DICOM PS3.3 2020a - Information Object Definitions

10.20 Mandatory View and Slice Progression Direction Macro (Current)
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## 10.20 Mandatory View and Slice Progression Direction Macro

Table 10-24 specifies the Attributes that describe the view, and in the case of cardiac views, the direction of the slices relative to the cardiac anatomy.

Table 10-24. Mandatory View and Slice Progression Direction Macro Attributes

Attribute Name | Tag | Type | Attribute Description
--- | --- | --- | ---
View Code Sequence | (0054,0220) | 1 | Sequence that describes the projection of the anatomic region of interest. Only a single Item shall be included in this Sequence.
>Include Table 8.8-1 “Code Sequence Macro Attributes” | BCID 26 “Nuclear Medicine Projections” unless otherwise specified in invocation.
>View Modifier Code Sequence | (0054,0222) | 2C | View Modifier. Required if needed to fully specify the View. Zero or more Items shall be included in this Sequence.
>>Include Table 8.8-1 “Code Sequence Macro Attributes” | BCID 23 “Cranio-Caudad Angulation” unless otherwise specified in invocation.
Slice Progression Direction | (0054,0500) | 1C | Describes the anatomical direction in which a set of slices is progressing (see Section 10.20.1.1). Meaningful only for cardiac images. Enumerated Values are defined in Section 10.20.1.1. Required if View Code Sequence (0054,0220) equals (103340004, SCT, "Short Axis") or (131185001, SCT, "Vertical Long Axis") or (131186000, SCT, "Horizontal Long Axis"). May be present otherwise.

### 10.20.1 Mandatory View and Slice Progression Direction Macro Attributes

#### 10.20.1.1 Slice Progression Direction

The image or frame order to which the Slice Progression Direction (0054,0500) applies depends on the IOD:

- In the case of Enhanced Multi-frame IODs, in which a Stack ID (0020,9056) may be defined, Stack ID (0020,9056) shall be used, and the slices are considered in order by In Stack Position Number (0020,9057)

- In the case of Multi-frame IODs that are not Enhanced, the slices are considered in encoded frame order

- In the case of single-frame IODs, the order is defined by increasing values of Instance Number

The Enumerated Values depend on the view:

- If View Code Sequence (0054,0220) indicates a short axis view, such as when it equals (103340004, SCT, "Short Axis"):

  Enumerated Values

  APEX_TO_BASE

  BASE_TO_APEX

- If View Code Sequence (0054,0220) indicates a vertical long axis view, such as when it equals (131185001, SCT, "Vertical Long Axis"):

  Enumerated Values

  ANT_TO_INF

    Anterior to Inferior

  INF_TO_ANT

    Inferior to Anterior

- If View Code Sequence (0054,0220) indicates a horizontal long axis view, such as when it equals (131186000, SCT, "Horizontal Long Axis"):

  Enumerated Values

  SEPTUM_TO_WALL

    Septum to Lateral Wall

  WALL_TO_SEPTUM

    Lateral Wall to Septum

### Note

The conditions on the choice of Enumerated Values are relatively general, rather than specific to a single coded view, in order to accommodate the echocardiography views defined in CID 12226 “Echocardiography Image View” in PS3.16 , in addition to the views for CT, MR, NM and PET defined in CID 26 “Nuclear Medicine Projections” in PS3.16 .

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DICOM PS3.3 2020a - Information Object Definitions