[Insight-users] [vtkusers] Matching CT and RT dose coordinates

[Xiaofeng Z]

The position of RT Dose grid is usually stored as relative to the referenced image in Grid Frame Offset Vector.  Do you know if GDCM corrected for that?

Xiaofeng Zhao





Date: Wed, 23 Feb 2011 17:38:14 +0000
From: jothybasu at gmail.com
To: gdcm-developers at lists.sourceforge.net; vtkusers at vtk.org; Insight-users at itk.org; python-medphys at googlegroups.com
Subject: [vtkusers] Matching CT and RT dose coordinates

Hi all,

I am trying to overlay an dose shade on a CT slice.I am 
using vtkDICOMImageReader to read the CT and vtkGDCMImageReader to 
display the dose shade.But I am having problem with the coordinates.How 
to relate the coordinates? For e.g: I  get ImagePositionPatient of CT 
image for central slice as [-275,-524,-128.25] and ImagePositionPatient 
for dose as [-228.65,-419.25,-122.5] adn their spacings are 
[1.074,1.074,3] and [2.52.5.2.5] respectively for CT and Rt dose.


The image looks as in the attached figure.

Any hint

Thanks

Jothy

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