DICOM PS3.3 2019c - Information Object Definitions
C.8.8.2.7 RT Image Plane, Position and Orientation

When RT Image Plane (3002,000C) is NORMAL and RT Image Orientation (3002,0010) is not provided, the orientation is defined as follows: The image viewing direction shall be from the radiation source to the image (i.e., in the sense of a beam's eye view, or along the negative Zr direction of the IEC X-RAY IMAGE RECEPTOR coordinate system).

If RT Image Plane is NON_NORMAL, any rotation defined by RT Image Orientation is performed about the origin of the IEC X-RAY IMAGE RECEPTOR coordinate system. The definitions of the x and y coordinates of the RT Image Position (3002,0012) are defined before any rotation of the image plane is taken into account, see Figure C.8.8.2.7-1.

The direction of rows shall be along the positive Xr direction and the direction of the columns shall be along the negative Yr direction of the IEC X-RAY IMAGE RECEPTOR coordinate system.

Non-normal Image Plane

Figure C.8.8.2.7-1. Non-normal Image Plane


DICOM PS3.3 2019c - Information Object Definitions