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.

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”

DCID 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)

3

The ratio of signal power to the background noise power (P_signal / P_noise).

>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”

DCID 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.