<br><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;"><div>Kimap, Kimap001, Kimap002 and Kimap003? </div></blockquote><div><br></div><div>If you use a 3-step cascading alpha method, you get the above 4 Kimaps. Kimap001 is the result with the most linear-like (less elastic) transformation. Kimap001+002 gives next step more elastic transformation. Kimap001+002+003 (=Kimap) provides the most elastic transformation. You can see how gradually transformation gets more and more elastic. When you apply Kimap001 + Kimap002, you can transform the original image twice, first by Kimap001 and then Kimap002; Kimap002(Kimap001(Image)). Or, you can combine Kimap001 and Kimap002 to create one transformation matrix (say "Kimap001+002") and then do transformation once; Kimap001+002 (Image). The latter prevents too many interpolation steps.</div>
<div> </div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;"><div>And How to choice</div>
<div>the á/ã ratio value in paper "Multi-contrast large deformation</div><div>diffeomorphic metric mapping for diffusion tensor imaging"?</div></blockquote><div><br></div><div>If your data is mostly young adults without much atrophy, one-shot LDDMM with alpha = 0.005 should give you a good result. If your subjects have a large amount of anatomical changes (e.g. severe atrophy like AD patients), then I would recommend 3-step cascading alpha with 0.01, 0.005, and 0.002, although, in many cases, the final step (Kimap003) usually doesn't deform the image much because most transformation is done by alpha=0.005 (Kimap001+002). </div>
<div><br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;"><div> </div><div> </div><div><em>Thank you everyone for your continued help and support!
</em></div><div><em></em> </div><div>Charng-Chyi Shieh</div><div>Radiological Technologist</div>
<br>_______________________________________________<br>
mristudio-users mailing list<br>
<a href="mailto:mristudio-users@mristudio.org">mristudio-users@mristudio.org</a><br>
<a href="http://lists.mristudio.org/mailman/listinfo/" target="_blank">http://lists.mristudio.org/mailman/listinfo/</a><br>
Unsubscribe, send a blank email to: <a href="mailto:mristudio-users-unsubscribe@mristudio.org">mristudio-users-unsubscribe@mristudio.org</a><br>
<br></blockquote></div><br>