C.8.25.14.3 Ophthalmic Axial Measurements Related Information Macro
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##### C.8.25.14.3 Ophthalmic Axial Measurements Related Information Macro

Table C.8.25.14-4 describes the attributes for the Ophthalmic Axial Measurements Related Information Macro.

Table C.8.25.14-4. Ophthalmic Axial Measurements Related Information Macro Attributes

Attribute Name | Tag | Type | Attribute Description
--- | --- | --- | ---
Ultrasound Ophthalmic Axial Length Measurements Sequence | (0022,1220) | 1C | Related information about an axial length measurement being performed on an ultrasound device. Only a single Item shall be included in this Sequence. Required if Ophthalmic Axial Measurements Device Type (0022,1009) is ULTRASOUND.
>Ophthalmic Axial Length Velocity | (0022,1059) | 1 | The sound velocity used in calculating the Ophthalmic Axial Length Measurement Value (0022,1019), in m/sec.
>Observer Type | (0040,A084) | 1 | Method used to select which acquired axial length measurement values are kept. Enumerated Values: PSN Person; manually selected DEV Device; automatically selected See Section C.8.25.14.1.1.5 for further explanation.
>Ophthalmic Axial Length Data Source Code Sequence | (0022,1150) | 1 | Source of the value recorded in Ophthalmic Axial Length (0022,1019). Only a single Item shall be included in this Sequence.
>>Include Table 8.8-1 “Code Sequence Macro Attributes” | Defined CID 4240 “Ophthalmic Measurement or Calculation Data Source”
>Ophthalmic Axial Length Data Source Description | (0022,1159) | 3 | A free text description of the axial length measurement data source.
Optical Ophthalmic Axial Length Measurements Sequence | (0022,1225) | 1C | Related information about an axial length measurement being performed on an optical device. Only a single Item shall be included in this Sequence. Required if Ophthalmic Axial Measurements Device Type (0022,1009) is OPTICAL.
>Signal to Noise Ratio | (0022,1155) | 1C | The ratio of signal power to the background noise power (Psignal / Pnoise). Required if Ophthalmic Axial Length Measurements Type (0022,1010) is TOTAL LENGTH. May be present otherwise.
>Ophthalmic Axial Length Data Source Code Sequence | (0022,1150) | 1 | The source of the value in Ophthalmic Axial Length (0022,1019). Only a single Item shall be included in this Sequence.
>>Include Table 8.8-1 “Code Sequence Macro Attributes” | Defined CID 4240 “Ophthalmic Measurement or Calculation Data Source”
>Ophthalmic Axial Length Data Source Description | (0022,1159) | 3 | A free text description of the axial length measurement data source.

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C.8.25.14.2 Ophthalmic Axial Length Segmental Measurements Macro | Home | C.8.25.14.4 Ophthalmic Axial Measurements Selected Macro