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<TITLE>Re: [Mristudio-users] theory - registration</TITLE>
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<FONT FACE="Calibri, Verdana, Helvetica, Arial"><SPAN STYLE='font-size:11pt'>Hi Susumu,<BR>
<BR>
I was wondering if you have been able to follow-up on your points in the email to Darren (below).<BR>
<BR>
I read the response re: TheoryAir from Hangyi, but it did not indicate whether TheoryAir does a regid or affine transform to answer whether or not it would be able to do eddy current correction-?<BR>
<BR>
I am able to do the Pixel rejection using Darren’s method and obtain results with binary mask & no “Image rejection”; however, I get Image rejection after performing TheoryAir- is that expected? How do you determine the # of iterations to perform with TheoryAir?<BR>
<BR>
Lastly, if I want to do TheoryAir and Pixel rejection, would I do TheoryAir, save DWI + b0 images as REC file, re-load into DtiStudio, and then perform Pixel rejection/tensor calculation?<BR>
<BR>
Thanks for your help,<BR>
<BR>
Julie<BR>
<BR>
Julie E. McEntee, MA, CCRP<BR>
Senior Research Program Coordinator<BR>
Department of Psychiatry- Neuroimaging<BR>
Johns Hopkins University School of Medicine<BR>
600 N. Wolfe St./Phipps 300<BR>
Baltimore, MD 21287<BR>
Phone: 410-502-0468<BR>
Fax: 410-614-3676<BR>
<BR>
<BR>
On 5/18/10 10:48 AM, "susumu mori" <<a href="susumu@mri.jhu.edu">susumu@mri.jhu.edu</a>> wrote:<BR>
<BR>
</SPAN></FONT><BLOCKQUOTE><FONT FACE="Calibri, Verdana, Helvetica, Arial"><SPAN STYLE='font-size:11pt'>Darren,<BR>
<BR>
You are using the "Pixel rejection" correctly and we have to investigate why you are getting "Image rejection" results.<BR>
<BR>
<BR>
</SPAN></FONT><BLOCKQUOTE><FONT FACE="Calibri, Verdana, Helvetica, Arial"><SPAN STYLE='font-size:11pt'>1) Should I run other registration methods such as AIR or MI before<BR>
theory-registratin? Will theory-registration take care of eddy current<BR>
correction?<BR>
</SPAN></FONT></BLOCKQUOTE><FONT FACE="Calibri, Verdana, Helvetica, Arial"><SPAN STYLE='font-size:11pt'><BR>
>Theory registration should be used instead of AIR or MI. I have to confirm Hangyi if TheoryAIR does rigid or affine. I'll get back to you with this respect too.<BR>
<BR>
</SPAN></FONT><BLOCKQUOTE><FONT FACE="Calibri, Verdana, Helvetica, Arial"><SPAN STYLE='font-size:11pt'><BR>
2) What images are changed by theory registration? The original<BR>
images? It doesn't seem to produce new images such as with mutual<BR>
information or AIR.<BR>
</SPAN></FONT></BLOCKQUOTE><FONT FACE="Calibri, Verdana, Helvetica, Arial"><SPAN STYLE='font-size:11pt'><BR>
>Yes, when you use TheoryAIR, you don't get a copy. The original images are overwritten.<BR>
<BR>
</SPAN></FONT><BLOCKQUOTE><FONT FACE="Calibri, Verdana, Helvetica, Arial"><SPAN STYLE='font-size:11pt'><BR>
Thanks,<BR>
Darren<BR>
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