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Page 1076​

DICOM PS3.3 2020a - Information Object Definitions​

C.8.20.1 Segmentation Series Module​

Table C.8.20-1 defines the general Attributes of the Segmentation Series Module.​

Table C.8.20-1. Segmentation Series Module Attributes​

Attribute Name​

Tag​

Type​

Attribute Description​

Modality​

(0008,0060)​

1​

Modality type​

 

 

 

Enumerated Values:​

 

 

 

SEG​

Series Number​

(0020,0011)​

1​

A number that identifies this Series​

Referenced Performed​

(0008,1111)​

1C​

Uniquely identifies the Performed Procedure Step SOP​

Procedure Step Sequence​

 

 

Instance to which the Series is related​

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

Required if a Performed Procedure Step SOP Class​ was involved in the creation of this Series.​

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

C.8.20.2 Segmentation Image Module​

Table C.8.20-2 defines the general Attributes of the Segmentation Image Module.​

Table C.8.20-2. Segmentation Image Module Attributes​

Attribute Name​

Tag​

Type​

Attribute Description​

Image Type​

(0008,0008)​

1​

Value1shallbeDERIVED.Value2shallbePRIMARY.Noothervalues​

 

 

 

shall be present.​

IncludeTable10-12“ContentIdentificationMacroAttributes”​

Image Orientation (Slide)​

(0048,0102)​

1C​

The direction cosines of the first row and the first column of the total​

 

 

 

pixel matrix with respect to the Slide Coordinate System Frame of​

 

 

 

Reference. See Section C.8.12.4.1.4.​

 

 

 

Required if Plane Position (Slide) Sequence (0048,021A) is present​

 

 

 

within a Functional Group Sequence.​

Samples Per Pixel​

(0028,0002)​

1​

Enumerated Values:​

 

 

 

1​

Photometric Interpretation​

(0028,0004)​

1​

Enumerated Values:​

 

 

 

MONOCHROME2​

Pixel Representation​

(0028,0103)​

1​

Enumerated Values:​

 

 

 

0​

Bits Allocated​

(0028,0100)​

1​

See Section C.8.20.2.1.​

 

 

 

Enumerated Values if Segmentation Type (0062,0001) is BINARY:​

 

 

 

1​

Enumerated Values if Segmentation Type (0062,0001) is not BINARY:​

8​

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DICOM PS3.3 2020a - Information Object Definitions​

Page 1077​

Attribute Name​

Tag​

Type​

Attribute Description​

 

Bits Stored​

(0028,0101)​

1​

See Section C.8.20.2.1.​

 

 

 

 

Enumerated Values if Segmentation Type (0062,0001) is BINARY:​

 

 

 

1​

 

 

 

 

Enumerated Values if Segmentation Type (0062,0001) is not BINARY:​

 

 

 

8​

 

High Bit​

(0028,0102)​

1​

See Section C.8.20.2.1.​

 

 

 

 

Enumerated Values if Segmentation Type (0062,0001) is BINARY:​

 

 

 

0​

 

 

 

 

Enumerated Values if Segmentation Type (0062,0001) is not BINARY:​

 

 

 

7​

 

LossyImageCompression​

(0028,2110)​

1​

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

 

 

 

point in its lifetime), or is derived from lossy compressed images.​

 

 

 

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.8.20.2.2 and Section C.7.6.1.1.5, “Lossy Image​

 

 

 

Compression”.​

 

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 present in the source images or this IOD instance has been​

 

 

 

compressed.​

 

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 present in the source images or this IOD instance has been​

 

 

 

compressed. See Section C.8.20.2.2.​

 

Segmentation Type​

(0062,0001)​

1​

The type of encoding used to indicate the presence of the segmented​

 

 

 

property at a pixel/voxel location.​

 

 

 

 

Enumerated Values:​

 

 

 

 

BINARY​

 

 

 

 

FRACTIONAL​

 

 

 

 

See Section C.8.20.2.3.​

 

Segmentation Fractional​

(0062,0010)​

1C​

For fractional segmentation encoding, the meaning of the fractional​

Type​

 

 

value.​

 

Required if Segmentation Type (0062,0001) is FRACTIONAL.​

See Section C.8.20.2.3 for Enumerated Values.​

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Page 1078​

DICOM PS3.3 2020a - Information Object Definitions​

Attribute Name​

Tag​

Type​

 

Attribute Description​

MaximumFractionalValue​

(0062,000E)​

1C​

Specifies the value that represents a probability of 1 or complete​

 

 

 

occupancy. There shall be no values in Pixel Data (7FE0,0010) greater​

 

 

 

than this value. Required if Segmentation Type (0062,0001) is​

 

 

 

FRACTIONAL.​

Segments Overlap​

(0062,0013)​

3​

Whether or not any segments in this instance overlap. I.e., whether or​

 

 

 

not any pixel is or might be in more than one segment.​

 

 

 

Enumerated Values:​

 

 

 

YES​

Some segments overlap​

 

 

 

UNDEFINED​Some segments might overlap​

 

 

 

NO​

No segments overlap​

 

 

 

See Section C.8.20.2.3.​

 

 

 

Note​

 

 

 

 

If the value is NO, then a receiving application to which this​

 

 

 

matters can be assured that no segments overlap and does​

 

 

 

not need to check every pixel. If the value is UNDEFINED or​

 

 

 

YES, or the Attribute is absent, then a receiving application​

 

 

 

might need to check every pixel in every segment.​

Segment Sequence​

(0062,0002)​

1​

Describes the segments that are contained within the data.​

 

 

 

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

>Include Table C.8.20-4 “Segment Description Macro​

 

 

Attributes”​

 

 

 

 

>Segment Algorithm​

(0062,0009)​

1C​

Name of algorithm used to generate the segment. Required if Segment​

Name​

 

 

Algorithm Type (0062,0008) is not MANUAL.​

>Segmentation Algorithm​

(0062,0007)​

3​

A description of how this segment was derived.​

Identification Sequence​

 

 

Algorithm Name (0066,0036) within this Sequence may be identical to​

 

 

 

 

 

 

Segment Algorithm Name (0062,0009).​

 

 

 

Only a single Item is permitted in this Sequence.​

 

 

 

Note​

 

 

 

 

Previously, the Segment Surface Generation Algorithm​

 

 

 

Identification Code Sequence (0066,002D) was used, but it​

 

 

 

has been replaced in this Module, since not all segmentation​

 

 

 

algorithms involve surface generation. See PS3.3 2016d.​

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

BCID 7162 “Surface Processing Algorithm Families”.​

Attributes”​

 

 

 

 

>Recommended Display​

(0062,000C)​

3​

A default single gray unsigned value in which it is recommended that​

Grayscale Value​

 

 

themaximumpixelvalueinthissegmentberenderedonamonochrome​

 

 

 

display. The units are specified in P-Values from a minimum of 0000H​

 

 

 

(black) up to a maximum of FFFFH (white).​

 

 

 

Note​

 

 

 

 

The maximum P-Value for this Attribute may be different from​

 

 

 

themaximumP-ValuefromtheoutputofthePresentationLUT,​

 

 

 

which may be less than 16 bits in depth.​

>Recommended Display​

(0062,000D)​

3​

A default triplet value in which it is recommended that segment be​

CIELab Value​

 

 

rendered on a color display. The units are specified in PCS-Values, and​

 

 

 

the value is encoded as CIELab. See Section C.10.7.1.1.​

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DICOM PS3.3 2020a - Information Object Definitions​

Page 1079​

C.8.20.2.1 Bits Allocated and Bits Stored​

As a consequence of the enumerated Bits Allocated and Bits Stored Attribute values, single bit pixels shall be packed 8 to a byte as​ defined by the encoding rules in PS3.5.​

C.8.20.2.2 Lossy Image Compression and Lossy Image Compression Method​

If Lossy Image Compression (0028,2110) in any of the source images is "01", the value shall be "01" for the Segmentation instance.​

The process of segmentation itself is defined not to be lossy compression, even though it involves loss. If the Segmentation instance​ is encoded using a lossy compression Transfer Syntax, then the value shall be set to "01".​

Note​

It is not advisable to lossy compress a Segmentation SOP Instance. In particular, a binary segmentation should not be lossy​ compressed.​

C.8.20.2.3 Segmentation Type, Segmentation Fractional Type and Segments Overlap​

A Segmentation Type (0062,0001) of BINARY indicates the segmented property is present with a value of 1 and absent with a value​ of 0.​

For a Segmentation Type (0062,0001) of FRACTIONAL the segmented property is defined as a value from zero to the Maximum​ FractionalValue(0062,000E).AFRACTIONALsegmentationshallbefurtherspecifiedviaSegmentationFractionalType(0062,0010).​

Enumerated Values of Segmentation Fractional Type (0062,0010):​

PROBABILITY​Defines the probability, as a ratio of the pixel value to the Maximum Fractional Value, that the segmented property​ occupies the spatial area defined by the voxel.​

OCCUPANCY​ Defines the proportion of the pixel volume occupied by the segmented property as the ratio of the pixel value to the​ Maximum Fractional Value.​

Note​

Binary segmentation instances may be transformed into or from "label maps", in which each pixel contains a coded value​ that indicates the segment, rather than the Segmentation IOD representation that encodes separate bitplanes for each​ segment. This conversion is facilitated by knowing whether or not any segment bitplanes overlap. A Segments Overlap​ (0062,0013)valueofNOindicatestheycanbeconvertedinto(ormayhavebeenconvertedfrom)alabelmaprepresentation​ without the need to check every pixel.​

C.8.20.2.4 Segment Number​

Segment Number (0062,0004) shall be unique within each instance, start at a value of 1, and increase monotonically by 1.​

C.8.20.3 Segmentation Functional Group Macros​

The following sections contain Functional Group Macros specific to the Segmentation IOD.​

Note​

The Attribute descriptions in the Functional Group Macros are written as if they were applicable to a single frame (i.e., the​ Macro is part of the Per-frame Functional Groups Sequence). If an Attribute is applicable to all frames (i.e., the Macro is part​ of the Shared Functional Groups Sequence) the phrase "this frame" in the Attribute description shall be interpreted to mean​ "for all frames".​

C.8.20.3.1 Segmentation Macro​

Table C.8.20-3 specifies the Attributes of the Segmentation Functional Group Macro.​

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Page 1080​ DICOM PS3.3 2020a - Information Object Definitions​

Table C.8.20-3. Segmentation Macro Attributes​

Attribute Name​

Tag​

Type​

Attribute Description​

SegmentIdentificationSequence​

(0062,000A)​

1​

Identifies the characteristics of this frame.​

 

 

 

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

>Referenced Segment Number​

(0062,000B)​

1​

UniquelyidentifiesthesegmentdescribedinSegmentSequence​

 

 

 

(0062,0002) by reference to Segment Number (0062,0004).​

Referenced Segment Number (0062,000B) shall not be​ multi-valued.​

C.8.20.4 Segmentation Macros​

The following sections contain Macros specific to the Segmentation IOD.​

C.8.20.4.1 Segment Description Macro​

Table C.8.20-4 specifies the Attributes of the Segment Description Macro.​

Table C.8.20-4. Segment Description Macro Attributes​

Attribute Name​

Tag​

Type​

 

Attribute Description​

Segment Number​

(0062,0004)​

1​

Identification number of the segment. The value of Segment Number​

 

 

 

(0062,0004) shall be unique within the Segmentation instance in which​

 

 

 

it is created. See Section C.8.20.2.4.​

Segment Label​

(0062,0005)​

1​

User-defined label identifying this segment. This may be the same as​

 

 

 

Code Meaning (0008,0104) of Segmented Property Type Code​

 

 

 

Sequence (0062,000F).​

Segment Description​

(0062,0006)​

3​

User-defined description for this segment.​

SegmentAlgorithmType​

(0062,0008)​

1​

Type of algorithm used to generate the segment.​

 

 

 

Enumerated Values:​

 

 

 

AUTOMATIC​

calculated segment​

 

 

 

SEMIAUTOMATIC​calculated segment with user assistance​

 

 

 

MANUAL​

user-entered segment​

IncludeTable10-7b“MultipleSiteGeneralAnatomyOptional​May not be necessary if the anatomy is implicit in the Segmented​ Macro Attributes”​ Property Type Code Sequence.​

 

 

 

More than one Item in Anatomic Region Sequence (0008,2218) may​

 

 

 

be used when a region of interest spans multiple anatomical locations​

 

 

 

and there is not a single pre-coordinated code describing the​

 

 

 

combination of locations. There is no requirement that the multiple​

 

 

 

locations be contiguous.​

Segmented Property​

(0062,0003)​

1​

Sequence defining the general category of the property the segment​

Category Code​

 

 

represents.​

Sequence​

 

 

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

 

 

 

>Include Table 8.8-1 “Code Sequence Macro Attributes”​ BCID 7150 “Segmentation Property Categories”.​

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