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What is the difference between dicomrt2matlab's contours.points and contours.VoxPoints?

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Daniel Bridges
Daniel Bridges 2016-5-16
编辑： Daniel Bridges 2016-5-16
What is the difference between dicomrt2matlab 's contours.Points and contours.VoxPoints?
One set appears flipped over the z-axis with different z-values; compare:
scatter3(contours(9).Points(:,1),contours(9).Points(:,2),contours(9).Points(:,3))
scatter3(contours(9).VoxPoints(:,1),contours(9).VoxPoints(:,2),contours(9).VoxPoints(:,3))
I am currently working to answer this question. readRTstructures contains the answer, e.g.:
contours(i).Points = vertcat(segments{:});
%%Save contour points in voxel coordinates
contours(i).VoxPoints = xfm \ [contours(i).Points ones(size(contours(i).Points,1), 1)]';
contours(i).VoxPoints = contours(i).VoxPoints(1:3,:)';
I suppose it involves the DICOM orientation; this webpage appears to be their source for xfm. getAffineXfm writes:
% Based on http://nipy.sourceforge.net/nibabel/dicom/dicom_orientation.html
It appears to me Points stores a representation of the contour surface for MATLAB, whereas VoxPoints is the equivalent for DICOM, according to nipy.org.

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