Bones for registration

[Dhruv Jain]

Hi, 

I would like to register ct and cbct images, using only the bones (hu). I can do a thresholding, but I wanted to know if it is already implemented by plastimatch register ??

Thanks Again..

Best Regards,

Dhruv

[Dhruv Jain]

Hi Again, 

When I use standard ct-cbct images, it is getting registered, but when I am using thresholded image (image>500) for bone registration, I am getting this error 

VersorRigid3DTransformOptimizer: Cost function error after 1 iterations. itk::ERROR: MeanSquaresImageToImageMetric(0x7f3b98005740): Too many samples map outside moving image buffer: 38864 / 524288

Also my file is like this - 

[GLOBAL]

moving =bones1.nrrd
fixed = bones2.nrrd
img_out =ct_reg.nii
xform_out = rigid_transformation.txt
[STAGE]
xform = align_center
[STAGE]
xform=rigid
optim=versor
max_its = 300
res = 4 4 2

Please HELP

[Paolo Zaffino]

Hi,

I would suggest using something like mi, nmi, or mattes.

Please, could you try this second stage (mi_histogram_bins can be smaller)?

[STAGE]
metric=mattes
xform=rigid
optim=versor
impl=itk
res=1 1 1
max_its=500
max_step=1.0
min_step=0.001
num_samples=0.3
mi_histogram_bins=256
rsg_grad_tol=0.00000000001
translation_scale_factor=200

Best,

Paolo

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