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DICOM PS3.3 2020a - Information Object Definitions​

Page 1201​

C.8.28.2 Ophthalmic Thickness Map Module​

Table C.8.28.2-1 specifies the Attributes that describe an Image produced by ophthalmic thickness mapping devices.​

Table C.8.28.2-1. Ophthalmic Thickness Map Module Attributes​

Attribute Name​

Tag​

Type​

 

Attribute Description​

Ophthalmic Mapping​

(0022,1415)​

1​

Describes the type of ophthalmic mapping acquisition device. See​

Device Type​

 

 

Section C.8.28.2.1.3 for further explanation.​

 

 

 

Defined Terms​

 

 

 

 

OCT​

Optical coherence tomography​

 

 

 

POLARIMETRY​Scanning laser polarimetry​

 

 

 

SLO_TOMO​ Scanning Laser Ophthalmoscopy Tomography​

Acquisition Method Code​

(0022,1420)​

1​

The acquisition method used for obtaining ophthalmic thickness​

Sequence​

 

 

mapping.​

 

 

 

 

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

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

DCID 4261 “Ophthalmic Mapping Acquisition Method”​

Acquisition Method​

(0022,1423)​

1C​

Software algorithm used to provide acquisition method.​

Algorithm Sequence​

 

 

RequiredifAcquisitionMethodCodeSequence(0022,1420)contains​

 

 

 

 

 

 

an Item with the value of (111923, DCM, "Corneal birefringence​

 

 

 

compensation")​

 

 

 

May be present otherwise.​

 

 

 

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

>IncludeTable10-19“AlgorithmIdentificationMacroAttributes”​

 

Instance Number​

(0020,0013)​

1​

A number that identifies this instance.​

Content Date​

(0008,0023)​

1​

The date the data creation was started.​

Content Time​

(0008,0033)​

1​

The time the data creation was started.​

Acquisition DateTime​

(0008,002A)​

1​

The date and time that the acquisition of data that resulted in this​

 

 

 

image started.​

 

 

 

 

Note​

 

 

 

 

The synchronization of this time with an external clock is​

 

 

 

specified in the Synchronization Module in Acquisition Time​

 

 

 

Synchronized (0018,1800).​

Image Type​

(0008,0008)​

1​

Image identification characteristics.​

 

 

 

See Section C.8.28.2.1.1 for specialization.​

Samples Per Pixel​

(0028,0002)​

1​

Number of samples (planes) in this image.​

 

 

 

See Section C.7.6.3.1.1 for further explanation.​

Enumerated Values:​

1​

- Standard -​

Page 1202​

DICOM PS3.3 2020a - Information Object Definitions​

Attribute Name​

Tag​

Type​

Attribute Description​

Photometric Interpretation​

(0028,0004)​

1​

Specified the intended interpretation of the pixel data.​

 

 

 

See Section C.7.6.3.1.2 for further explanation.​

 

 

 

Enumerated Values:​

 

 

 

MONOCHROME2​

Pixel Representation​

(0028,0103)​

1​

Data representation of pixel samples.​

 

 

 

Enumerated Values:​

 

 

 

0000H​unsigned integer​

Pixel Spacing​

(0028,0030)​

1​

Physical distance in the patient between the center of each pixel,​

 

 

 

specifiedbyanumericpair-adjacentrowspacing(delimiter)adjacent​

 

 

 

column spacing in mm.​

 

 

 

Note​

 

 

 

Since a patient's retina is curved, there can be a small error​

 

 

 

in using Pixel Spacing (0028,0030) for distance​

 

 

 

measurements in the periphery of the image.​

 

 

 

See Section 10.7.1.3 for further explanation.​

Pixel Aspect Ratio​

(0028,0034)​

1​

Ratio of the vertical size and horizontal size of the pixels in the image​

 

 

 

specifiedbyapairofintegervalueswherethefirstvalueisthevertical​

 

 

 

pixel size, and the second value is the horizontal pixel size.​

Bits Allocated​

(0028,0100)​

1​

Number of bits allocated for each pixel sample. Each sample shall​

 

 

 

have the same number of bits allocated.​

 

 

 

See PS3.5 for further explanation.​

 

 

 

Enumerated Values:​

 

 

 

8​

 

 

 

16​

Bits Stored​

(0028,0101)​

1​

Number of bits stored for each pixel sample. Shall be equal to Bits​

 

 

 

Allocated (0028,0100).​

High Bit​

(0028,0102)​

1​

Most significant bit for pixel sample data. Each sample shall have the​

 

 

 

samehighbit.HighBit(0028,0102)shallbeonelessthanBitsStored​

 

 

 

(0028,0101).​

Pixel Presentation​

(0008,9205)​

1​

The source of the color information for use during rendering.​

 

Enumerated Values:​

 

COLOR​ UseSupplementalPaletteColorLookupTableModule​

 

Attributes​

 

COLOR_REF​Use Referenced Color Palette Instance UID​

 

(0028,0304)​

Referenced Color Palette​ (0028,0304)​

1C​ The identifier of the color palette (i.e., an instance oftheColor Palette​

Instance UID​

Storage SOP Class "1.2.840.10008.5.1.4.39.1") for use during​

 

rendering.​

 

Required if Pixel Presentation (0008,9205) is COLOR_REF.​

- Standard -​

 

DICOM PS3.3 2020a - Information Object Definitions​

Page 1203​

Attribute Name​

Tag​

Type​

Attribute Description​

 

Lossy Image Compression​

(0028,2110)​

1​

Specifies whether an Image has undergone lossy compression (at a​

 

 

 

point in its lifetime).​

 

 

 

 

Enumerated Values:​

 

 

 

 

00​Image has NOT been subjected to lossy compression.​

 

 

 

01​Image has been subjected to lossy compression.​

 

 

 

 

Once this value has been set to 01 it shall not be reset.​

 

 

 

 

See Section C.7.6.1.1.5.​

 

Lossy Image Compression​

(0028,2112)​

1C​

Describestheapproximatelossycompressionratio(s)thathavebeen​

Ratio​

 

 

applied to this image.​

 

 

 

 

See Section C.7.6.1.1.5.2.​

 

 

 

 

Required if Lossy Image Compression (0028,2110) is "01".​

Lossy Image Compression​

(0028,2114)​

1C​

A label for the lossy compression method(s) that have been applied​

Method​

 

 

to this image.​

 

 

 

 

See Section C.7.6.1.1.5.1.​

 

 

 

 

Required if Lossy Image Compression (0028,2110) is "01".​

Burned In Annotation​

(0028,0301)​

1​

Indicates that the image does not contain burned in annotation to​

 

 

 

identify the patient and date the image was acquired.​

 

 

 

 

Enumerated Values:​

 

 

 

 

NO​

 

Recognizable Visual​

(0028,0302)​

1​

Indicates whether or not the image contains sufficiently recognizable​

Features​

 

 

visual features to allow the image or a reconstruction from a set of​

 

 

 

images to identify the patient.​

 

 

 

 

Enumerated Values:​

 

 

 

 

NO​

 

Image Laterality​

(0020,0062)​

1​

Laterality of object imaged (as described in Anatomic Region​

 

 

 

Sequence (0008,2218)) examined.​

 

Enumerated Values:​

R​right eye​

L​left eye​

Note​

This Attribute is mandatory, in order to ensure that images​ may be positioned correctly relative to one another for​ display.​

ShallbeconsistentwithanylateralityinformationcontainedinPrimary​

Anatomic Structure Modifier Sequence (0008,2230), if present.​

Note​

Laterality (0020,0060) is a Series level Attribute and must​ be the same for all Images in the Series, hence it must be​ absent.​

- Standard -​

Page 1204​

DICOM PS3.3 2020a - Information Object Definitions​

Attribute Name​

Tag​

Type​

Attribute Description​

OphthalmicThicknessMap​

(0022,1436)​

1​

The type of ophthalmic thickness map encoded in this SOP Instance.​

Type Code Sequence​

 

 

It specifies the meaning of the pixel values.​

 

 

 

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

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

DCID 4263 “Ophthalmic Thickness Map Value Type”​

Include Table C.7.6.16-12 “Real World Value Mapping Macro​Include if Ophthalmic Thickness Map Type Code Sequence​ Attributes”​ (0022,1436)containsanItemwiththevalue(111930,DCM,"Absolute​

ophthalmic thickness") or (111932, DCM, "Thickness deviation from​ normative data").​

 

 

 

May be present otherwise.​

 

 

 

Defined CID for Measurement Units Code Sequence is 4260​

Pixel Value Mapping to​

(0022,1450)​

1C​

Provides a pixel value and the mapping of that pixel value to an​

Coded Concept Sequence​

 

 

associated Coded Concept.​

 

 

 

Required if Ophthalmic Thickness Map Type Code Sequence​

 

 

 

(0022,1436) contains an Item with the value (111931, DCM,​

 

 

 

"Thickness deviation category from normative data").​

 

 

 

May be present otherwise.​

 

 

 

One or more Items shall be present.​

>Mapped Pixel Value​

(0022,1452)​

1​

Pixel value to be mapped.​

>PixelValueMappingCode​

(0040,9098)​

1​

The mapping from Mapped Pixel Value (0022,1452) to an associated​

Sequence​

 

 

Coded Concept.​

 

 

 

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

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

DCID 4265 “Ophthalmic Thickness Deviation Categories”.​

>Pixel Value Mapping​

(0022,1454)​

3​

Free form text explanation of the Coded Concept.​

Explanation​

 

 

 

Ophthalmic Thickness​

(0022,1443)​

1C​

Identifies the Externally Sourced Data Set used for mapping values​

Mapping Normals​

 

 

from a normative data base.​

Sequence​

 

 

Required if Ophthalmic Thickness Map Type Code Sequence​

 

 

 

 

 

 

(0022,1436) contains an Item with the value or (111931, DCM,​

 

 

 

"Thickness deviation category from normative data") or (111932,​

 

 

 

DCM, "Thickness deviation from normative data"). May be present​

 

 

 

otherwise.​

 

 

 

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

>Include Table 10-22 “Externally-Sourced Data Set​

 

 

Identification Macro Attributes”​

 

 

Relevant OPT Attributes​

(0022,1472)​

1C​

Attributes from the OPT image that provide critical context for the​

Sequence​

 

 

interpretation of this ophthalmic map SOP Instance. Required if​

 

 

 

Ophthalmic Mapping Device Type (0022,1415) is OCT.​

 

 

 

Only a single Item shall be included in this Sequence​

>Depth Spatial Resolution​

(0022,0035)​

1​

The inherent limiting resolution in microns for depth of the acquisition​

 

 

 

equipment for high contrast objects for the data gathering and​

 

 

 

reconstruction technique chosen. If variable, the value at the center​

 

 

 

of the scanning volume.​

>MaximumDepthDistortion​

(0022,0036)​

1​

Maximumdistortionindepthdirectionin%ofDepthSpatialResolution.​

- Standard -​

 

DICOM PS3.3 2020a - Information Object Definitions​

Page 1205​

Attribute Name​

Tag​

Type​

Attribute Description​

 

Source Image Sequence​

(0008,2112)​

1C​

The Image SOP Class/Instance pair of the Image that was used to​

 

 

 

generate this Image.​

 

 

 

 

Required if Ophthalmic Mapping Device Type (0022,1415) is OCT.​

 

 

 

May be present otherwise.​

 

 

 

 

Only a single Item shall be included in this Sequence​

 

>Include Table 10-3 “Image SOP Instance Reference Macro​

 

Attributes”​

 

 

 

 

>Purpose of Reference​

(0040,A170)​

1​

Describes the purpose for which the reference is made, (i.e., the role​

Code Sequence​

 

 

the source image or frame(s) played in the generation of this image).​

 

 

 

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

 

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

DCID 7202 “Source Image Purposes of Reference”.​

 

Referenced Instance​

(0008,114A)​

1C​

A Sequence that provides reference to a set of SOP Class/Instance​

Sequence​

 

 

pairs identifying images or other composite SOP Instances to plan​

 

 

 

the acquisition or significant related information.​

 

 

 

 

RequiredifOphthalmicPhotographyReferenceImageavailable.May​

 

 

 

be present otherwise.​

 

 

 

 

See Section C.7.6.16.2.5.1 for further explanation.​

 

 

 

 

Zero or more Items may be included in this Sequence.​

 

>Include Table 10-11 “SOP Instance Reference Macro​

 

 

Attributes”​

 

 

 

 

>Purpose of Reference​

(0040,A170)​

1​

Code describing the purpose of the reference to the Instance(s).​

Code Sequence​

 

 

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

 

 

 

 

 

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

DCID 4264 “Ophthalmic Map Purposes of Reference”.​

 

Registration to Localizer​

(0022,1465)​

3​

RegistrationofcurrentinstancetoalocalizerSOPInstancereferenced​

Sequence​

 

 

in Attribute Referenced Instance Sequence (0008,114A).​

 

 

 

See Section C.8.28.2.1.2 for an example.​

 

>RegisteredLocalizerUnits​

(0022,1466)​

1​

Units of measure for the axes of the registered localizer image.​

 

 

 

Enumerated Values:​

 

 

 

 

PIXEL​See Bounding Box Annotation Units (0070,0003) for​

 

 

 

definition.​

 

>Registered Localizer Top​

(0022,1467)​

1​

LocationoftheTopLeftHandCorner(TLHC)oftheregisteredlocalizer​

Left Hand Corner​

 

 

in Registered Localizer Units (0022,1466), given as column\row.​

 

 

 

Column is the horizontal offset and row is the vertical offset.​

>Registered Localizer​

(0022,1468)​

1​

Location of the Bottom Right Hand Corner (BRHC) of the registered​

Bottom Right Hand Corner​

 

 

localizer in which Registered Localizer Units (0022,1466), given as​

 

 

 

column\row. Column is the horizontal offset and row is the vertical​

 

 

 

offset.​

 

- Standard -​

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