<p>Dear Dorian,</p>
<p>I am sorry, but I thinj just the same. Pre and post surgical images would be different. When assesing this kind of subjects, you expect to find differences and the behavioral and functional consequences. It would not have sense using thd same B0 image because it would be insensitive to these changes that are the interesting question to speak about.</p>
<p>Best regards,<br>
Rosalía </p>
<div class="gmail_quote">El 23/01/2013 17:15, "Dorian P." <<a href="mailto:alb.net@gmail.com">alb.net@gmail.com</a>> escribió:<br type="attribution"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
Dear all,<div><br></div><div>I have a particular situation and would like your help. The DWI acquisitions from a very important subject have been recorded with errors from the scanner. I have most of the gradient directions, but not the B0. This would prevent me from calculating DTI, of course.</div>
<div><br></div><div>But I have a later DWI acquisition from the same subject, post surgery. So I was wondering if I can recover the pre-surgical DTI by using the B0 from the post-surgery scan.</div><div><br></div><div>So, do you think I can play around the problem and use the B0 from the second acquisition to calculate DTI on the first? Or, to put the question differently, are the changes in white matter reflected both on DWI and on the non-DWI images, or does the B0 stay the same insensitive measure to white matter changes, which are captured with DWI images.</div>
<div><br></div><div>Finally, would it make sense to make this swap and calculate FA with the same B0 both pre and post or this is simply a delirious solution?</div><div><br></div><div><br></div><div>Thank you.</div><div>
<br>
</div><div>Dorian</div>
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