DICOM PS3.3 2024c - Information Object Definitions
C.36.2.4.12 RT Equipment Mapping and Plan Reference Macro

The RT Equipment Mapping and Plan Reference Macro allows to specify the geometric relationship of the imaging acquisition device and/or patient position to an RT Treatment Delivery Device.

Table C.36.2.4.12-1. RT Equipment Mapping and Plan Reference Macro Attributes

Attribute Name

Tag

Type

Attribute Description

Equipment Frame of Reference UID

(300A,0675)

1C

Frame of Reference identifier for the Treatment Delivery Device.

Required if either Imaging Equipment to Treatment Delivery Device Relationship Sequence (300A,07A1) or Patient to Equipment Relationship Sequence (300A,07A0) is present.

See Section C.36.12.1 and Section C.36.2.4.12.1.1.

Imaging Equipment to Treatment Delivery Device Relationship Sequence

(300A,07A1)

3

The relationship between the coordinate system of the Imaging Device and coordinate system of the Treatment Delivery Device.

Only a single Item is permitted in this Sequence.

See Section 10.39.1.1.

>Device Position to Equipment Mapping Matrix

(3002,010F)

1

A rigid, homogeneous 4x4 transformation matrix that maps the coordinate system of the imaging equipment to the coordinate system of the RT treatment device as identified by Equipment Frame of Reference UID (300A,0675). Matrix elements shall be listed in row-major order.

>Device Position Parameter Sequence

(3002,0110)

2

Translational and rotational parameters for the Imaging Device.

Shall be consistent with the Image to Equipment Mapping Matrix (0028,9520).

Zero or more Items shall be included in this Sequence.

>>Include Table 10-2 “Content Item Macro Attributes”

DTID 15310 “Imaging Device Position Parameters”

Isocenter Position

(300A,012C)

3

Isocenter coordinates (x,y,z), in mm. Specifies the location of the machine isocenter in the Patient-Based Coordinate System associated with the Frame of Reference. It allows transformation from the Equipment-Based Coordinate System to the Patient-Based Coordinate System.

Patient to Equipment Relationship Sequence

(300A,07A0)

3

The relationship between the Patient Frame of Reference and the coordinate system of the Treatment Delivery Device.

Only a single Item is permitted in this Sequence.

>Image to Equipment Mapping Matrix

(0028,9520)

1

A rigid, homogeneous 4x4 transformation matrix that maps the patient coordinate space in the Frame of Reference used for the patient model to the coordinate system of the RT Treatment Delivery Device as identified by Equipment Frame of Reference UID (300A,0675). Matrix elements shall be listed in row-major order.

See Section 10.39.1.1, Section 10.39.1.2 and Section C.7.6.21.1.

>Patient Support Position Parameter Sequence

(300A,065B)

2

Translational and rotational parameters for the Patient Support device.

Shall be consistent with the Image to Equipment Mapping Matrix (0028,9520).

Zero or more Items shall be included in this Sequence.

>>Include Table 10-2 “Content Item Macro Attributes”

DTID 15302 “Patient Support Position Parameters”

Patient Treatment Preparation Sequence

(300A,079F)

3

Procedures and devices required to prepare a patient for treatment.

Only a single Item is permitted in this Sequence.

See Section C.8.8.12.1.3.

>Include Table C.36.2.3.4-1 “RT Patient Treatment Preparation Macro Attributes”.

Referenced RT Plan Sequence

(300C,0002)

3

RT Plan Instance associated with the acquisition of this Instance.

Only a single Item is permitted in this Sequence.

>Include Table 10-11 “SOP Instance Reference Macro Attributes”

>Referenced Beam Sequence

(300C,0004)

3

Beams in referenced RT Plan Instance that are relevant for the acquisition of this Instance.

One or more Items are permitted in this Sequence.

>>Referenced Beam Number

(300C,0006)

1

Uniquely identifies Beam specified by Beam Number (300A,00C0) in Beam Sequence (300A,00B0) within referenced RT Plan or in Ion Beam Sequence (300A,03A2) within RT Ion Plan.


C.36.2.4.12.1 RT Equipment Mapping and Plan Reference Macro Attributes Description
C.36.2.4.12.1.1 Equipment Frame of Reference UID

The Equipment Frame of Reference UID (300A,0675) identifies the Equipment Coordinate System for a Treatment Delivery Device.

If the Equipment Frame of Reference UID of a Treatment Delivery Device is not a Well-known Frame of Reference defined in Section C.36.12.2, it is expected that the coordinate systems and the axis parameters of the Treatment Delivery Device are documented in the Conformance Statement for that device.

DICOM PS3.3 2024c - Information Object Definitions