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DICOM PS3.3 2020a - Information Object Definitions​

Page 1011​

Attribute Name​

Tag​

Type​

Attribute Description​

 

Planar Configuration​

(0028,0006)​

1C​

Indicates whether the pixel data are encoded color-by-plane or​

 

 

 

color-by-pixel.​

 

 

 

 

Required if Samples per Pixel (0028,0002) has a value greater than 1.​

 

 

 

Enumerated Values:​

 

 

 

 

0​color-by-pixel​

 

Pixel Spacing​

(0028,0030)​

1C​

Nominal physical distance at the focal plane (in the retina) between the​

 

 

 

center of each pixel, specified by a numeric pair - adjacent row spacing​

 

 

 

(delimiter) adjacent column spacing in mm. See Section 10.7.1.3 for​

 

 

 

further explanation of the value order.​

 

 

 

 

Note​

 

 

 

 

These values are specified as nominal because the physical​

 

 

 

distance may vary across the field of the images and the lens​

 

 

 

correction is likely to be imperfect.​

 

 

 

 

Shall not be present when Two Dimensional to Three Dimensional Map​

 

 

 

Sequence (0022,1518) or X Coordinates Center Pixel View Angle​

 

 

 

(0022,1528) and Y Coordinates Center Pixel View Angle (0022,1529)​

 

 

 

are present. Otherwise, required when Acquisition Device Type Code​

 

 

 

Sequence (0022,0015) contains an Item with the value (409898007,​

 

 

 

SCT, "Fundus Camera"). May be present otherwise.​

 

Content Time​

(0008,0033)​

1​

The time the image pixel data creation started.​

 

Content Date​

(0008,0023)​

1​

The date the image pixel data creation started.​

 

Acquisition DateTime​

(0008,002A)​

1C​

The date and time that the acquisition of data started.​

 

 

 

 

Note​

 

 

 

 

The synchronization of this time with an external clock is​

 

 

 

specified in the synchronization Module in Acquisition Time​

 

 

 

Synchronized (0018,1800).​

 

 

 

 

Required if Image Type (0008,0008) Value 1 is ORIGINAL. May be​

 

 

 

present otherwise.​

 

Source Image Sequence​

(0008,2112)​

2C​

A Sequence that identifies the Images that were used to derive this​

 

 

 

Image.​

 

 

 

 

Required if Image Type Value 1 is DERIVED.​

 

 

 

 

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

 

 

 

 

See Section C.12.4.1.2 for further explanation.​

 

>IncludeTable10-3“ImageSOPInstanceReferenceMacro​

 

Attributes”​

 

 

 

 

>Purpose of Reference​

(0040,A170)​

1​

Describes the purpose for which the reference is made, that is what role​

Code Sequence​

 

 

the source image or frame(s) played in the derivation 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”.​

- Standard -​

Page 1012​

DICOM PS3.3 2020a - Information Object Definitions​

Attribute Name​

Tag​

Type​

Attribute Description​

LossyImageCompression​

(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.​

LossyImageCompression​

(0028,2112)​

1C​

Describes the approximate lossy compression ratio(s) that have been​

Ratio​

 

 

applied to this image.​

 

 

 

See Section C.7.6.1.1.5.2.​

 

 

 

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

LossyImageCompression​

(0028,2114)​

1C​

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

Method​

 

 

this image.​

 

 

 

See Section C.7.6.1.1.5.1.​

 

 

 

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

Presentation LUT Shape​

(2050,0020)​

1C​

Specifies an identity transformation for the Presentation LUT, such that​

 

 

 

the output of all grayscale transformations defined in the IOD containing​

 

 

 

this Module are defined to be P-Values.​

 

 

 

Enumerated Values:​

 

 

 

IDENTITY​ output is in P-Values.​

 

 

 

Required if Photometric Interpretation (0028,0004) is MONOCHROME2​

Calibration Image​

(0050,0004)​

3​

Indicates whether a reference object (phantom) of known size is present​

 

 

 

in the image and was used for calibration.​

 

 

 

Enumerated Values:​

 

 

 

YES​

 

 

 

NO​

Burned In Annotation​

(0028,0301)​

1​

Indicates whether or not image contains sufficient burned in annotation​

 

 

 

to identify the patient and date the image was acquired.​

 

 

 

Enumerated Values:​

 

 

 

YES​

 

 

 

NO​

Recognizable Visual​

(0028,0302)​

3​

Indicates whether or not the image contains sufficiently recognizable​

Features​

 

 

visualfeaturestoallowtheimageorareconstructionfromasetofimages​

 

 

 

to identify the patient.​

Enumerated Values:​

YES​

NO​

If this Attribute is absent, then the image may or may not contain​ recognizable visual features.​

- Standard -​

DICOM PS3.3 2020a - Information Object Definitions​

Page 1013​

C.8.17.2.1 Ophthalmic Photography Image Module Attribute Descriptions​

C.8.17.2.1.1 Referenced Image Sequence​

The Referenced Image Sequence (0008,1140) in the General Image Module (Section C.7.6.1) shall not convey stereoscopic inform-​ ation, which instead shall be encoded using the Stereometric Relationship IOD.​

C.8.17.2.1.2 Samples Per Pixel and Samples Per Pixel Used​

Samples per Pixel (0028,0002) shall be 1 or 3.​

Cameras producing 2-color images are required to use a value of 3 for Samples per Pixel (0028,0002) and a value of 2 for Samples​ per Pixel Used (0028,0003). For 2-color images with a RGB Photometric Interpretation, the R and G channel shall be used and the​ B channel shall have all values set to zero.​

Note​

In the case of Photometric Interpretations typically used for compression such as YBR_FULL_422, the encoding will be as​ if the RGB values were transformed to YCbCr.​

C.8.17.2.1.3 Photometric Interpretation​

Specifies the intended interpretation of the pixel data.​

Enumerated Values:​

MONOCHROME2​

RGB​

YBR_FULL_422​

YBR_PARTIAL_420​

YBR_ICT​

YBR_RCT​

When Samples per Pixel (0028,0002) is greater than 1, Photometric Interpretation (0028,0004) shall be RGB for uncompressed or​ lossless compressed Transfer Syntaxes that do not have defined color space transformations, YBR_ICT for irreversible JPEG 2000​ Transfer Syntaxes, YBR_RCT for reversible JPEG 2000 Transfer Syntaxes, YBR_PARTIAL_420 for MPEG2, MPEG-4 AVC/H.264​ and HEVC/H.265 Transfer Syntaxes and YBR_FULL_422 for JPEG lossy compressed Transfer Syntaxes.​

C.8.17.2.1.4 Image Type​

TheImageType(0008,0008)Attribute(GeneralImageModule,SectionC.7.6.1)identifiesimportantimagecharacteristicsinamultiple​ valuedDataElement.FortheOphthalmicPhotographyImageIOD,ImageTypeisspecifiedasaType1Attributeandfurtherspecialized​ as follows:​

•​Value 1 shall identify the Pixel Data Characteristics in accordance with Section C.7.6.1.1.2.​

Enumerated Values for Value 1:​

ORIGINAL​

DERIVED​

•​Value 2 shall identify the Patient Examination Characteristics in accordance with Section C.7.6.1.1.2.​

Enumerated Values for Value 2:​

PRIMARY​

•​Value 3 shall only be present if Value 1 is DERIVED.​

Defined Terms for Value 3:​

MONTAGE​

•​Value 4 (optionally present) shall identify the type of test performed for image acquisition.​

- Standard -​

Page 1014​ DICOM PS3.3 2020a - Information Object Definitions​

Defined Terms for Value 4:​

COLOR​ a picture take at "white" light; no filters applied​

REDFREE​a picture take at "green" illumination light; or just the green channel of a color sensor​ RED​ a picture take at "red" illumination light; or just the red channel of a color sensor​ BLUE​ a picture take at "blue" illumination light; or just the blue channel of a color sensor​

FA​ fluorescein injected; a picture taken at fluorescein exciting illumination light; a filter passing just the emitted wavelength​ to sensor applied​

ICG​ Indocyanine green injected; a picture taken at Indocyanine green exciting illumination light; a filter passing just the​ emitted wavelength to sensor applied​

Note​

A Montage Image is constructed out of several individual images, which also can be exchanged separately. The images​ used to create the montage image will be included in the Source Image Sequence (0008,2112) if those images are also​ exchanged. A Montage Image is identified as Image Type DERIVED\PRIMARY\MONTAGE​

C.8.17.3 Ophthalmic Photographic Parameters Module​

This Module describes equipment used to create original images.​

Table C.8.17.3-1. Ophthalmic Photographic Parameters Module Attributes​

Attribute Name​

Tag​

Type​

Attribute Description​

AcquisitionDeviceTypeCode​

(0022,0015)​

1​

Describes the type of acquisition device​

Sequence​

 

 

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

 

 

 

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

BCID 4202 “Ophthalmic Photography Acquisition Device”.​

Illumination Type Code​

(0022,0016)​

2​

Coded value for illumination​

Sequence​

 

 

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

 

 

 

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

BCID 4203 “Ophthalmic Photography Illumination”.​

Light Path Filter Type Stack​

(0022,0017)​

2​

Filters used in the light source path​

Code Sequence​

 

 

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

 

 

 

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

BCID 4204 “Ophthalmic Filter”.​

LightPathFilterPass-Through​

(0022,0001)​

3​

Nominal pass-through wavelength of light path filter in nm​

Wavelength​

 

 

 

Light Path Filter Pass Band​

(0022,0002)​

3​

Pass band of light path filter in nm. This Attribute has two​

 

 

 

Values. The first is the shorter and the second the longer​

 

 

 

wavelength relative to the peak. The values are for the - 3dB​

 

 

 

nominal (1/2 of peak) pass through intensity​

 

 

 

One of the two Values may be zero length, in which case it is​

 

 

 

a cutoff filter.​

Image Path Filter Type Stack​

(0022,0018)​

2​

Describes stack of filters used in image path​

Code Sequence​

 

 

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

 

 

 

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

BCID 4204 “Ophthalmic Filter”.​

Image Path Filter​

(0022,0003)​

3​

Nominal pass-through wavelength of image path filter in nm​

Pass-Through Wavelength​

 

 

 

- Standard -​

 

DICOM PS3.3 2020a - Information Object Definitions​

Page 1015​

Attribute Name​

Tag​

Type​

Attribute Description​

 

Image Path Filter Pass Band​

(0022,0004)​

3​

Pass band of image path filter in nm. This Attribute has two​

 

 

 

Values. The first is the shorter and the second the longer​

 

 

 

wavelength relative to the peak. The values are for the - 3dB​

 

 

 

nominal (1/2 of peak) pass through intensity​

 

 

 

 

One of the two Values may be zero length, in which case it is​

 

 

 

a cutoff filter​

 

Lenses Code Sequence​

(0022,0019)​

2​

Lenses that were used during the image acquisition​

 

 

 

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

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

BCID 4205 “Ophthalmic Lens”.​

 

Detector Type​

(0018,7004)​

2​

Type of detector used for creating this image.​

 

 

 

 

Defined Terms:​

 

 

 

 

CCD​ Charge Coupled Devices​

 

 

 

 

CMOS​Complementary Metal Oxide Semiconductor​

Channel Description Code​

(0022,001A)​

1C​

Describes the light color used for each channel to generate the​

Sequence​

 

 

image. Required if this differs from the natural interpretation.​

 

 

 

Note​

 

 

 

 

Interpretation and representation of RGB images rely​

 

 

 

ontheassumptionthattheredchannelreallycontains​

 

 

 

theredwavelengthrangeofilluminationlight,theblue​

 

 

 

channel the blue wavelength range, etc. Some​

 

 

 

modalities use the RGB Photometric Interpretation as​

 

 

 

acontainerrepresenting3channelsofanyillumination​

 

 

 

wavelength.​

 

 

 

 

Shall have the same number of Items as the Value of Samples​

 

 

 

per Pixel Used (0028,0003) if present, or otherwise the value​

 

 

 

of Samples per Pixel (0028,0002). The channels shall be​

 

 

 

described in the order in which the channels are encoded.​

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

BCID 4206 “Ophthalmic Channel Description”.​

 

Camera Angle of View​

(0022,001E)​

3​

The aperture angle of the camera, in degrees​

 

C.8.17.4 Ophthalmic Photography Acquisition Parameters Module​

This Module describes patient clinical conditions related to the image acquisition.​

Table C.8.17.4-1. Ophthalmic Photography Acquisition Parameters Module Attributes​

Attribute Name​

Tag​

Type​

Attribute Description​

Patient Eye Movement​

(0022,0005)​

2​

Enumerated Values:​

Commanded​

 

 

YES​

 

 

 

 

 

 

NO​

PatientEyeMovementCommand​

(0022,0006)​

1C​

Coded value for patient movement or orientation,​

Code Sequence​

 

 

which is the intent, and not necessarily the result,​

 

 

 

based on what the patient is capable of.​

Required if the value of Patient Eye Movement​

Commanded (0022,0005) is YES.​

OnlyasingleItemshallbeincludedinthisSequence.​

- Standard -​

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