[Insight-users] 2D/3D Intensity based registration

[philstone]

hi pafal,
we are currently working on an ITK-based multi-resolution 2D/3D registration
framework which is - hopefully - a bit easier to configure (the X-ray
geometry) than the InsightApplication-example. it will support (in contrast
to ITK's RayCaster) a) multi-threaded DRR-generation, b) ray-casting and
wobbled splatting, c) intensity transfer functions and d) affine
transformations of the input volume. depending on our work-progress and time
we can invest on this little project, we are going to submit it to the
insight-journal next month (I think ...).
regards
phil



pafal wrote:
> 
> I have searched the forums for IntensityBased2D3DRegistration and as of
> yet I have not come with a concrete response to my question.
> 
> By sifting through the IntensityBased2D3DRegistration.cxx code in great
> detail, I gather the pipeline is as follows:
> 
> a) read 3D volume
> b) raycast the 3D volume into a DRR image
> c) similarity metric between DRR image and user input 2D image
> d) optimizwe transforms.
> 
> 
> Questions:
> 
> 1- if I have three 2D images, can I use these images to estimate the pose
> (6 d.o.f) of the volume, or is this .cxx file only valid for a single 2D
> image to 3D volume registration?
> 
> 2- Is it possible initializing the transforms to identity, just like in
> the 3D/3D registration examples and hope that the algorithm will optimize
> the transforms close to their true values?
> 
> 3- I'm confused with the Readme.txt file. The pipeline is to first execute
> GenerateProjection by projecting brainweb165a10f17.mha and saving into
> projection.mhd. 
> 
> Then we take  projection.mhd  and compare it with our own 2D image by
> calling IntensityBased2D3DRegistration??
> 
> 
> 4- Are the command lines in Readme.txt copy pasted into batch files?
> 
> 
> 
> any insight on this would be monumental for me.
> 
> thank you 
> 
> regards
> 
> P.
> 

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