The order is correct except for the step #3, which is not necessary.<br>I wonder how you did to average the scan because DtiStudio doesn't offer a function to average scans, I thought.<br><br>For the tensor fitting with multiple-repetition data, you don't need average the data before the tensor calculation. This is very similar to a simple XY plot linear fitting. Suppose you have 8 measurement points to perform Y=aX+b fitting. If the 8 points are spread along the X axis (say, at X = 1, 3, 5, 7, 9, 11, 13,15), you just perform the fitting. What if the 8 points are at X = 1, 5, 9, 13? This means, at each X value, there are two measurement points. Do you calculate an average value for each X value before the fitting? I think in most case you do the same 8-point fitting in this case too.<br>
<br>Likewise, if you have, for example 3 sets of 30-orientation measurements, you don't have to reduce the data to a single 30-orientation before tensor calculation. You can just submit 90-point linear fitting.<br><br>
Hope this is clear.<br><br>Also for the step #2, Yes, AIR is for co-registration and if you choose Affine, it also does Eddy current correction.<br><br><div class="gmail_quote">On Tue, Jan 19, 2010 at 2:36 AM, Ryan <span dir="ltr"><<a href="mailto:wmcgarry@gmu.edu">wmcgarry@gmu.edu</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;">Hello everyone,<div> I want to confirm that I have the correct order for DTI analysis performed with a Siemens scanner using the Mosaic option, where several sets are collected. After going through the mailing list, I'm still not certain if this order is correct:</div>
<div> 1) Load the multiple sets of images</div><div> 2) Perform auto registration (is this the same as co-registration? if not, how do I do co-registration?)</div><div> 3) Average the AIRed scans</div><div> 4) Perform tensor calculations</div>
<div> </div><div><br></div><div>Thank you very much!</div>
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