Thank you for letting us know this.<div>If you just subtract the two FA maps (or RA maps) by using RoiEditor (without tracking), do you get significant difference? The algorithms of automated rejection are not same between the two versions. If your data has some motion problems and many slices were rejected, it is possible that two different algorithms rejected the different number of slices. You can check which slices were rejected.</div>
<div><br></div><div>I would recommend you to use the regular tensor calculation without slice rejection and make sure the results are the same. If so, the difference should come from the rejection scheme.<br><br><div class="gmail_quote">
On Fri, Sep 17, 2010 at 6:30 PM, Rajagopalan, Venkateswaran <span dir="ltr"><<a href="mailto:rajagov2@ccf.org">rajagov2@ccf.org</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
<div>
<div><font face="Arial" color="#000000" size="2">Dear All,</font></div>
<div><font face="Arial" size="2"></font> </div>
<div><font face="Arial" size="2">I am surpirsed to find that DTI metrics (for instance RA metric) between DTIstudio_3.0_ beta version and DTIstudio_latest which i downloaded recently were very much different.</font></div>
<div><font face="Arial" size="2"></font> </div>
<div><font face="Arial" size="2">Same options were used like automatic outlier rejection of images >3% also the same CST ROI was superimposed in both the DTI studio beta version and in DTIstudio latest</font></div>
<div><font face="Arial" size="2"></font> </div>
<div><font face="Arial" size="2"></font> </div>
<div><font face="Arial" size="2">RA values along CST using DTIstudio_3.0_ beta version </font></div>
<div><font face="Arial" size="2"></font> </div>
<div><font face="Arial" size="2"> Slice #_Of_Fibers Max_Val Min_Val Mean_Val Std_Dev </font></div>
<div> 9: 1 0.50 0.50 0.50 0.00 1 1 1 1.00 0.00 <br> 10: 61 0.79 0.43 0.69 0.10 10 23 1 7.60 7.41 <br>
11: 60 0.85 0.18 0.74 0.14 13 25 1 10.62 8.91 <br> 12: 61 0.89 0.34 0.76 0.13 12 30 1 11.42 9.25 <br>
13: 61 0.95 0.27 0.75 0.15 11 28 1 12.64 9.83 <br> 14: 61 0.74 0.39 0.59 0.10 9 39 1 15.22 12.58 <br>
15: 61 0.74 0.32 0.57 0.10 10 45 1 14.40 14.19 <br> 16: 60 0.72 0.32 0.56 0.08 9 35 1 11.00 11.85 <br>
17: 61 0.68 0.47 0.61 0.06 8 37 2 16.13 12.19 <br> 18: 60 0.64 0.57 0.63 0.02 9 39 1 12.22 12.44 <br>
19: 61 0.61 0.52 0.59 0.02 9 37 1 15.11 10.87 <br> 20: 60 0.45 0.34 0.41 0.03 12 36 1 13.50 11.56 <br>
21: 61 0.37 0.20 0.30 0.04 16 42 1 12.94 13.91 <br> 22: 60 0.35 0.19 0.28 0.03 </div>
<div> </div>
<div><font face="Arial" size="2">RA values along CST using DTIstudio_latest</font></div>
<div><font face="Arial" size="2"></font> </div>
<div> Slice #_Of_Fibers Max_Val Min_Val Mean_Val Std_Dev </div>
<div><font face="Arial" size="2"></font> </div>
<div> 9: 1 0.97 0.97 0.97 0.00 1 1 1 1.00 0.00 <br> 10: 61 1.04 0.47 0.90 0.19 10 23 1 7.60 7.41 <br>
11: 60 1.16 0.11 0.93 0.19 13 25 1 10.62 8.91 <br> 12: 61 1.05 0.42 0.89 0.14 12 30 1 11.42 9.25 <br>
13: 61 1.13 0.25 0.87 0.14 11 28 1 12.64 9.83 <br> 14: 61 0.89 0.48 0.70 0.10 9 39 1 15.22 12.58 <br>
15: 61 0.87 0.27 0.65 0.13 10 45 1 14.40 14.19 <br> 16: 60 0.79 0.27 0.62 0.10 9 35 1 11.00 11.85 <br>
17: 61 0.80 0.47 0.68 0.10 8 37 2 16.13 12.19 <br> 18: 60 0.75 0.58 0.64 0.05 9 39 1 12.22 12.44 <br>
19: 61 0.70 0.53 0.65 0.04 9 37 1 15.11 10.87 <br> 20: 60 0.52 0.36 0.46 0.05 12 36 1 13.50 11.56 <br>
21: 61 0.43 0.21 0.32 0.04 16 42 1 12.94 13.91 <br> 22: 60 0.40 0.19 0.28 0.04 </div>
<div> </div>
<div>What am i doing wrong here. Same DTI data was used in both the versions and the processing steps were identical.</div>
<div> </div>
<div>Thanks</div>
<div> </div>
<div>Venkat</div>
<div> </div>
<div> </div>
<div> </div>
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