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Page 1036​

DICOM PS3.3 2020a - Information Object Definitions​

Note​

Image workstations receiving ophthalmic tomography images may choose to evaluate the structural ophthalmic tomography​ image and generate a different set of segmented surfaces than defined by an acquisition device. The surface segmentation​ information can be stored in a separate Surface Segmentation SOP Instance.​

The Ophthalmic Tomography Image, Surface Segmentation, Ophthalmic Optical Coherence Tomography B-scan Volume Analysis​ and the Ophthalmic Optical Coherence Tomography En Face Image SOP Instances all reside in different DICOM Series. They share​ the same spatial Frame of Reference which is identified in Attribute Frame of Reference UID (0020,0052) (i.e., the value of Frame of​ Reference UID (0020,0052) is the same in each SOP Instance). Figure C.8.17.14-2 illustrates the relationships between the OCT​ angiography based SOP Instances.​

Same Frame of Reference UID

 

Opth OCT Enface Image

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

SOP Instance

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

References Referenced Surface Mesh 1-n

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Surface Segmentation

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Identification Sequence

 

 

 

SOP Instance

 

 

0-n

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

References Segment Surface Source

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1-n

 

 

 

 

Instance Sequence

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

References Source Image Sequence

 

 

 

 

 

 

 

 

 

Structural OPT Image

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

SOP Instance

 

 

 

 

 

 

 

 

References Source Image Sequence

 

0-n

 

Opth OCT B-Scan Volume

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Analysis SOP Instance

 

 

 

 

 

 

 

0-n

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

References Source Image Sequence

 

 

Raw Data

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1-n

 

 

 

in the Derived Image Sequence

0-n

 

SOP Instance

 

 

 

 

 

 

 

 

 

 

 

 

References Source Image Sequence

 

 

 

References Referenced Image

 

 

 

 

 

 

 

 

 

 

 

 

 

 

in the Derived Image Sequence

0-1

 

 

 

Sequence

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Legend:

 

 

 

 

References Referenced Image

 

 

 

 

 

 

 

OP Image

 

 

 

 

Sequence

 

 

 

 

 

 

 

 

SOP Instance

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Stage 1 Data Stage 2 Data Stage 3 Data

Figure C.8.17.14-2. Relationships Between OCT-A Based SOP Instances​

C.8.17.14.1.2 Referenced Surface Mesh Identification Sequence​

Referenced Surface Mesh Identification Sequence (0022,1620) identifies one or more segmentation surfaces used to generate the​ derived en face image. The segmented surfaces are described in the SOP Instance identified by Referenced SOP Instance UID​ (0008,1155) (e.g., Surface Segmentation Storage SOP Instance).​

C.8.17.14.1.3 Ophthalmic Image Type Code Sequence​

Implementations may generate many different types of derived en face images. Figure C.8.17.14-3 illustrates various derived enface​ image types. The Ophthalmic Image Type Code Sequence (0022,1615) is used to identify the type of derived en face image.​

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DICOM PS3.3 2020a - Information Object Definitions​

Page 1037​

Retina depth encoded

Vitreous

Superficial retina

Deep retina

vasculature flow

vasculature flow

vasculature flow

vasculature flow

Outer retina

Choriocapillaris

Choroid

Whole eye

vasculature flow

vasculature flow

vasculature flow

vasculature flow

Figure C.8.17.14-3. Examples of En Face Images Types​

C.8.17.14.1.4 Photometric Interpretation​

Specifies the intended interpretation of the pixel data.​

Enumerated Values:​

MONOCHROME2​

PALETTE​

COLOR​

C.8.17.14.1.5 Image Type​

TheImageType(0008,0008)Attribute(GeneralImageModule,SectionC.7.6.1)identifiesimportantimagecharacteristicsinamultiple​ valued Data Element. For the Ophthalmic Optical Tomography En Face Image IOD, Image Type is specified as a Type 1 Attribute​ and further specialized 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:​

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 identify any Image IOD specific specialization in accordance with Section C.7.6.1.1.2 (optional).​

Defined Terms for Value 3:​

MONTAGE​identifies a Montage Image​

•​Other Values that are implementation specific in accordance with Section C.7.6.1.1.2 (optional)​

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.​

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Page 1038​

DICOM PS3.3 2020a - Information Object Definitions​

C.8.17.14.1.6 Bits Allocated, Bits Stored, and High Bit​

These Attributes shall be determined based upon the Photometric Interpretation (0028,0004):​

Photometric Interpretation​

Bits Allocated (0028,0100)​

Bits Stored (0028,0101)​

High Bit (0028,0102)​

(0028,0004)​

 

 

 

MONOCHROME2​

8​

8​

7​

PALETTE COLOR​

16​

12​

11​

16​

16​

15​

 

C.8.17.14.1.7RelationshipBetweenOphthalmicTomographyImageandOphthalmicOpticalCoherenceTomographyB-scan​

Volume Analysis IODs​

When generating an angiographic en face Image SOP Instance implementations need to understand the relationship between the​ Ophthalmic Tomography Image SOP Instance(s) and the Ophthalmic Optical Coherence Tomography B-scan Volume Analysis SOP​ Instance.​

The Ophthalmic Optical Coherence Tomography B-scan Volume Analysis SOP Instance, which is a multi-frame SOP Instance, refer-​ ences one or more Ophthalmic Tomography Image SOP Instances using the Derivation Image Macro. The Derivation Image Macro​ defines Attributes at the Frame Level (i.e. each frame in the Ophthalmic Optical Coherence Tomography B-scan Volume Analysis​ SOP Instance, references an Ophthalmic Tomography Image SOP Instance and the Ophthalmic Tomography Image SOP Instance​ frame number that was used to generate the specific Ophthalmic Optical Coherence Tomography B-scan Volume Analysis frame).​

Examples are shown in Section UUU.2 “Relationship Between Ophthalmic Tomography Image and Ophthalmic Optical Coherence​ Tomography B-scan Volume Analysis IODs” in PS3.17.​

C.8.17.15 Ophthalmic Optical Coherence Tomography En Face Image Quality Rating​

Module​

Table C.8.17.15-1 specifies the Attributes for evaluating the quality of the derived en face image.​

Table C.8.17.15-1. Ophthalmic Optical Coherence Tomography En Face Image Quality Rating Module​

Attributes​

Attribute Name​

Tag​

Type​

Attribute Description​

Ophthalmic En Face Image​

(0022,1628)​

1​

Evaluation of the quality of the en face image.​

Quality Rating Sequence​

 

 

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

 

 

 

>Include Table 10-26 “Numeric Value Macro Attributes”​

 

Defined CID 4243 shall be used for Concept Name Code​

 

 

 

Sequence (0040,A043)​

>Quality Threshold​

(0022,1630)​

1​

Threshold for the quality value. If the Numeric Value​

 

 

 

(0040,A30A) of the Numeric Value Macro is equal or above​

 

 

 

the threshold, it is considered acceptable by the algorithm.​

The units of this Attribute shall be the same as defined in​ Measurement Units Code Sequence (0040,08EA) of the​ Numeric Value Macro.​

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

C.8.17.16 Ophthalmic Optical Coherence Tomography B-scan Volume Analysis Image​

Module​

Table C.8.17.16-1 specifies the Attributes that describe the Ophthalmic Optical Coherence Tomography B-scan Volume Analysis​ Image Module.​

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DICOM PS3.3 2020a - Information Object Definitions​ Page 1039​

Table C.8.17.16-1. Ophthalmic Optical Coherence Tomography B-scan Volume Analysis Image Module​

Attributes​

Attribute Name​

Tag​

Type​

Attribute Description​

Image Type​

(0008,0008)​

1​

Image identification characteristics.​

 

 

 

Enumerated Values for Value 1:​

 

 

 

ORIGINAL​

 

 

 

Enumerated Values for Value 2:​

 

 

 

PRIMARY​

Instance Number​

(0020,0013)​

1​ A number that identifies this SOP Instance.​

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.​

Bits Allocated​

(0028,0100)​

1​ Number of bits allocated for each pixel sample.​

 

 

 

Enumerated Values:​

 

 

 

8​

 

 

 

16​

Bits Stored​

(0028,0101)​

1​ Number of bits stored for each pixel sample.​

High Bit​

(0028,0102)​

1​ Most significant bit for pixel sample data. Shall be one less than​

 

 

 

the value in Bits Stored (0028,0101).​

Samples per Pixel​

(0028,0002)​

1​ Number of samples (planes) in this image.​

 

 

 

Enumerated Values:​

 

 

 

1​

Photometric Interpretation​

(0028,0004)​

1​ Specifies the intended interpretation of the pixel data.​

 

 

 

Enumerated Value:​

 

 

 

MONOCHOME2​

Pixel Representation​

(0028,0103)​

1​ Data representation of pixel samples.​

 

 

 

Enumerated Values:​

 

 

 

1​

Presentation LUT Shape​

(2050,0020)​

1​ Specifies an identity transformation for the Presentation LUT such​

 

 

 

that the output of all grayscale transformations are defined to be​

 

 

 

in P-Values.​

 

 

 

Enumerated Values:​

 

 

 

IDENTITY​ output is in P-Values​

Lossy Image Compression​

(0028,2110)​

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

 

 

 

apointinitslifetime),orisderivedfromlossycompressedimages.​

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.8.32.2.1 and Section C.7.6.1.1.5.​

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Page 1040​

DICOM PS3.3 2020a - Information Object Definitions​

Attribute Name​

Tag​

Type​

Attribute Description​

Lossy Image Compression​

(0028,2112)​

1C​

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

Ratio​

 

 

been applied to this image.​

 

 

 

See Section C.7.6.1.1.5.2.​

 

 

 

Required if present in the source images or this IOD instance has​

 

 

 

been compressed.​

Lossy Image Compression​

(0028,2114)​

1C​

Alabelforthelossycompressionmethod(s)thathavebeenapplied​

Method​

 

 

to this image.​

 

 

 

See Section C.7.6.1.1.5.1.​

 

 

 

Required if present in the source images or this IOD instance has​

 

 

 

been compressed. See Section C.8.32.2.1.​

Burned In Annotation​

(0028,0301)​

1​

Indicates whether or not image contains sufficient burned in​

 

 

 

annotationtoidentifythepatientanddatetheimagewasacquired.​

 

 

 

Enumerated Values:​

 

 

 

NO​

RecognizableVisualFeatures​

(0028,0302)​

1​

Indicateswhetherornottheimagecontainssufficientlyrecognizable​

 

 

 

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

 

 

 

images to identify the patient.​

 

 

 

Enumerated Values:​

 

 

 

YES​

 

 

 

NO​

Acquisition Method Algorithm​

(0022,1423)​

1​

Software algorithm used by the acquisition method.​

Sequence​

 

 

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

 

 

 

>Include Table 10-19 “Algorithm Identification Macro Attributes”​For Algorithm Family Code Sequence (0066,002F) Baseline CID​

 

 

 

4270 “OCT-A Processing Algorithm Families”.​

OCT B-scan Analysis​

(0022,1640)​

1​

Conveys raw data parameters captured during the B-scan​

Acquisition Parameters​

 

 

acquisition process.​

Sequence​

 

 

One or more Items are permitted in this Sequence. More than one​

 

 

 

 

 

 

Itemindicatesthatmultiplescanpatternshavebeenusedtoacquire​

 

 

 

the raw data. See Section C.8.17.16.2 for further explanation.​

>Scan Pattern Type Code​

(0022,1618)​

1​

The scan pattern type used to generate this SOP Instance.​

Sequence​

 

 

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

 

 

 

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

Defined CID CID 4272 “Opt Scan Pattern Types”​

>Number Of B-scans Per​

(0022,1642)​

1​

The number of B-scans performed at the same spatial location​

Frame​

 

 

(B-scan slab). See Section C.8.17.16.2 for further explanation.​

>B-scan Slab Thickness​

(0022,1643)​

1​

Nominal thickness of each B-scan slab, in mm. See​

 

 

 

Section C.8.17.16.2 for further explanation.​

>Distance Between B-scan​

(0022,1644)​

1​

Nominal distance between adjacent B-scan slabs, in mm. See​

Slabs​

 

 

Section C.8.17.16.2 for further explanation.​

>B-scan Cycle Time​

(0022,1645)​

1C​

Nominal time (in msec) between individual B-scans. See​

 

 

 

Section C.8.17.16.1.1 for further explanation.​

Required if B-scan Cycle Time Vector (0022,1646) is absent.​

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