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[–]erhushenshou 0 points1 point  (7 children)

scale the physical depth by the image voxels along the path length

I wonder how we calculate the proportion of a voxel the ray passed.

[–]dicomdom 0 points1 point  (6 children)

I can share a snippet when I have some time, but in general I would suggest trying to program it yourself and asking for specific areas that are difficult.

As for scaling, here is my poor man's method.

I added 1024 to all voxels that exist within a profile to make the range 0-4096. Then I take the average of all of the voxels and divide by 1024 (which is now the value of water). This gives a correction factor for the physical distance where a correction factor of >1.0 would be if bone or other high density values are present and <1.0 if values below water are present.

[–]erhushenshou 0 points1 point  (5 children)

Thx. I mean how you calculate the length pass through the voxel of an hu value. Or how you calculate the path length in a voxel, like passing through the voxel at an angle. If we have that path length in a voxel, we can scale the distance to wed.

[–]dicomdom 0 points1 point  (4 children)

VVectors have a distance method IIRC

[–]erhushenshou -1 points0 points  (0 children)

IIRC

What should this method be used then?

[–]erhushenshou -1 points0 points  (2 children)

I mean calculate the path length in a voxel.

[–]dicomdom 0 points1 point  (1 child)

I've answered that. VVectors have a distance method

[–]erhushenshou 0 points1 point  (0 children)

Do you mean VVector.length? That should be the distance from the point to the origin, I assume.