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DICOM PS3.3 2020a - Information Object Definitions​

Page 721​

C.8.8.3.4 Image Pixel Module Attributes​

C.8.8.3.4.1 Samples Per Pixel​

Enumerated Values:​

1​

C.8.8.3.4.2 Photometric Interpretation​

Enumerated Values:​

MONOCHROME2​

C.8.8.3.4.3 Bits Allocated​

Enumerated Values:​

16​

32​

C.8.8.3.4.4 Bits Stored​

For RT Doses, Bits Stored (0028,0101) shall be equal to Bits Allocated (0028,0100).​

C.8.8.3.4.5 High Bit​

For RT Doses, High Bit (0028,0102) shall be one less than the value of Bits Stored (0028,0101).​

C.8.8.3.4.6 Pixel Representation​

Enumerated Values when Dose Type (3004,0004) = ERROR:​

0001H​two's complement integer,​

Enumerated Values when Dose Type (3004,0004) not ERROR:​

0000H​unsigned integer, otherwise.​

C.8.8.3.5 Referenced Spatial Registration Sequence​

This Sequence lists the registrations used to create the dose. It is important to note, that this Sequence does not make any statement​ about how the dose was calculated or about the scope of objects contributing to a summed dose.​

C.8.8.4 RT DVH Module​

The RT DVH Module provides for the inclusion of differential or cumulative dose volume histogram data. The data contained within​ this Module may supplement dose data in the RT Dose Module and/or RT Dose ROI Module, or it may be present in the absence of​ other dose data.​

Table C.8-40. RT DVH Module Attributes​

Attribute Name​

Tag​

Type​

Attribute Description​

Referenced Structure Set​

(300C,0060)​

1​

Sequenceofoneclass/instancepairdescribingStructureSetcontaining​

Sequence​

 

 

structuresthatareusedtocalculateDose-VolumeHistograms(DVHs).​

 

 

 

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

 

 

 

Section C.8.8.4.1.​

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

 

Attributes”​

 

 

 

DVH Normalization Point​

(3004,0040)​

3​

Coordinates (x, y, z) of common DVH normalization point in the​

 

 

 

Patient-Based Coordinate System described in Section C.7.6.2.1.1​

 

 

 

(mm).​

- Standard -​

Page 722​

DICOM PS3.3 2020a - Information Object Definitions​

Attribute Name​

Tag​

Type​

 

 

Attribute Description​

DVH Normalization Dose​

(3004,0042)​

3​ DoseValueatDVHNormalizationPoint(3004,0040)usedasreference​

Value​

 

 

for individual DVHs when Dose Units (3004,0002) is RELATIVE.​

DVH Sequence​

(3004,0050)​

1​

Sequence of DVHs.​

 

 

 

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

>DVH Referenced ROI​

(3004,0060)​

1​ Sequence of referenced ROIs used to calculate DVH.​

Sequence​

 

 

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

 

 

 

>>ReferencedROINumber​

(3006,0084)​

1​ UniquelyidentifiesROIusedtocalculateDVHspecifiedbyROINumber​

 

 

 

(3006,0022) in Structure Set ROI Sequence (3006,0020) in Structure​

 

 

 

Set Module within RT Structure Set referenced by referenced RT Plan​

 

 

 

in Referenced RT Plan Sequence (300C,0002) in RT Dose Module.​

>>DVH ROI Contribution​

(3004,0062)​

1​ Specifies whether volume within ROI is included or excluded in DVH.​

Type​

 

 

See Section C.8.8.4.2.​

 

 

 

Enumerated Values:​

 

 

 

INCLUDED​

 

 

 

 

 

EXCLUDED​

 

 

>DVH Type​

(3004,0001)​

1​

Type of DVH.​

 

 

 

 

Enumerated Values:​

 

 

 

DIFFERENTIAL​differential dose-volume histogram​

 

 

 

CUMULATIVE​

cumulative dose-volume histogram​

 

 

 

NATURAL​

 

natural dose volume histogram​

>Dose Units​

(3004,0002)​

1​

Dose axis units.​

 

 

 

 

Enumerated Values:​

 

 

 

GY​

Gray​

 

 

 

RELATIVE​dose relative to reference value specified in DVH​

 

 

 

 

Normalization Dose Value (3004,0042)​

>Dose Type​

(3004,0004)​

1​

Type of dose.​

 

 

 

 

Defined Terms:​

 

 

 

 

PHYSICAL​ physical dose​

 

 

 

EFFECTIVE​physical dose after correction for biological effect using​

 

 

 

 

user-defined modeling technique​

 

 

 

ERROR​ difference between desired and planned dose​

>DVH Dose Scaling​

(3004,0052)​

1​ ScalingfactorthatwhenmultipliedbythedosebinwidthsfoundinDVH​

 

 

 

Data (3004,0058), yields dose bin widths in the dose units as specified​

 

 

 

by Dose Units (3004,0002).​

>DVH Volume Units​

(3004,0054)​

1​

Volume axis units.​

Defined Terms:​

CM3​ cubic centimeters​

PERCENT​percent​

PER_U​ volumeperuwithu(dose)=dose-3/2.SeeSectionC.8.8.4.3.​

>DVH Number of Bins​

(3004,0056)​

1​ Number of bins n used to store DVH Data (3004,0058).​

- Standard -​

 

DICOM PS3.3 2020a - Information Object Definitions​

Page 723​

Attribute Name​

Tag​

Type​

Attribute Description​

 

>DVH Data​

(3004,0058)​

1​ AdatastreamdescribingthedosebinwidthsDnandassociatedvolumes​

 

 

 

VninDVHVolumeUnits(3004,0054)intheorderD1V1,D2V2,…DnVn.​

 

 

 

Note​

 

 

 

 

DVH Data arrays may not be properly encoded if Explicit VR​

 

 

 

Transfer Syntax is used and the VL of this Attribute exceeds​

 

 

 

65534 bytes.​

 

>DVH Minimum Dose​

(3004,0070)​

3​ MinimumcalculateddosetoROI(s)describedbyDVHReferencedROI​

 

 

 

Sequence (3004,0060) in units specified by Dose Units (3004,0002) of​

 

 

 

the current Sequence Item.​

 

>DVH Maximum Dose​

(3004,0072)​

3​ MaximumcalculateddosetoROI(s)describedbyDVHReferencedROI​

 

 

 

Sequence (3004,0060) in units specified by Dose Units (3004,0002) of​

 

 

 

the current Sequence Item.​

 

>DVH Mean Dose​

(3004,0074)​

3​ Mean calculated dose to ROI(s) described by DVH Referenced ROI​

 

 

 

Sequence (3004,0060) in units specified by Dose Units (3004,0002) of​

 

 

 

the current Sequence Item.​

 

C.8.8.4.1 Referenced Structure Set Sequence​

TheReferencedStructureSetSequence(300C,0060)isrequiredfordirectcross-referenceofthedosebindatawiththecorresponding​ ROI(s)fromwhichtheywerederived.ROIsreferencedbytheDVHReferencedROISequence(3004,0050)shallonlycontaincontours​ with a Contour Geometric Type (3006,0042) of POINT or CLOSED_PLANAR.​

C.8.8.4.2 DVH ROI Contribution Type​

The volume used to calculate the DVH shall be the geometric union of ROIs where DVH ROI Contribution Type (3004,0062) is IN-​ CLUDED, minus the geometric union of ROIs where DVH ROI Contribution Type (3004,0062) is EXCLUDED.​

C.8.8.4.3 DVH Volume Units​

The unit PER_U is defined in: Anderson, LL: "A "natural" volume-dose histogram for brachytherapy", Medical Physics 13(6) pp 898-​ 903, 1986.​

C.8.8.5 Structure Set Module​

Astructuresetdefinesasetofareasofsignificance.EachareacanbeassociatedwithaFrameofReferenceandzeroormoreimages.​ Information that can be transferred with each region of interest (ROI) includes geometrical and display parameters, and generation​ technique.​

Table C.8-41. Structure Set Module Attributes​

Attribute Name​

Tag​

Type​

Attribute Description​

Structure Set Label​

(3006,0002)​

1​

User-defined label for Structure Set.​

Structure Set Name​

(3006,0004)​

3​

User-defined name for Structure Set.​

Structure Set Description​

(3006,0006)​

3​

User-defined description for Structure Set.​

Instance Number​

(0020,0013)​

3​

A number that identifies this object instance.​

Structure Set Date​

(3006,0008)​

2​

Date at which Structure Set was last modified.​

Structure Set Time​

(3006,0009)​

2​

Time at which Structure Set was last modified.​

ReferencedFrameofReference​

(3006,0010)​

3​

Sequence describing Frames of Reference in which the​

Sequence​

 

 

ROIs are defined. One or more Items are permitted in this​

 

 

 

Sequence. See Section C.8.8.5.1.​

>Frame of Reference UID​

(0020,0052)​

1​

Uniquely identifies Frame of Reference within Structure​

 

 

 

Set.​

- Standard -​

Page 724​

DICOM PS3.3 2020a - Information Object Definitions​

Attribute Name​

Tag​

Type​

 

Attribute Description​

>RT Referenced Study​

(3006,0012)​

3​

Sequence of Studies containing Series to be referenced.​

Sequence​

 

 

One or more Items are permitted in this Sequence.​

 

 

 

 

 

 

See Section C.8.8.5.4.​

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

 

 

>>RT Referenced Series​

(3006,0014)​

1​

Sequence describing Series of images within the​

Sequence​

 

 

referenced Study that are used in defining the Structure​

 

 

 

Set.​

 

 

 

 

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

>>>Series Instance UID​

(0020,000E)​

1​

Unique identifier for the Series containing the images.​

>>>Contour Image Sequence​

(3006,0016)​

1​

Sequence of Items describing images in a given Series​

 

 

 

used in defining the Structure Set (typically CT or MR​

 

 

 

images).​

 

 

 

 

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

>>>>IncludeTable10-3“ImageSOPInstanceReferenceMacroAttributes”​

 

Structure Set ROI Sequence​

(3006,0020)​

1​

ROIs for current Structure Set.​

 

 

 

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

>ROI Number​

(3006,0022)​

1​

IdentificationnumberoftheROI.ThevalueofROINumber​

 

 

 

(3006,0022) shall be unique within the Structure Set in​

 

 

 

which it is created.​

>Referenced Frame of​

(3006,0024)​

1​

Uniquely identifies Frame of Reference in which ROI is​

Reference UID​

 

 

defined,specifiedbyFrameofReferenceUID(0020,0052)​

 

 

 

inReferencedFrameofReferenceSequence(3006,0010).​

>ROI Name​

(3006,0026)​

2​

User-defined name for ROI.​

>ROI Description​

(3006,0028)​

3​

User-defined description for ROI.​

>ROI Volume​

(3006,002C)​

3​

Volume of ROI (cubic centimeters).​

>ROI Generation Algorithm​

(3006,0036)​

2​

Type of algorithm used to generate ROI.​

 

 

 

Defined Terms:​

 

 

 

AUTOMATIC​

calculated ROI​

 

 

 

SEMIAUTOMATIC​ROI calculated with user assistance​

 

 

 

MANUAL​

user-entered ROI​

>ROI Generation Description​

(3006,0038)​

3​

User-defined description of technique used to generate​

 

 

 

ROI.​

 

>ROI Derivation Algorithm​

(3006,0037)​

3​

Software algorithm that derived the ROI.​

Identification Sequence​

 

 

Only a single Item is permitted in this Sequence.​

 

 

 

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

 

 

>Derivation Code Sequence​

(0008,9215)​

3​

A coded description of how this ROI was derived.​

 

 

 

One or more Items are permitted in this Sequence.​

 

 

 

See Section C.8.8.5.3 for further explanation.​

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

 

Enumerated Value (113085, DCM, "Spatial resampling").​

- Standard -​

 

DICOM PS3.3 2020a - Information Object Definitions​

Page 725​

Attribute Name​

Tag​

Type​

Attribute Description​

 

>Definition Source Sequence​

(0008,1156)​

3​

Instances containing the source of the ROI Contour​

 

 

 

information.​

 

 

 

 

Only a single Item is permitted in this Sequence.​

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

 

 

>>ReferencedSegmentNumber​

(0062,000B)​

1C​

The value of Segment Number (0062,0004) in the​

 

 

 

referenced SOP Instance that identifies the segment that​

 

 

 

is the source of the ROI Contour information.​

 

 

 

 

Required if Referenced SOP Class UID (0008,1150) is​

 

 

 

Segmentation Storage ("1.2.840.10008.5.1.4.1.1.66.4").​

>>Referenced Fiducial UID​

(0070,031B)​

1C​

The value of Fiducials UID (0070,031A) in the referenced​

 

 

 

SOP Instance that identifies the fiducial that is the source​

 

 

 

of the ROI Contour information.​

 

 

 

 

Required if Referenced SOP Class UID (0008,1150) is​

 

 

 

SpatialFiducialsStorage("1.2.840.10008.5.1.4.1.1.66.2").​

Predecessor Structure Set​

(3006,0018)​

3​

The Structure Set that has been used to derive the current​

Sequence​

 

 

Structure Set.​

 

Only a single Item is permitted in this Sequence.​

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

C.8.8.5.1 Frames of Reference​

The Referenced Frame of Reference Sequence (3006,0010) describes a set of frames of reference in which some or all of the ROIs​ are expressed. Since the Referenced Frame of Reference UID (3006,0024) is required for each ROI, each Frame of Reference used​ to express the coordinates of an ROI shall be listed in the Referenced Frame of Reference Sequence (3006,0010) once and only​ once.​

Note​

As an example, a set of ROIs defined using a single image Series would list the image Series in a single Referenced Frame​ of Reference Sequence (3006,0010) Item, providing the UID for this referenced Frame of Reference (obtained from the​ source images), and listing all pertinent images in the Contour Image Sequence (3006,0016).​

C.8.8.5.2 Frame of Reference Relationship Sequence and Transformation Matrix​

Retired. See PS3.3-2011.​

The concept of definition of registered Frame of References using the Frame of Reference Relationship Sequence (3006,00C0)​ formerly present in the Standard is retired. The use of Registration IODs is advised since the introduction of Spatial Registration IOD,​ which is a much stronger and more general concept, and independent from the specifics of RT Structure Sets. Additionally it is of​ importance that registrations are decoupled from image and segmentation objects.​

C.8.8.5.3 ROI Derivation Sequence​

If an ROI is created by re-sampling an existing ROI that is either (a) present in a different Frame of Reference (FoR) and has been​ resampled to align with the image Series referenced by the current structure set, or (b) present in the same FoR, but its contours are​ referenced to a different image Series, it is useful to be able to identify that the ROI is resampled. The Derivation Code Sequence​ (0008,9215) shall be used with code (113085, DCM, "Spatial resampling") to indicate the resampled ROI.​

C.8.8.5.4 SOP Class UID in RT Referenced Study Sequence​

Since RT Referenced Study Sequence (3006,0012) is Type 3, the Attribute may be omitted.​

If RT Referenced Study Sequence (3006,0012) is present with an Item, the SOP Class UID of the Detached Study Management SOP​ Class (Retired) may be used in Referenced SOP Class UID (0008,1150).​

- Standard -​

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