DICOM PS3.3 2020c - Information Object Definitions

C.7.6.14 Acquisition Context Module (Current)
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#### C.7.6.14 Acquisition Context Module

Table C.7.6.14-1 specifies Attributes for description of the conditions present during data acquisition.

This Module shall not contain descriptions of conditions that replace those that are already described in specific Modules or Attributes that are also contained within the IOD that contains this Module.

### Note

1. Each Item of the Acquisition Context Sequence (0040,0555) contains one Item of the Concept Name Code Sequence (0040,A043) and one of the mutually-exclusive Observation-value Attributes: Concept Code Sequence (0040,A168), the pair of Numeric Value (0040,A30A) and Measurement Units Code Sequence (0040,08EA), Date (0040,A121), Time (0040,A122), Person Name (0040,A123) or Text Value (0040,A160).

2. If this SOP Instance is a Multi-frame SOP Instance, each Item of the Acquisition Context Sequence (0040,0555) may be configured to describe one frame, all frames, or any specifically enumerated subset set of frames of the Multi-frame SOP Instance. Previously, Referenced Frame Numbers (0040,A136) was used to enumerate which frames were described, but its length was limited, so it has been replaced by Referenced Frame Number (0008,1160).

Table C.7.6.14-1. Acquisition Context Module Attributes

Attribute Name | Tag | Type | Attribute Description
--- | --- | --- | ---
Acquisition Context Sequence | (0040,0555) | 2 | A Sequence of Items that describes the conditions present during the acquisition of the data of the SOP Instance. Zero or more Items shall be included in this Sequence.
>Value Type | (0040,A040) | 3 | The type of the value encoded in this Item. Defined Terms: TEXT NUMERIC CODE DATE TIME PNAME See Section 10.2.
>Observation DateTime | (0040,A032) | 3 | The date and time on which this Item was completed. For the purpose of recording measurements or logging events, completion time is defined as the ending time of data acquisition of the measurement, or the ending time of occurrence of the event.
>Concept Name Code Sequence | (0040,A043) | 1 | A concept that constrains the meaning of (i.e., defines the role of) the Observation Value. The "Name" component of a Name/Value pair. Only a single Item shall be included in this Sequence.
>>Include Table 8.8-1 “Code Sequence Macro Attributes” | No Baseline CID is defined.
>Referenced Frame Number | (0008,1160) | 1C | References one or more frames in a Multi-frame SOP Instance. The first frame shall be denoted as frame number one. Required if this SOP Instance is a Multi-frame SOP Instance and the values in this Sequence Item do not apply to all frames.
>Numeric Value | (0040,A30A) | 1C | This is the Value component of a Name/Value pair when the Concept implied by Concept Name Code Sequence (0040,A043) is a set of one or more numeric values. Required if the value that Concept Name Code Sequence (0040,A043) requires (implies) is a set of one or more integers or real numbers. Shall not be present otherwise.
>Floating Point Value | (0040,A161) | 1C | The floating point representation of Numeric Value (0040,A30A). The same number of values as Numeric Value (0040,A30A) shall be present. Required if Numeric Value (0040,A30A) has insufficient precision to represent the value as a string. May be present otherwise.
>Rational Numerator Value | (0040,A162) | 1C | The integer numerator of a rational representation of Numeric Value (0040,A30A). Encoded as a signed integer value. The same number of values as Numeric Value (0040,A30A) shall be present. Required if Numeric Value (0040,A30A) has insufficient precision to represent a rational value as a string. May be present otherwise.
>Rational Denominator Value | (0040,A163) | 1C | The integer denominator of a rational representation of Numeric Value (0040,A30A). Encoded as a non-zero unsigned integer value. The same number of values as Numeric Value (0040,A30A) shall be present. Required if Rational Numerator Value (0040,A162) is present.
>Measurement Units Code Sequence | (0040,08EA) | 1C | Units of measurement. Only a single Item shall be included in this Sequence. Required if Numeric Value (0040,A30A) is present. Shall not be present otherwise.
>>Include Table 8.8-1 “Code Sequence Macro Attributes” | BCID 82 “Units of Measurement”.
>Date | (0040,A121) | 1C | This is the Value component of a Name/Value pair when the Concept implied by Concept Name Code Sequence (0040,A043) is a date. ### Note The purpose or role of the date value could be specified in Concept Name Code Sequence (0040,A043). Required if the value that Concept Name Code Sequence (0040,A043) requires (implies) is a date. Shall not be present otherwise.
>Time | (0040,A122) | 1C | This is the Value component of a Name/Value pair when the Concept implied by Concept Name Code Sequence (0040,A043) is a time. ### Note The purpose or role of the time value could be specified in Concept Name Code Sequence (0040,A043). Required if the value that Concept Name Code Sequence (0040,A043) requires (implies) is a time. Shall not be present otherwise.
>Person Name | (0040,A123) | 1C | This is the Value component of a Name/Value pair when the Concept implied by Concept Name Code Sequence (0040,A043) is a Person Name. ### Note The role of the person could be specified in Concept Name Code Sequence (0040,A043). Required if the value that Concept Name Code Sequence (0040,A043) requires (implies) is a person name. Shall not be present otherwise.
>Text Value | (0040,A160) | 1C | This is the Value component of a Name/Value pair when the Concept implied by Concept Name Code Sequence (0040,A043) is a Text Observation Value. Required if Date (0040,A121), Time (0040,A122), and Person Name (0040,A123) do not fully describe the concept specified by Concept Name Code Sequence (0040,A043). Shall not be present otherwise.
>Concept Code Sequence | (0040,A168) | 1C | This is the Value component of a Name/Value pair when the Concept implied by Concept Name Code Sequence (0040,A043) is a Coded Value. Only a single Item shall be included in this Sequence. Required if Date (0040,A121), Time (0040,A122), Person Name (0040,A123), Text Value (0040,A160), and the pair of Numeric Value (0040,A30A) and Measurement Units Code Sequence (0040,08EA) are not present.
>>Include Table 8.8-1 “Code Sequence Macro Attributes” | No Baseline CID is defined.
Acquisition Context Description | (0040,0556) | 3 | Free-text description of the image-acquisition context.

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DICOM PS3.3 2020c - Information Object Definitions