Difference between revisions of "Slicer3:Coordinates"

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== Coordinate Definitions ==
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<big>'''Note:''' We are migrating this content to the slicer.org domain - <font color="orange">The newer page is [https://www.slicer.org/wiki/Slicer3:Coordinates  here]</font></big>
 
 
This page describes the coordinate system assumptions for Slicer3
 
 
 
=== Volumes ===
 
 
 
IJK refers to voxel index coordinates.
 
 
 
RAS refers to Right-Anterior-Superior subject-referenced coordinates.
 
 
 
Each volume includes a transformation to go from voxel indices (IJK) to world (RAS).  This is obtained with the vtkMRMLVolumeNode::GetRASToIJKMatrix(vtkMatrix4x4).
 
 
 
=== Models ===
 
 
 
Model vertices are expressed in millimeters, in RAS space.
 
 
 
=== Fiducials ===
 
 
 
Fiducial points are expressed in millimeters, in RAS space.
 
 
 
=== Transforms ===
 
 
 
All transforms at RAS to RAS transforms.
 
 
 
== Notes ==
 
 
 
* image data in a volume is laid out in memory in the same order as it is read from disk.  That is, the "infamous VTK Y-flip" is ''not'' applied.
 

Latest revision as of 18:07, 10 July 2017

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Note: We are migrating this content to the slicer.org domain - The newer page is here