DICOM PS3.3 2019a - Information Object Definitions

C.8.26.3 Visual Field Static Perimetry Test Reliability Module

Table C.8.26.3-1 defines the Attributes used to represent the test reliability parameters determined during a patient's visual field test.

Table C.8.26.3-1. Visual Field Static Perimetry Test Reliability Module Attributes

Attribute Name

Tag

Type

Attribute Description

Fixation Sequence

(0024,0032)

1

The patient's gaze stability information during the visual field test.

Only a single Item shall be included in this Sequence.

>Fixation Monitoring Code Sequence

(0024,0033)

1

The device strategy used to monitor the patient's fixation.

One or more Items shall be included in this Sequence.

>>Include Table 8.8-1 “Code Sequence Macro Attributes”

DCID 4253 “Visual Field Static Perimetry Fixation Strategy”.

>Fixation Checked Quantity

(0024,0035)

1C

The number of times that the patient's gaze fixation is checked.

Required if Fixation Monitoring Code Sequence (0024,0033) contains an Item with the value (111844, DCM, "Blind Spot Monitoring") or (111845, DCM, "Macular Fixation Testing"). May be present otherwise.

>Patient Not Properly Fixated Quantity

(0024,0036)

1C

The number of times the patient's gaze is not properly fixated.

Required if Fixation Monitoring Code Sequence (0024,0033) contains an Item with the value (111844, DCM, "Blind Spot Monitoring") or (111845, DCM, "Macular Fixation Testing"). May be present otherwise.

>Excessive Fixation Losses Data Flag

(0024,0039)

1

Whether the device was able to determine excessive fixation losses.

Enumerated Values:

YES

NO

>Excessive Fixation Losses

(0024,0040)

1C

The number of fixation losses is outside of implementation-specific limits.

Enumerated Values:

YES

NO

Required if Excessive Fixation Losses Data Flag (0024,0039) is YES.

Visual Field Catch Trial Sequence

(0024,0034)

1

The reliability of the patient's responses to the visual field test.

Only a single Item shall be included in this Sequence.

>Catch Trials Data Flag

(0024,0055)

1

Whether catch trials data were performed.

Enumerated Values:

YES

NO

>Negative Catch Trials Quantity

(0024,0048)

1C

Total number of times the patient's visual attention was tested using stimuli brighter than previously seen luminance (negative catch trials).

Required if Catch Trials Data Flag (0024,0055) is YES.

>False Negatives Quantity

(0024,0050)

1C

Total number of stimuli that were not seen by the patient but were previously seen at a lower luminance earlier in the visual field test (false negatives).

Required if Catch Trials Data Flag (0024,0055) is YES.

>False Negatives Estimate Flag

(0024,0045)

1

Whether the device was able to estimates false negatives.

Enumerated Values:

YES

NO

>False Negatives Estimate

(0024,0046)

1C

Estimated percentage of all stimuli that were not seen by the patient but were previously seen at a lower luminance earlier in the visual field test (false negative responses), as percent.

Required if False Negatives Estimate Flag (0024,0045) is YES.

>Excessive False Negatives Data Flag

(0024,0051)

1

Whether the device was able to determine excessive false negatives.

Enumerated Values:

YES

NO

>Excessive False Negatives

(0024,0052)

1C

The false negative estimate is outside of implementation-specific limits.

Enumerated Values:

YES

NO

Required if Excessive False Negatives Data Flag (0024,0051) is YES.

>Positive Catch Trials Quantity

(0024,0056)

1C

The total number of times the device behaved as if it was going to present a visual stimulus but did not actually present the stimulus (positive catch trials).

Required if Catch Trials Data Flag (0024,0055) is YES.

>False Positives Quantity

(0024,0060)

1C

The total number of patient responses that occurred at a time when no visual stimulus was present (false positive responses).

Required if Catch Trials Data Flag (0024,0055) is YES.

>False Positives Estimate Flag

(0024,0053)

1

Whether the device was able to estimate false positives.

Enumerated Values:

YES

NO

>False Positives Estimate

(0024,0054)

1C

Estimated percentage of all patient responses that occurred at a time when no visual stimulus was present (false positive responses), as percent.

Required if False Positives Estimate Flag (0024,0053) is YES.

>Excessive False Positives Data Flag

(0024,0061)

1

Whether the device was able to determine excessive false positives.

Enumerated Values:

YES

NO

>Excessive False Positives

(0024,0062)

1C

The false positive estimate is outside of implementation-specific limit.

Enumerated Values:

YES

NO

Required if Excessive False Positives Data Flag (0024,0061) is YES.

Stimuli Retesting Quantity

(0024,0042)

3

Total number of times in the course of a visual field exam that any location had to be retested at the same magnitude.

Note

An example is that the patient received 20 stimuli and blinked twice, therefore need to present the stimuli two additional times in which case the value is 2.

Patient Reliability Indicator

(0024,0069)

3

Vendor implementation specific text to provide an analysis and/or summary of patient reliability indicator/indices.

Comments on Patient's Performance of Visual Field

(0024,0044)

3

Operator's (test administrator) subjective comment on patient's performance.

Visual Field Test Reliability Global Index Sequence

(0024,0317)

3

Information about various visual field indices related to test reliability.

One or more Items are permitted in this Sequence.

>Include Table C.8.26.3-2 “Ophthalmic Visual Field Global Index Macro Attributes”


C.8.26.3.1 Ophthalmic Visual Field Global Index Macro

Table C.8.26.3-2 describes the Attributes for the Ophthalmic Visual Field Global Index Macro.

Table C.8.26.3-2. Ophthalmic Visual Field Global Index Macro Attributes

Attribute Name

Tag

Type

Attribute Description

Data Observation Sequence

(0024,0325)

1

Information about various visual field global indexes.

Only a single Item shall be included in this Sequence.

>Include Table 10-2 “Content Item Macro Attributes Description”

Value Type (0040,A040) shall be NUMERIC or CODE.

Concept Name Code Sequence (0040,A043) shall use CID 4257 “Visual Field Global Index Name”.

Concept Code Sequence (0040,A168) shall use CID 4254 “Visual Field Static Perimetry Test Analysis Results”.

Index Normals Flag

(0024,0338)

1

Whether normative data exists for this index.

Enumerated Values:

YES

NO

Index Probability Sequence

(0024,0344)

1C

Probability value and software algorithm used to provide the index.

Only a single Item shall be included in this Sequence.

Required if Index Normals Flag (0024,0338) is YES.

>Index Probability

(0024,0341)

1

Probability for the index value within the normal population, in percent.

>Include Table 10-19 “Algorithm Identification Macro Attributes”


DICOM PS3.3 2019a - Information Object Definitions