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PatientMModule - Patient
Clinical Trial SubjectUModule - Patient
General StudyMModule - Study
Patient StudyUModule - Study
Clinical Trial StudyUModule - Study
General SeriesMModule - Series
CT SeriesMModule - Series
Clinical Trial SeriesUModule - Series
Frame of ReferenceMModule - Frame of Reference
SynchronizationUModule - Frame of Reference
General EquipmentMModule - Equipment
Enhanced General EquipmentUModule - Equipment
Image PixelMModule - Image
Contrast/BolusUModule - Image
Enhanced Contrast/BolusUModule - Image
Multi-frame Functional GroupsMModule - Image
Multi-frame DimensionUModule - Image
(0020,9221) Dimension Organization Sequence1Sequence
(0020,9222) Dimension Index Sequence1CSequence
(0020,9164) Dimension Organization UID1Unique Identifier
(0020,9165) Dimension Index Pointer1Attribute Tag
(0020,9167) Functional Group Pointer1CAttribute Tag
(0020,9213) Dimension Index Private Creator1CLong String
(0020,9238) Functional Group Private Creator1CLong String
(0020,9421) Dimension Description Label3Long String
(0020,9311) Dimension Organization Type3Code String
Cardiac SynchronizationUModule - Image
Respiratory SynchronizationUModule - Image
Acquisition ContextMModule - Image
DeviceUModule - Image
SpecimenUModule - Image
Enhanced CT ImageMModule - Image
SOP CommonMModule - Image
Common Instance ReferenceUModule - Image
Frame ExtractionCModule - Image
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Corneal Topography MapCIOD
Breast Projection X-Ray ImageCIOD
Parametric MapCIOD
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Tractography ResultsCIOD
RT Brachy Application Setup Delivery InstructionCIOD
Planar MPR Volumetric Presentation StateCIOD
Volume Rendering Volumetric Presentation StateCIOD
Content Assessment ResultsCIOD
CT Performed Procedure ProtocolCIOD
CT Defined Procedure ProtocolCIOD
Protocol ApprovalCIOD
XA Performed Procedure ProtocolCIOD
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Ophthalmic Optical Coherence Tomography En Face ImageCIOD
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Encapsulated STLCIOD
Encapsulated OBJCIOD
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RT Physician IntentCIOD
RT Segment AnnotationCIOD
RT Radiation SetCIOD
C-Arm Photon-Electron RadiationCIOD
Tomotherapeutic RadiationCIOD
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RT Radiation Record SetCIOD
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RT Radiation Set Delivery InstructionCIOD
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Basic DirectoryCIOD

Built with by Innolitics, a team of medical imaging software developers.

Data synced with official DICOM standard on 18 April 2024. The DICOM Standard is under continuous maintenance, and the current official version is available at http://www.dicomstandard.org/current/. DICOM Parts 3, 4, and 6, © NEMA. Please note that the most recent PDF version of the standard is the official reference, and should checked when making technical decisions.

Functional Group Pointer Attribute

Tag(0020,9167)
TypeConditionally Required (1C)
KeywordFunctionalGroupPointer
Value Multiplicity1
Value RepresentationAttribute Tag (AT)

Contains the Data Element Tag of the Functional Group Sequence that contains the Attribute that is referenced by the Dimension Index Pointer (0020,9165).

See Section C.7.6.17.1 for further explanation.

Required if the value of Dimension Index Pointer (0020,9165) is the Data Element Tag of an Attribute that is contained within a Functional Group Sequence.

Section C.7.6.17.1

C.7.6.17.1 Dimension Indices

With the Dimension Index Sequence (0020,9222), Data Element Tags are specified that identify the indices used for a particular SOP Instance.

The actual index values for each frame in a multi-frame header are stored in a single Dimension Index Values Attribute (0020,9157) defined in the Frame Content Functional Group. For each SOP Instance this Attribute has a Value Multiplicity equal to the number of Items in the Sequence. The ordering of the Items in the Sequence defines the ordering in the Dimension Index Values Attribute: Item 1 of the Sequence relates to Value 1, Item 2 to Value 2, etc.

The Dimension Index Pointer (0020,9165) references a single Attribute that describes the actual values that define the dimension. Each Attribute referenced in the Dimension Index Sequence (0020,9222) will have an index stored in the Dimension Index Values (0020,9157) for each frame. Each index value is an ordinal number starting from 1 and monotonically increasing by 1 within the scope of a Dimension Organization UID (0020,9164). These values are independent of the actual values of the Attribute referenced by the Dimension Index Pointer (0020,9165), i.e., the index values are logical indices, rather than actual indices. Frames assigned the same index shall contain nominally the same value for the referenced Attribute. If the referenced Attribute is not present for some frames, or is present but has no value, then a single index shall be assigned to indicate the lack of the value (i.e., all such frames shall have the same index value, which is different from other index values). It is at the discretion of the SOP Instance creator whether the Attribute values are equivalent, and therefore appropriate for assignment to the same index value.

The Dimension Index Pointer (0020,9165) shall contain the Data Element Tag (gggg,eeee) of the Attribute being indexed.

The Dimension Index Pointer (0020,9165) shall not contain the Data Element Tag for Frame Content Sequence (0020,9111) or Dimension Index Values (0020,9157).

Note

  1. Dimension Index Pointer (0020,9165) may point to a Sequence containing a Functional Group. In that case all the Attributes of the Sequence are associated with the index value.

  2. The Dimension Index Pointer (0020,9165) may point to a Data Element Tag (gggg,eeee) that is not present for all frames of an object, or does not have a value for all frames of an object. For such frames, index values are still assigned, as described above.

  3. The indices used in the Dimension Index Values (0020,9157) may or may not be identical to the value of indexed Attribute referenced by Dimension Index Pointer (0020,9165). For example, if the referenced Attribute is itself encoded in an index-like fashion (being an ordinal number starting from 1), such as In-Stack Position Number (0020,9057), then index value 1 would typically correspond to In-Stack Position Number (0020,9057) value 1. On the other hand, if the referenced Attribute encodes some physical measure, such as a time or distance, or a categorical value, such as a string describing the phase of contrast, or a more complex description such as an entire Functional Group, then the index value is independent of the encoded value.

  4. The scope of the values of Dimension Index Pointer (0020,9165) is defined to be within a single Dimension Organization UID (0020,9164). If the same Dimension Organization UID (0020,9164) is present in multiple Instances (whether part of a Concatenation or not), at least one of those Instances (though not necessarily every Instance) will contain a value of 1 for the Dimension Index Values (0020,9157).

The Functional Group Pointer (0020,9167) value is the Data Element Tag (gggg,eeee) of the Functional Group Sequence that contains the Attribute being indexed. If the Dimension Index Pointer (0020,9165) contains a Data Element Tag that identifies a Functional Group Sequence then the Functional Group Pointer (0020,9167) shall not be present.

If the Dimension Index Pointer (0020,9165) Attribute contains a Private Data Element, then the Dimension Index Private Creator (0020,9213) shall contain the Private Creator of the block of Private Data Elements.

If the Functional Group Pointer (0020,9167) Attribute contains a Private Data Element, then the Functional Group Private Creator (0020,9238) shall contain the Private Creator of the block of Private Data Elements.

Note

An example of the usage of the Dimension Index Sequence (0020,9222) and Dimension Index Values (0020,9157) Attributes:

Dimension Index Sequence (0020,9222) specifies two indices:

  • Cardiac Trigger Delay Time (0020,9153)

  • Image Position (Patient) (0020,0032)

The Dimension Index Sequence (0020,9222) is filled with the following contents:

Item

Attribute

Value

1

Dimension Index Pointer

(0020,9153)

Functional Group Pointer

(0018,9118)

2

Dimension Index Pointer

(0020,0032)

Functional Group Pointer

(0020,9113)

The Dimension Index Values (0020,9157) (in the Frame Content Functional Group) for each frame consists of two values:

Index of Cardiac Trigger Delay Time \ Index of Image Position

The SOP Instance creator is responsible for maintaining consistency between the actual value of the Attribute listed as the Dimension Index Pointer (0020,9165) and the corresponding value in the Dimension Index Values (0020,9157) Attribute.

See Figure C.7.6.17-1 for an illustration of this example.

Figure C.7.6.17-1. Example of Dimension Index Sequence and Dimension Index Values Attributes