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<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Hello everyone!<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>I just start using ITK, this library is too big for me to
get all the information by myself. <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>I am trying to perform image registration between a 3D
volume and a 2D image. The most common way of doing this I found is to use itkRayCastInterpolateImageFunction
to project the 3D volume into 2D image. I made a few modifications to the code InsightApplications/IntensityBased2D3DRegistration,
but I still have some doubts. The main components of my code now are: <o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=1 face="Courier New"><span
style='font-size:9.0pt;font-family:"Courier New"'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=1 face="Courier New"><span
style='font-size:9.0pt;font-family:"Courier New"'>Transform type: itkBSplineDeformableTransform
<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=1 face="Courier New"><span
style='font-size:9.0pt;font-family:"Courier New"'>Metric type: itkMeanSquaresImageToImageMetric<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=1 face="Courier New"><span
style='font-size:9.0pt;font-family:"Courier New"'>Interpolator type: itkRayCastInterpolateImageFunction<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=1 face="Courier New"><span
style='font-size:9.0pt;font-family:"Courier New"'>Optimizer type: itkOnePlusOneEvolutionaryOptimizer<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=1 face="Courier New"><span style='font-size:9.0pt;
font-family:"Courier New"'>Registration type: itkImageRegistrationMethod (</span></font><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>treat the 2D
image as a 3D data with Z dimension to be 1)<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>I don’t have a clear idea of how </span></font><font
size=1 face="Courier New"><span style='font-size:9.0pt;font-family:"Courier New"'>itkRayCastInterpolateImageFunction</span></font><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'> works. Does
anyone know where I can find an example for this class? I tried “itkRayCastInterpolateImageFunctionTest”
from Testing/Code/Algorithms, the “Integral” value is always 0 for
any “query” point. It is because the variable “m_ValidRay”
is always “false”. Does anyone know if this is a problem of the
test code, or the RayCastInterpolate class itself? Any suggestion is highly
appreciated. Thanks!<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Best,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Chong<o:p></o:p></span></font></p>
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