Difference between revisions of "Slicer3:Coordinates"

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

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-== Coordinate Definitions ==
+<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
-[[Image:Slicer3-coordinates.png|thumb|right|400px]]
-=== 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.
-* the reader for each file type is required to provide the IJKToRAS mapping.