DICOM PS3.3 2021d - Information Object Definitions

C.18 Content Macros (Current)
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## C.18 Content Macros

### C.18.1 Numeric Measurement Macro

Table C.18.1-1 specifies the Attributes that convey a NUM (numeric measurement) value.

### Note

The Measured Value Sequence (0040,A300) may be empty to convey the concept of a measurement whose value is unknown or missing, or a measurement or calculation failure. Whether or not an Item is required may be controlled by the Template that defines the use of this Content Item. See PS3.16 Section 6.1.7 in PS3.16 . If the Sequence is empty, neither the value nor the units will be sent.

Table C.18.1-1. Numeric Measurement Macro Attributes

Attribute Name | Tag | Type | Attribute Description
--- | --- | --- | ---
Measured Value Sequence | (0040,A300) | 2 | This is the value of the Content Item. Shall consist of a Sequence of Items conveying the measured value(s), which represent integers or real numbers and units of measurement. Zero or one Item shall be included in this Sequence.
>Numeric Value | (0040,A30A) | 1 | Numeric measurement value. Only a single value shall be present.
>Floating Point Value | (0040,A161) | 1C | The floating point representation of Numeric Value (0040,A30A). Only a single value 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. Only a single value 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. Only a single value shall be present. Required if Rational Numerator Value (0040,A162) is present.
>Measurement Units Code Sequence | (0040,08EA) | 1 | Units of measurement. Only a single Item shall be included in this Sequence.
>>Include Table 8.8-1 “Code Sequence Macro Attributes” | DCID 82 “Units of Measurement”.
Numeric Value Qualifier Code Sequence | (0040,A301) | 1C | Qualification of Numeric Value (0040,A30A) in Measured Value Sequence (0040,A300), or reason for absence of Measured Value Sequence (0040,A300) Item. Only a single Item is permitted in this Sequence. Required if Measured Value Sequence (0040,A300) is empty.
>Include Table 8.8-1 “Code Sequence Macro Attributes” | DCID 42 “Numeric Value Qualifier”.

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DICOM PS3.3 2021d - Information Object Definitions