DICOM PS3.3 2020b - Information Object Definitions |
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This section describes the Image - Equipment Coordinate Relationship Module. Table C.7.6.21-1 contains the Attributes that specify how the equipment (e.g., gantry) and patient oriented coordinate system (in conjunction with Image Position (Patient) (0020,0032) and Image Orientation (Patient) (0020,0037) Attributes) are related.

**Table C.7.6.21-1. Image - Equipment Coordinate Relationship Module Attributes**

A 4x4 rigid transformation matrix that maps patient coordinate space of the reconstructed image to the equipment defined original coordinate space. Matrix elements shall be listed in row-major order. See Section C.7.6.21.1. |
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Identification of the type of equipment coordinate system in which the projection images were acquired. See Section C.7.6.21.2. |

The Image to Equipment Mapping Matrix (0028,9520) is used to describe the relationship between the patient oriented coordinate system and a modality specific equipment coordinate system. This mapping can only be used with systems that have a well-defined equipment coordinate system (such as XA, etc.).

The Image to Equipment Mapping Matrix ^{A}M_{B} describes how to transform a point (^{B}x,^{B}y,^{B}z) with respect to the Patient-Based Coordinate System into (^{A}x,^{A}y,^{A}z) with respect to the equipment coordinate system according to the equation below.

The Image to Equipment Mapping Matrix is a rigid transformation that involves only translations and rotations. Mathematically, the matrix shall be orthonormal and can describe six degrees of freedom: three translations, and three rotations.

DICOM PS3.3 2020b - Information Object Definitions |
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