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annotate OrthancStone/Resources/Documentation/Coordinates.txt @ 1775:fca942f4b4a7

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fix conversion from voxel centers to texture borders
author Sebastien Jodogne <s.jodogne@gmail.com>
date Wed, 12 May 2021 19:57:50 +0200
parents
children 9ab251c03eda
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1775
fca942f4b4a7 fix conversion from voxel centers to texture borders
Sebastien Jodogne <s.jodogne@gmail.com>
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1
fca942f4b4a7 fix conversion from voxel centers to texture borders
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2 Some notes about the coordinate systems
fca942f4b4a7 fix conversion from voxel centers to texture borders
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3 =======================================
fca942f4b4a7 fix conversion from voxel centers to texture borders
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4
fca942f4b4a7 fix conversion from voxel centers to texture borders
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5 * The 3D coordinates are expressed in the PATIENT system, *not* the
fca942f4b4a7 fix conversion from voxel centers to texture borders
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6 "gantry" coordinates. As a consequence, the tags "Image Position
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7 Patient" (0020,0032) and "Image Orientation Patient" (0020,0037)
fca942f4b4a7 fix conversion from voxel centers to texture borders
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8 describe the 3D geometry of a slice.
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9
fca942f4b4a7 fix conversion from voxel centers to texture borders
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10 * The tag "Patient Position" (0018,5100) could be used to convert from
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11 patient coordinates to gantry coordinates, but this would be useful
fca942f4b4a7 fix conversion from voxel centers to texture borders
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12 to device manufacturers, whereas Stone primarly deals with users of
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13 modalities.
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15 * The "Image Position Patient" gives the 3D coordinates of the CENTER
fca942f4b4a7 fix conversion from voxel centers to texture borders
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16 of the voxel of slice.
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17
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18 * In 2D compositors, the origin of a texture corresponds to the CORNER
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19 of the texture (*not* to the center of the first pixel). Roughly
fca942f4b4a7 fix conversion from voxel centers to texture borders
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20 speaking, the operation "floor()" must be applied to move from
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21 floating coordinates to pixel coordinates.
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23 * The classes deriving from "IVolumeSlicer" must pay to attention to
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24 convert from centers of 3D voxels to bounding boxes of 2D pixels.