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Page 1186​

DICOM PS3.3 2020a - Information Object Definitions​

of threshold (sensitivity = 1/threshold) and vice versa. In other disciplines, visual threshold is usually defined by the probability of​ seeing a difference in luminance, brightness, hue or saturation, or a difference in some other attribute exhibited by a given set of​ stimuli. As such, a threshold is usually described in terms of the minimum amount of luminance, contrast, hue or other attribute that​ can be minimally detected. However, many sources that refer to perimetry have described threshold in terms of decibel (dB) values​ rather than attributing the dB measures to sensitivity. It would be advisable to check each individual device to determine how dB is​ defined.​

C.8.26.4.1.3 Blind Spot X and Y Coordinates​

ForBlindSpotX-Coordinate(0024,0107)andBlindSpotY-Coordinate(0024,0108),theconventiondescribedbelowfortheCartesian​ coordinate system specifies that to the right is positive on the x axis and up is positive on the Y axis. Figure C.8.26.4.1-1 illustrates​ how visual fields are displayed in standard format with the temporal visual field from the right eye displayed to the right and the nasal​ visual field from the right eye to the left.​

 

 

Left Eye

 

Right Eye

 

 

+

 

 

+

 

 

 

Nasal

 

Nasal

 

 

 

 

Vision

 

Vision

 

–

Blind

 

 

+

+

 

Blind

Spot

 

 

 

Spot

 

 

 

 

 

 

 

 

–

–

–

Figure C.8.26.4.1-1. Convention of coordinate system used in visual field representation.​

C.8.26.5 Visual Field Static Perimetry Test Results Module​

Table C.8.26.5-1 defines the Attributes used to interpret the test results of a patient's visual field test.​

Table C.8.26.5-1. Visual Field Static Perimetry Test Results Module Attributes​

Attribute Name​

Tag​

Type​

Attribute Description​

Visual Field Mean Sensitivity​

(0024,0070)​

1C​

Average sensitivity of the test pointsof the visual field, in dB.​

 

 

 

Required if Content Item Modifier Sequence (0040,0441)​

 

 

 

within the Performed Protocol Code Sequence (0040,0260)​

 

 

 

contains an Item with the value (261004008, SCT,​

 

 

 

"Diagnostic"). May be present otherwise.​

Visual Field Test Normals Flag​

(0024,0063)​

1​

Whether normals exist for this patient's results.​

 

 

 

Enumerated Values:​

 

 

 

YES​

 

 

 

NO​

Results Normals Sequence​

(0024,0064)​

1C​

Informationthatrepresentsthestatisticallynormalresultsfor​

patients from a referenced data base.​

Only a single Item shall be included in this Sequence.​

Required if Visual Field Test Normals Flag (0024,0063) is​

YES.​

>IncludeTable10-22“Externally-SourcedDataSetIdentificationMacro​ Attributes”​

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DICOM PS3.3 2020a - Information Object Definitions​

Page 1187​

Attribute Name​

Tag​

Type​

Attribute Description​

 

>Global Deviation from Normal​

(0024,0066)​

1​

Weighted average deviation from the age corrected normal​

 

 

 

field, in dB.​

 

>Global Deviation Probability​

(0024,0059)​

1​

Whether normals exist for the global deviation probability.​

Normals Flag​

 

 

Enumerated Values:​

 

 

 

 

 

 

 

 

YES​

 

 

 

 

NO​

 

>Global Deviation Probability​

(0024,0083)​

1C​

Probability value and software algorithm used to provide the​

Sequence​

 

 

normality for the global deviation.​

 

 

 

 

Only a single Item shall be included in this Sequence.​

 

 

 

Required if Global Deviation Probability Normals Flag​

 

 

 

(0024,0059) is YES.​

 

>>Global Deviation Probability​

(0024,0071)​

1​

The percentile of the Global Deviation from Normal​

 

 

 

(0024,0066) value within the normal population, in​

 

 

 

percent.0024​

 

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

 

 

>LocalizedDeviationFromNormal​

(0024,0068)​

1​

Weighted square root of loss variance, in dB.​

 

>Local Deviation Probability​

(0024,0072)​

1​

Whether normals exist for the local deviation probability.​

Normals Flag​

 

 

Enumerated Values:​

 

 

 

 

 

 

 

 

YES​

 

 

 

 

NO​

 

>Localized Deviation Probability​

(0024,0085)​

1C​

Probability value and software algorithm used to provide the​

Sequence​

 

 

normality for the local deviation.​

 

 

 

 

Only a single Item shall be included in this Sequence.​

 

 

 

Required if Local Deviation Probability Normals Flag​

 

 

 

(0024,0072) is YES.​

 

>>Localized Deviation Probability​

(0024,0073)​

1​

The percentile of the Localized Deviation From Normal​

 

 

 

(0024,0068) value within the normal population, in percent.​

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

 

 

ShortTermFluctuationCalculated​

(0024,0074)​

1​

Whether the short term fluctuation was calculated.​

 

 

 

Enumerated Values:​

 

 

 

 

YES​

 

 

 

 

NO​

 

Short Term Fluctuation​

(0024,0075)​

1C​

Averagedeviationofsensitivityfortherepeatedtestlocations,​

 

 

 

in dB. This is used to determine the consistency of the​

 

 

 

patient's responses.​

 

 

 

 

Required if Short Term Fluctuation Calculated (0024,0074)​

 

 

 

is YES.​

 

ShortTermFluctuationProbability​

(0024,0076)​

1​

Whethertheshorttermfluctuationprobabilitywascalculated.​

Calculated​

 

 

Enumerated Values:​

 

 

 

 

 

YES​

NO​

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Page 1188​

DICOM PS3.3 2020a - Information Object Definitions​

Attribute Name​

Tag​

Type​

Attribute Description​

ShortTermFluctuationProbability​

(0024,0077)​

1C​

The percentile of the Short Term Fluctuation (0024,0075)​

 

 

 

value within the normal population, in percent.​

 

 

 

Required if Short Term Fluctuation Probability Calculated​

 

 

 

(0024,0076) is YES.​

Corrected Localized Deviation​

(0024,0078)​

1​

Whether the corrected localized deviation from normal was​

From Normal Calculated​

 

 

calculated.​

 

 

 

Enumerated Values:​

 

 

 

YES​

 

 

 

NO​

Corrected Localized Deviation​

(0024,0079)​

1C​

Weighted square root of loss variance corrected for short​

From Normal​

 

 

term fluctuation, in dB.​

 

 

 

Required if Corrected Localized Deviation From Normal​

 

 

 

Calculated (0024,0078) is YES.​

Corrected Localized Deviation​

(0024,0080)​

1​

Whether the corrected localized deviation from Normal​

From Normal Probability​

 

 

probability was calculated.​

Calculated​

 

 

Enumerated Values:​

 

 

 

 

 

 

YES​

 

 

 

NO​

Corrected Localized Deviation​

(0024,0081)​

1C​

The percentile of the Corrected Localized Deviation From​

From Normal Probability​

 

 

Normal (0024,0079) value within the normal population, in​

 

 

 

percent.​

 

 

 

Required if Corrected Localized Deviation From Normal​

 

 

 

Probability Calculated (0024,0080) is YES.​

Visual Field Global Results Index​

(0024,0320)​

3​

Information about various visual field indexes related to test​

Sequence​

 

 

results.​

One or more Items are permitted in this Sequence.​

>IncludeTableC.8.26.3-2“OphthalmicVisualFieldGlobalIndexMacro​ Attributes”​

C.8.26.6 Ophthalmic Patient Clinical Information and Test Lens Parameters Module​

Table C.8.26.6-1 defines the Attributes used to represent a patient's clinical parameters during an ophthalmic test.​

Table C.8.26.6-1. Ophthalmic Patient Clinical Information and Test Lens Parameters Module Attributes​

Attribute Name​

Tag​

Type​

Attribute Description​

Ophthalmic Patient Clinical​

(0024,0114)​

1C​

Information used to represent a patient's clinical​

Information Left Eye Sequence​

 

 

parameters during an ophthalmic test.​

 

 

 

Only a single Item shall be included in this​

 

 

 

Sequence.​

 

 

 

Required if Measurement Laterality (0024,0113)​

 

 

 

is L or B.​

>Include Table C.8.26.6-2 “Ophthalmic Patient Clinical Information and Test Lens​

Parameters Macro Attributes”​

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DICOM PS3.3 2020a - Information Object Definitions​

Page 1189​

Attribute Name​

Tag​

Type​

 

Attribute Description​

Ophthalmic Patient Clinical​

(0024,0115)​

1C​

Information used to represent a patient's clinical​

Information Right Eye Sequence​

 

 

parameters during an ophthalmic test.​

Only a single Item shall be included in this​

Sequence.​

Required if Measurement Laterality (0024,0113)​ is R or B.​

>Include Table C.8.26.6-2 “Ophthalmic Patient Clinical Information and Test Lens​

Parameters Macro Attributes”​

C.8.26.6.1 Ophthalmic Patient Clinical Information and Test Lens Parameters Macro​

Table C.8.26.6-2 describes the Attributes for the Ophthalmic Patient Clinical and Test Lens Parameters Macro.​

Table C.8.26.6-2. Ophthalmic Patient Clinical Information and Test Lens Parameters Macro Attributes​

Attribute Name​

Tag​

Type​

Attribute Description​

Refractive Parameters Used on​

(0024,0112)​

2​

Refractive parameters used when performing visual​

Patient Sequence​

 

 

field test.​

 

 

 

Zero or one Item shall be included in this Sequence.​

>Spherical Lens Power​

(0022,0007)​

1​

Sphere value in diopters.​

>Cylinder Lens Power​

(0022,0008)​

1​

Cylinder value in diopters.​

>Cylinder Axis​

(0022,0009)​

1​

Axis value in degrees.​

Pupil Size​

(0046,0044)​

2​

The horizontal diameter measurement of the pupil, in​

 

 

 

mm.​

Pupil Dilated​

(0022,000D)​

2​

The patient's pupils were pharmacologically dilated​

 

 

 

for this acquisition.​

 

 

 

Enumerated Values:​

 

 

 

YES​

 

 

 

NO​

 

 

 

If this Attribute is empty, no information is available.​

Intra Ocular Pressure​

(0022,000B)​

3​

Value of intraocular pressure in mmHg.​

Visual Acuity Measurement​

(0024,0110)​

3​

Measurements of a patient's visual acuity.​

Sequence​

 

 

Only a single Item is permitted in this Sequence.​

 

 

 

>Include Table C.8.25.12-2 “Visual Acuity Measurements Macro Attributes”​

C.8.27 Intravascular Optical Coherence Tomography Modules​

C.8.27.1 Intravascular OCT Series Module​

Table C.8.27.1-1 specifies the Attributes that identify and describe general information about the Intravascular Optical Coherence​ Tomography Series.​

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Page 1190​ DICOM PS3.3 2020a - Information Object Definitions​

Table C.8.27.1-1. Intravascular OCT Series Module Attributes​

Attribute Name​

Tag​

Type​

Attribute Description​

Modality​

(0008,0060)​

1​

Typeofequipmentthatoriginallyacquiredthedatausedtocreate​

 

 

 

the images in this Series.​

 

 

 

Enumerated Values:​

 

 

 

IVOCT​

 

 

 

See Section C.7.3.1.1.1 for further explanation.​

Series Number​

(0020,0011)​

1​

A number that identifies this Series.​

Referenced Performed​

(0008,1111)​

1C​

UniquelyidentifiesthePerformedProcedureStepSOPInstance​

Procedure Step Sequence​

 

 

to which the Series is related.​

 

 

 

Only a single Item shall be included in this Sequence.​

 

 

 

RequiredifaPerformedProcedureStepSOPClasswasinvolved​

 

 

 

in the creation of this Series.​

>Referenced SOP Class UID​

(0008,1150)​

1​

Uniquely identifies the referenced SOP Class.​

>Referenced SOP Instance UID​

(0008,1155)​

1​

Uniquely identifies the referenced SOP Instance.​

Presentation Intent Type​

(0008,0068)​

1​

Identifies the intent of the images that are contained within this​

 

 

 

Series.​

Enumerated Values:​

FOR​

PRESENTATION​

FOR PROCESSING​

C.8.27.1.1 Intravascular OCT Series Attribute Descriptions​

C.8.27.1.1.1 Presentation Intent Type​

Presentation Intent Type (0008,0068) identifies the intent for the purposes of display or other presentation of all Images within this​ Series.​

Note​

1.​Since this is a Series level Attribute, all Images within a Series have the same value for this Attribute.​

2.​The intent of this restriction is to ensure that FOR PRESENTATION and FOR PROCESSING images are placed in​ separate Series, so that no confusion can arise as to which images are suitable for diagnostic reading as determined​ by local policy.​

A Series of Images intended for viewing by an observer shall have an Enumerated Value of FOR PRESENTATION. The value shall​ not be set to FOR PRESENTATION unless Z Offset correction, refractive index correction and polar to rectangular conversion have​ been applied​

Images or individual frames of a FOR PRESENTATION image shall reference their associated source FOR PROCESSING frames,​ if any exist, using the Derivation Image Functional Group Macro, with the Derivation Code (113093, DCM, "Polar to Rectangular Scan​ Conversion") and the Purpose of Reference Code (121358, DCM, "For Processing Image").​

Note​

1.​FOR PRESENTATION images are still be of Image Type (0008,0008) and Frame Type (0008,9007) ORIGINAL rather​ than DERIVED despite having undergone processing, such as corrections for Z Offset, Refractive index and Polar to​ Rectangular conversion. In this case a DERIVED image would have undergone yet further processing to make it sub-​ stantially different from the original. See Figure C.8.27-1. The Derivation Image Functional Group Macro may be used​ even if Image Type (0008,0008) and Frame Type (0008,9007) is ORIGINAL.​

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