10.20 Mandatory View and Slice Progression Direction Macro
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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 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” | Baseline CID 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” | Baseline CID 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 (G-A186, SRT,"Short Axis") or (G-A18A,SRT,"Vertical Long Axis") or (G-A18B,SRT, "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 (G-A186, SRT,"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 (G-A18A,SRT,"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 (G-A18B,SRT, "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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