Dear Michael,
Thanks for this report. We've had a similar problem in the past where a slight
misalignment between voxel and surface representations (generated via marching
cube) of the same data occurred.
When freely rotating MPR planes there is always an accuracy tradeoff. In a
strict sense, the "pixels" retrieved from resampling will usually not be
rectangular but can be triangles, pentagons, etc. However, for simplicity and
convention the resampling approximates the resampled 2D with rectangular
pixels. This approximation may be responsible for a slight "shift" that can
sometimes be observed
It seems strange however that in your case this shift seems to be more
pronounced in one plane than in the other...
I'm not sure if I correctly understand what you mean by
> Also, when rotating the plane in one of the views, the other one may jump
> left an right (which looks like a rounding problem).
If it is not too big (<10 MB), could you send the dataset to my email address
so that we can have look at this?
Regards,
Mathias
From: Kelm, Michael [mailto:[email protected]]
Sent: Friday, February 13, 2009 10:18 PM
To: [email protected]
Subject: [mitk-users] 3d cursor displacement
Dear MITK developers,
while working with MITK I noticed a certain displacement of the 3d cursor
between the MPRs when viewing an askew plane of a volume (in plane slicing
mode). While in one of the orthogonal views the cursor is centered on a dark
voxel, another view shows a bright voxel under the cursor. Also, when rotating
the plane in one of the views, the other one may jump left an right (which
looks like a rounding problem).
Is this problem known/ has been fixed? I am on revision 14570.
I have attached a screenshot that illustrates the problem on an artificial data
volume.
I would be happy to share it for locating and fixing the problem!
Best regards,
Michael Kelm.
Siemens AG
Corporate Technology
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