Here are important facts about Philips data;<br><br>1) You can control the number of b0 images (say 5 b0). However, no matter how many b0 you take, you get only 1 b0 image in the file (they are already averaged).<br>2) The final appended image is a calculated "isotropically diffusion-weighted image" (I believe). I'm not sure exactly how it is created. Maybe simply a sum of all DWIs. You don't use this image for tensor calculation. As you mentioned, in DtiStudio, you remove it by using [100, 100, 100].<br>
3) The order of b0, DWI, and the appended iso-DWI can be specified in the console. In the past, the default order was b0 - DWIs - iso, but in newer versions of operating system, you may get a file with DWIs-b0-iso order.<br>
<br>Hope it helps.<br><br>Susumu<br><br><div class="gmail_quote">On Wed, Sep 30, 2009 at 11:50 AM, [Seongjin] <span dir="ltr"><<a href="mailto:choisj70@gmail.com">choisj70@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
Dear Philips users among DTI studio users,<div><br></div><div>DTI data (from a scanner) consists of b=0 image, other DWIs corresponding to the number of gradients and one more extra image.</div><div>Anyone knows the details of the extra image from the scanner? In DTI studio, it's gradient table is 100, 100, 100. Typically it comes last in the data set.</div>
<div>It looks like a averaged image of all other DWIs. However, it looks different from the mean of all DWIs generated from DTI Studio.</div><div><br></div><div>Thanks in advance.</div><div><br></div><div>-SC</div><div><br>
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