z direction, which I was happy with. But I want to make sure that these results are not spurious, though the fibers follow anatomical pathways properly and so seem to be real. I wondered if there may be some orientation label problem? Is it also correct to load in the eigenvector 0 as the principal vector? Has anyone else had experience with GE dicom data and used Z flipping?<br>
<br>Thanks,<br>Graeme<br clear="all"><span class="sg"><br>-- <br>Graeme C. Schwindt, HBSc<br>MD/PhD Student<br>University of Toronto<br><a onclick="return top.js.OpenExtLink(window,event,this)" href="mailto:graeme.schwindt@gmail.com" target="_blank">graeme.schwindt@gmail.com</a><br>
416.546.5453 </span><br>_______________________________________________<br>Mristudio-users mailing list<br><a onclick="return top.js.OpenExtLink(window,event,this)" href="mailto:Mristudio-users@mristudio.org">Mristudio-users@mristudio.org</a><br>
<a onclick="return top.js.OpenExtLink(window,event,this)" href="http://lists.mristudio.org/mailman/listinfo/mristudio-users" target="_blank">http://lists.mristudio.org/mailman/listinfo/mristudio-users</a><br><br></blockquote>
</div><br><br clear="all"><br><br>