Device Position to Equipment Mapping Matrix Attribute
| Tag | (3002,010F) |
|---|---|
| Type | Required (1) |
| Keyword | DevicePositionToEquipmentMappingMatrix |
| Value Multiplicity | 16 |
| Value Representation | Double (FD) |
A rigid, homogeneous 4x4 transformation matrix that maps the Imaging Source Coordinate System to the Equipment Coordinate System. Matrix elements shall be listed in row-major order.
See Section C.36.1.1.11.
Note
Part of the RT Image Frame Imaging Device Position Functional Group Macro with usage: M
Section C.36.1.1.11
C.36.1.1.11 Imaging Source Coordinate System
TheImaging Source Coordinate System describes the location of the imaging source with respect to the Equipment Frame of Reference coordinate system identified by the Equipment Frame of Reference UID (300A,0675) , i.e. the Equipment Frame of Reference coordinate system is the parent system of the Imaging Source Coordinate System.
The Device Position to Equipment Mapping Matrix (3002,010F) relates the two coordinate systems, and when it is identity:
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The origin of Imaging Source Coordinate System is located at the origin of the Equipment Frame of Reference coordinate system
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The axes of Imaging Source Coordinate System are aligned with the axes of the Equipment Frame of Reference coordinate system
The Imaging Source Coordinate System is aligned with the imaging source as follows:
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The origin of the Imaging Source Coordinate System is the nominal location of the imaging source.
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The z-axis is aligned with the central ray of the diverging rays of the imaging source
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The positive z-axis is in the direction from the image receptor to the imaging source
Beam modifying devices attached to the imaging source, such as Beam Limiting Devices, use a Base Beam Modifier Coordinate System, if they use coordinates in their specification.
The Base Beam Modifier Coordinate System, defined in Section C.36.1.1.9 Beam Modifier Coordinate System, is related to the Image Source Coordinate System as follows:
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The parent system of theBase Beam Modifier Coordinate Systemis the Imaging Source Coordinate System.
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The Base Beam Modifier Plane is located at a distance specified by RT Beam Modifier Definition Distance (300A,0688) along the z-axis from the reference location specified by RT Device Distance Reference Location Code Sequence (300A,0659).
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If the radiation used for imaging is generated by an imaging-specific source, the RT Device Distance Reference Location Code Sequence (300A,0659) shall have the value (130789, DCM, "Nominal Imaging Source Location")
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If the radiation used for imaging is generated by the therapeutic source ("MV Imaging") , the RT Device Distance Reference Location Code Sequence (300A,0659) shall have the value (130358, DCM, "Nominal Radiation Source Location")