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DICOM PS3.3 2020a - Information Object Definitions​

Page 1211​

 

 

Shot 1

Shot 2

 

 

 

 

 

 

 

 

 

 

time

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Acquisition DateTime (0008,002A)

Shot Duration Time (0080,0004)

Shot Offset Time (0080,0005)

Figure C.8.29.2-1. Timing Attributes Illustration​

C.8.30 Corneal Topography Map Modules​

C.8.30.1 Corneal Topography Map Series Module​

Table C.8.30.1-1 specifies the Attributes that identify and describe general information about the Corneal Topography Map Series.​

Table C.8.30.1-1. Corneal Topography Map Series Module Attributes​

Attribute Name​

Tag​

Type​

Attribute Description​

Modality​

(0008,0060)​

1​

Type of equipment that created the maps in this Series.​

 

 

 

Enumerated Values:​

 

 

 

OPM​

 

 

 

See Section C.7.3.1.1.1 for further explanation.​

Referenced Performed​

(0008,1111)​

1C​

Uniquely identifies the Performed Procedure Step SOP Instance to​

ProcedureStepSequence​

 

 

which the Series is related (e.g., a Modality or General-Purpose​

 

 

 

Performed Procedure Step SOP Instance).​

 

 

 

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

 

 

 

Required if the Modality Performed Procedure Step SOP Class, or​

 

 

 

GeneralPurposePerformedProcedureStepSOPClassissupported.​

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

 

Attributes”​

 

 

 

Body Part Examined​

(0018,0015)​

1​

Text description of the part of the body examined.​

 

 

 

Enumerated Values:​

 

 

 

EYE​

Note​

Some IODs support the Anatomic Region Sequence​ (0008,2218), which can provide a more comprehensive​ mechanism for specifying the body part being examined.​

C.8.30.2 Corneal Topography Map Image Module​

Table C.8.30.2-1 specifies the Attributes that describe an Image produced by corneal topography mapping devices.​

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Page 1212​ DICOM PS3.3 2020a - Information Object Definitions​

Table C.8.30.2-1. Corneal Topography Map Image Module Attributes​

Attribute Name​

Tag​

Type​

Attribute Description​

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.8.30.2.1.1 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​

Photometric​

(0028,0004)​

1​

Specified the intended interpretation of the pixel data.​

Interpretation​

 

 

See Section C.7.6.3.1.2 for further explanation.​

 

 

 

 

 

 

Enumerated Values:​

 

 

 

PALETTE COLOR​

Pixel Representation​

(0028,0103)​

1​

Data representation of pixel samples.​

 

 

 

Enumerated Values:​

 

 

 

0000H​unsigned integer​

Include Table 10-10 “Basic Pixel Spacing Calibration Macro​

Attributes”​

 

 

 

Pixel Aspect Ratio​

(0028,0034)​

1​

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

 

 

 

specified by a pair of integer values where the first value is the vertical​

 

 

 

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

Bits Allocated​

(0028,0100)​

1​

Numberofbitsallocatedforeachpixelsample.Eachsampleshallhave​

 

 

 

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​

 

 

 

same high bit. High Bit (0028,0102) shall be one less than Bits Stored​

 

 

 

(0028,0101).​

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DICOM PS3.3 2020a - Information Object Definitions​

Page 1213​

Attribute Name​

Tag​

Type​

Attribute Description​

 

Lossy Image​

(0028,2110)​

1​

Specifies whether an Image has undergone lossy compression.​

Compression​

 

 

Enumerated Values:​

 

 

 

 

 

 

 

 

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

 

 

 

01​Image has been subjected to lossy compression.​

 

 

 

 

See Section C.7.6.1.1.5 for further explanation.​

 

Lossy Image​

(0028,2112)​

1C​

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

Compression 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​

(0028,2114)​

1C​

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

Compression Method​

 

 

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​

Indicatesthattheimagedoesnotcontainburnedinannotationtoidentify​

 

 

 

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:​

 

 

 

YES​

 

 

 

Note​

 

 

 

Corneal topography is similar to finger prints as it is unique to​

 

 

 

individuals. Therefore, it could be used by a trained person or​

 

 

 

an expert system to identify the patient.​

Image Laterality​

(0020,0062)​

1​

Lateralityofobjectimaged(asdescribedinAnatomicRegionSequence​

 

 

 

(0008,2218)) examined.​

Enumerated Values:​

R​right eye​

L​left eye​

Note​

ThisAttributeismandatory,inordertoensurethatimagesmay​ be positioned correctly relative to one another for display.​

Shall be consistent with any laterality information contained in Primary​

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

Note​

Laterality (0020,0060) is a Series level Attribute and must be​ thesameforall ImagesintheSeries,henceitmust be absent.​

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Page 1214​

DICOM PS3.3 2020a - Information Object Definitions​

Attribute Name​

Tag​

Type​

Attribute Description​

IncludeTableC.7.6.16-12“RealWorldValueMappingMacro​Defined CID for Measurement Units Code Sequence is 4267​ Attributes”​

Include Table 10-5 “General Anatomy Mandatory Macro​

The concept code for Anatomic Region Sequence (0008,2218) shall be​

Attributes”​

(81745001,SCT,"Eye"),andDefinedCID244“Laterality”shallbeused​

 

for Anatomic Region Modifier Sequence (0008,2220).​

 

DCID 4266 “Ophthalmic Anatomic Structure Reference Point” shall be​

 

used for Primary Anatomic Structure Sequence (0008,2228). Only a​

 

single Item shall be included in this Sequence.​

 

Note​

 

Although Primary Anatomic Structure Sequence (0008,2228)​

 

is Type 3, it is important to convey this information if able to​

 

be determined.​

C.8.30.2.1 Corneal Topography Map Image Module Attribute Descriptions​

C.8.30.2.1.1 Image Type​

For Corneal Topography Maps, Image Type (0008,0008) is specified to be Type 1.​

Defined Terms for Image Type Value 3:​

CORNEAL_TOPO​Identifies a topographic map of the cornea​

C.8.30.2.1.2 Corneal Topography Map Real World Value and Image Transformations​

The Corneal Topography Map SOP Class supports a sequence of transformations that completely define the conversion of a stored​ image into a displayed image.​

The sequence of transformations from corneal measurements to a displayable image is explicitly defined in Figure C.8.30.2.1-1.​ Figure C.8.30.2.1-1 also conveys the transformation to display the scaling of the color map using its Real World Value Macro (see​ Table C.7.6.16-12 for more details on the Real World Value Macro).​

Color

Palette DISPLAY

LUT

Corneal

Measurements

Real-Value LUT Data (0040, 9212)

 

 

 

 

 

 

Real World

 

Value

Unit

 

or

 

 

Measurement Units

 

 

Real World Value

Value

Code Sequence

Intercept and Slope attributes

 

 

 

(0040,08EA)

 

 

 

 

 

 

 

Figure C.8.30.2.1-1. Corneal Topography Map Real World Value and Image Transformation Pipeline​

An SCP of the Corneal Topography Map Storage SOP Class, when rendering SOP Instances of the Class shall apply the image​ transformations (i.e., Palette Color LUT) and the Real World Value LUT to display the annotated color scale. The annotated color​ scale shall conform to the "ISO Standard 19980 - Ophthalmic instruments - Corneal topographers, second edition, section B.4​ Standardized colour Scale."​

C.8.30.3 Corneal Topography Map Analysis Module​

Table C.8.30.3-1 specifies the Attributes that describe the corneal Topography map analysis.​

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DICOM PS3.3 2020a - Information Object Definitions​ Page 1215​

Table C.8.30.3-1. Corneal Topography Map Analysis 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.8.30.3.1.1 for further explanation.​

 

 

 

Defined Terms:​

 

 

 

 

REFLECTION​

Reflection topography (i.e., placido, grid, etc.)​

 

 

 

SLIT_BASED​

Slit based elevation tomography​

 

 

 

INTERFEROMETRY​E.g., Optical coherence tomography​

Corneal Vertex Location​

(0046,0202)​

1​

Location of the corneal vertex. This is used for the reference point for other​

 

 

 

AttributeswithinthisSOPInstanceanddeterminedbytheImagereferenced​

 

 

 

intheAttributeSourceImageSequence(0008,2112).Givenascolumn\row.​

 

 

 

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

 

 

 

Image relative position specified with sub-pixel resolution such that the​

 

 

 

origin at the Top Left Hand Corner (TLHC) of the TLHC pixel is 0.0\0.0, the​

 

 

 

Bottom Right Hand Corner (BRHC) of the TLHC pixel is 1.0\1.0, and the​

 

 

 

BRHC of the BRHC pixel is Columns\Rows (see Figure C.10.5-1). The​

 

 

 

values must be within the range 0\0 to Columns\Rows.​

 

 

 

This location shall anchor the corneal vertex at the x, y and z coordinates​

 

 

 

of 0.0, 0.0, 0.0, in mm. See Section C.8.30.3.1.4 for further explanation.​

Corneal Topography​

(0046,0201)​

1​

Identifies the surface of the corneal topography map.​

Surface​

 

 

Enumerated Values:​

 

 

 

 

 

 

A​Anterior​

 

 

 

 

P​Posterior​

 

Pupil Centroid​

(0046,0203)​

1C​

The horizontal coordinate of the centroid of the pupil relative to location of​

X-Coordinate​

 

 

the cornea vertex specified in the Attribute Corneal Vertex Location​

 

 

 

(0046,0202), in mm, such that toward the right is positive. See​

 

 

 

Section C.8.30.3.1.4 for further explanation.​

 

 

 

Required if Attribute Corneal Topography Surface (0046,0201) is A​

 

 

 

(Anterior).​

 

 

 

 

Note​

 

 

 

 

This Attribute is conveyed in mm from the corneal vertex because​

 

 

 

displayapplicationswillhavezoomand3-Drotationalcapabilities.​

Pupil Centroid​

(0046,0204)​

1C​

The vertical coordinate of the centroid of the pupil relative to location of the​

Y-Coordinate​

 

 

corneavertexspecifiedintheAttributeCornealVertexLocation(0046,0202),​

 

 

 

in mm, such that up is positive. See Section C.8.30.3.1.4 for further​

 

 

 

explanation.​

 

Required if Attribute Corneal Topography Surface (0046,0201) is A​ (Anterior).​

Note​

This Attribute is conveyed in mm from the corneal vertex because​ displayapplicationswillhavezoomand3-Drotationalcapabilities.​

- Standard -​

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