Referenced ROI Number Attribute
| Tag | (3006,0084) |
|---|---|
| Type | Required (1) |
| Keyword | ReferencedROINumber |
| Value Multiplicity | 1 |
| Value Representation | Integer String (IS) |
Uniquely identifies ROI representing the bolus specified by ROI Number (3006,0022) in Structure Set ROI Sequence (3006,0020) in Structure Set Module within RT Structure Set IOD referenced by referenced RT Plan in Referenced RT Plan Sequence (300C,0002) in RT General Treatment Record Module.
Structure Set Module
C.8.8.5 Structure Set Module
A structure set defines a set of areas of significance. Each area can be associated with a Frame of Reference and zero or more images. Information that can be transferred with each region of interest (ROI) includes geometrical and display parameters, and generation technique.
Table C.8-41. Structure Set Module Attributes
|
Attribute Name |
Tag |
Type |
Attribute Description |
|---|---|---|---|
|
Structure Set Label |
(3006,0002) |
1 |
User-defined label for Structure Set. |
|
Structure Set Name |
(3006,0004) |
3 |
User-defined name for Structure Set. |
|
Structure Set Description |
(3006,0006) |
3 |
User-defined description for Structure Set. |
|
Instance Number |
(0020,0013) |
3 |
A number that identifies this object Instance. |
|
Structure Set Date |
(3006,0008) |
2 |
Date at which Structure Set was last modified. |
|
Structure Set Time |
(3006,0009) |
2 |
Time at which Structure Set was last modified. |
|
Referenced Frame of Reference Sequence |
(3006,0010) |
3 |
Sequence describing Frames of Reference in which the ROIs are defined. One or more Items are permitted in this Sequence. See Section C.8.8.5.1. |
|
>Frame of Reference UID |
(0020,0052) |
1 |
Uniquely identifies Frame of Reference within Structure Set. |
|
>RT Referenced Study Sequence |
(3006,0012) |
3 |
Sequence of Studies containing Series to be referenced. One or more Items are permitted in this Sequence. See Section C.8.8.5.4. |
|
>>Include Table 10-11 “SOP Instance Reference Macro Attributes” |
|
||
|
>>RT Referenced Series Sequence |
(3006,0014) |
1 |
Sequence describing Series of images within the referenced Study that are used in defining the Structure Set. One or more Items shall be included in this Sequence. |
|
>>>Series Instance UID |
(0020,000E) |
1 |
Unique identifier for the Series containing the images. |
|
>>>Contour Image Sequence |
(3006,0016) |
1 |
Sequence of Items describing images in a given Series used in defining the Structure Set (typically CT or MR images). One or more Items shall be included in this Sequence. |
|
>>>>Include Table 10-3 “Image SOP Instance Reference Macro Attributes” |
|
||
|
Structure Set ROI Sequence |
(3006,0020) |
1 |
ROIs for current Structure Set. One or more Items shall be included in this Sequence. |
|
>ROI Number |
(3006,0022) |
1 |
Identification number of the ROI. The value of ROI Number (3006,0022) shall be unique within the Structure Set in which it is created. |
|
>Referenced Frame of Reference UID |
(3006,0024) |
1 |
Uniquely identifies Frame of Reference in which ROI is defined, specified by Frame of Reference UID (0020,0052) in Referenced Frame of Reference Sequence (3006,0010). |
|
>ROI Name |
(3006,0026) |
2 |
User-defined name for ROI. |
|
>ROI Description |
(3006,0028) |
3 |
User-defined description for ROI. |
|
>ROI Volume |
(3006,002C) |
3 |
Volume of ROI (cubic centimeters). |
|
>ROI Generation Algorithm |
(3006,0036) |
2 |
Type of algorithm used to generate ROI. Defined Terms:
|
|
>ROI Generation Description |
(3006,0038) |
3 |
User-defined description of technique used to generate ROI. |
|
>ROI Derivation Algorithm Identification Sequence |
(3006,0037) |
3 |
Software algorithm that derived the ROI. Only a single Item is permitted in this Sequence. |
|
>>Include Table 10-19 “Algorithm Identification Macro Attributes”. |
|
||
|
>Derivation Code Sequence |
(0008,9215) |
3 |
A coded description of how this ROI was derived. One or more Items are permitted in this Sequence. See Section C.8.8.5.3 for further explanation. |
|
>>Include Table 8.8-1 “Code Sequence Macro Attributes”. |
Enumerated Value (113085, DCM, "Spatial resampling"). |
||
|
>Definition Source Sequence |
(0008,1156) |
3 |
Instances containing the source of the ROI Contour information. Only a single Item is permitted in this Sequence. |
|
>>Include Table 10-11 “SOP Instance Reference Macro Attributes”. |
|
||
|
>>Referenced Segment Number |
(0062,000B) |
1C |
The value of Segment Number (0062,0004) in the referenced SOP Instance that identifies the segment that is the source of the ROI Contour information. Required if Referenced SOP Class UID (0008,1150) is Segmentation Storage ("1.2.840.10008.5.1.4.1.1.66.4"). |
|
>>Referenced Fiducial UID |
(0070,031B) |
1C |
The value of Fiducials UID (0070,031A) in the referenced SOP Instance that identifies the fiducial that is the source of the ROI Contour information. Required if Referenced SOP Class UID (0008,1150) is Spatial Fiducials Storage ("1.2.840.10008.5.1.4.1.1.66.2"). |
|
Predecessor Structure Set Sequence |
(3006,0018) |
3 |
The Structure Set that has been used to derive the current Structure Set. Only a single Item is permitted in this Sequence. |
|
>Include Table 10-11 “SOP Instance Reference Macro Attributes” |
|
||
C.8.8.5.1 Frames of Reference
The Referenced Frame of Reference Sequence (3006,0010) describes a set of frames of reference in which some or all of the ROIs are expressed. Since the Referenced Frame of Reference UID (3006,0024) is required for each ROI, each Frame of Reference used to express the coordinates of an ROI shall be listed in the Referenced Frame of Reference Sequence (3006,0010) once and only once.
Note
As an example, a set of ROIs defined using a single image Series would list the image Series in a single Referenced Frame of Reference Sequence (3006,0010) Item, providing the UID for this referenced Frame of Reference (obtained from the source images), and listing all pertinent images in the Contour Image Sequence (3006,0016).
C.8.8.5.2 Frame of Reference Relationship Sequence and Transformation Matrix
Retired. See PS3.3-2011.
The concept of definition of registered Frame of References using the Frame of Reference Relationship Sequence (3006,00C0) formerly present in the Standard is retired. The use of Registration IODs is advised since the introduction of Spatial Registration IOD, which is a much stronger and more general concept, and independent from the specifics of RT Structure Sets. Additionally it is of importance that registrations are decoupled from image and segmentation objects.
C.8.8.5.3 ROI Derivation Sequence
If an ROI is created by re-sampling an existing ROI that is either (a) present in a different Frame of Reference (FoR) and has been resampled to align with the image Series referenced by the current structure set, or (b) present in the same FoR, but its contours are referenced to a different image Series, it is useful to be able to identify that the ROI is resampled. The Derivation Code Sequence (0008,9215) shall be used with code (113085, DCM, "Spatial resampling") to indicate the resampled ROI.
C.8.8.5.4 SOP Class UID in RT Referenced Study Sequence
Since RT Referenced Study Sequence (3006,0012) is Type 3, the Attribute may be omitted.
If RT Referenced Study Sequence (3006,0012) is present with an Item, the SOP Class UID of the Detached Study Management SOP Class (Retired) may be used in Referenced SOP Class UID (0008,1150).
RT Structure Set IOD
A.19 RT Structure Set IOD
A.19.1 RT Structure Set IOD Description
The focus for this Radiotherapy Structure Set IOD (RT Structure Set IOD) is to address the requirements for transfer of Patient structures and related data defined on CT scanners, virtual simulation workstations, treatment planning systems and similar devices.
A.19.2 RT Structure Set IOD Entity-Relationship Model
This IOD uses the E-R Model in Section A.1.2, with only the Structure Set IE below the Series IE.
A.19.3 RT Structure Set IOD Module Table
Table A.19.3-1 specifies the Modules of the RT Structure Set IOD.
Table A.19.3-1. RT Structure Set IOD Modules
|
IE |
Module |
Reference |
Usage |
|---|---|---|---|
|
Patient |
Patient |
M |
|
|
Clinical Trial Subject |
U |
||
|
Study |
General Study |
M |
|
|
Patient Study |
U |
||
|
Clinical Trial Study |
U |
||
|
Series |
RT Series |
M |
|
|
Clinical Trial Series |
U |
||
|
Equipment |
General Equipment |
M |
|
|
Frame of Reference |
Frame of Reference |
U - See note 2. |
|
|
Structure Set |
Structure Set |
M |
|
|
ROI Contour |
M |
||
|
RT ROI Observations |
M |
||
|
Approval |
U |
||
|
General Reference |
U |
||
|
SOP Common |
M |
||
|
Common Instance Reference |
U |
Note
-
The Audio Module (Retired) was previously included in this IOD but has been retired. See PS3.3-2004.
-
Previously the Frame of Reference Module was not included (see PS3.3-2014b). Historically, more than one Frame of Reference could be referenced within the Structure Set Module's Referenced Frame of Reference Sequence (3006,0010), in which case the Frame of Reference Module would not have been present.
A.19.4 RT Structure Set IOD Content Constraints
The Defined CID for Purpose of Reference Code Sequence (0040,A170) within Source Instance Sequence (0042,0013) in the General Reference Module shall be CID 7019 “Segmentation Non-Image Source Purposes of Reference”.
RT General Treatment Record Module
C.8.8.17 RT General Treatment Record Module
Table C.8-53. RT General Treatment Record Module Attributes
|
Attribute Name |
Tag |
Type |
Attribute Description |
|---|---|---|---|
|
Instance Number |
(0020,0013) |
1 |
Instance number identifying this particular Instance of the object. |
|
Treatment Date |
(3008,0250) |
2 |
Date when current fraction was delivered, or Date last fraction was delivered in case of RT Treatment Summary Record IOD. See Note. |
|
Treatment Time |
(3008,0251) |
2 |
Time when current fraction was delivered (begun), or Time last fraction was delivered (begun) in case of RT Treatment Summary Record IOD. See Note. |
|
Referenced RT Plan Sequence |
(300C,0002) |
2 |
Reference to a RT Plan. Zero or one Item shall be included in this Sequence. |
|
>Include Table 10-11 “SOP Instance Reference Macro Attributes” |
|
||
|
Referenced Treatment Record Sequence |
(3008,0030) |
3 |
Reference to RT Treatment Records to which the current RT Treatment Record is significantly related. One or more Items are permitted in this Sequence. |
|
>Include Table 10-11 “SOP Instance Reference Macro Attributes” |
|
||
Note
Treatment Date (3008,0250) and Treatment Time (3008,0251) can be used to chronologically order a sequence of treatments, where each treatment is represented by an Instance of a RT Beams Treatment Record or RT Brachy Treatment Record. In the case of a RT Treatment Summary Record, it can be used to identify the period for which the treatment summary is valid. Therefore, implementers are strongly advised to include values for these Attributes whenever possible.