DICOM PS3.3 2021b - Information Object Definitions

C.8.8.2.3 Image Plane Pixel Spacing and RT Image SID (Current)
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##### C.8.8.2.3 Image Plane Pixel Spacing and RT Image SID

The Image Plane Pixel Spacing (3002,0011) Attribute shall always be defined on the image plane, i.e., at the radiation machine source to image plane distance specified by RT Image SID (3002,0026). For images where the source-image distance is undefined or unknown (e.g., DRR images), RT Image SID (3002,0026) shall equal Radiation Machine SAD (3002,0022) and Image Plane Pixel Spacing (3002,0011) shall be defined on this common plane.

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DICOM PS3.3 2021b - Information Object Definitions