<html><head><style type="text/css"><!-- DIV {margin:0px;} --></style></head><body><div style="font-family:times new roman, new york, times, serif;font-size:12pt"><div style="font-family: times new roman,new york,times,serif; font-size: 12pt;">Just wanted to correct myself from yesterday's reply....<br><br> I use the versorRigid3DTransformOptimizer not the gradient descent.<br><br>Thank you,<br>Emma<br><br><div style="font-family: times new roman,new york,times,serif; font-size: 12pt;">----- Original Message ----<br>From: Luis Ibanez <luis.ibanez@kitware.com><br>To: Emma Ryan <eryanvtk@yahoo.com><br>Cc: insight-users@itk.org<br>Sent: Thursday, July 26, 2007 5:51:33 PM<br>Subject: Re: [Insight-users] DeformableRegistration7.cxx gives worse results<br><br><div>Hi Emma,<br><br>It shouldn't happen...<br><br><br> A bit more of information will be helpful...<br><br><br>For
example:<br><br>1) Are the two synthetic images representing the same<br> Modality ?<br><br> The Image metric in DdeformableRegistration7.cxx<br> is MeanSquares, so it is expected that both images<br> should represent the same modality with a similar<br> distribution of intensity values.<br><br>2) What combination of registration components did<br> you used for the Rigid registration ?<br><br> - What Metric ?<br> - What Transform ?<br> - What Interpolator ?<br> - What Optimizer ?<br><br>3) Are you feeding DdeformableRegistration7 with the<br> resampled image resulting from a Rigid registration<br> process ? or did you set up the Bulk
transform of<br> the BSpline deformable transform ?<br><br>4) How many iterations of the Deformable registration<br> did you manage to run before it stopped. ?<br><br><br>BTW, the size limit of emails to the list is 40Kb,<br> If you want to show images you could upload<br> them to a public web site and send the link<br> to the list.<br><br><br><br>Please let us know about the questions above.<br><br><br> Thanks<br><br><br><br> Luis<br><br><br>------------------<br>Emma Ryan wrote:<br>> Hi,<br>> <br>> I am trying to register some synthetic data using <br>> deformableRegistration7.cxx from the ITK Examples. The synthetic data is <br>> almost well registered using rigid registration. So deformable <br>> registration is
used to fix the slight mismatch. Unfortunately, the <br>> checkerboard output for the 'after' images are worse that 'before'.<br>> <br>> Why does this happen ?<br>> <br>> Any clues ? I haven't changed anything in the code except the Pixeltype<br>> <br>> Emma<br>> <br>> p.s. I tried to attach some images but it bounced back.<br>> <br>> ------------------------------------------------------------------------<br>> Need a vacation? Get great deals to amazing places <br>> <<a target="_blank" href="http://us.rd.yahoo.com/evt=48256/*http://travel.yahoo.com/;_ylc=X3oDMTFhN2hucjlpBF9TAzk3NDA3NTg5BHBvcwM1BHNlYwNncm91cHMEc2xrA2VtYWlsLW5jbQ--%3Eon">http://us.rd.yahoo.com/evt=48256/*http://travel.yahoo.com/;_ylc=X3oDMTFhN2hucjlpBF9TAzk3NDA3NTg5BHBvcwM1BHNlYwNncm91cHMEc2xrA2VtYWlsLW5jbQ-->on</a> <br>> Yahoo! Travel.<br>> <br>> <br>>
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