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Page 1126​ DICOM PS3.3 2020a - Information Object Definitions​

Table C.8.24.1-1. Enhanced US Series Module Attributes​

Attribute Name​

Tag​

Type​

Attribute Description​

Modality​

(0008,0060)​

1​

Type of equipment that originally acquired the data used to​

 

 

 

create the images in this Series.​

 

 

 

Enumerated Values:​

 

 

 

US​

 

 

 

IVUS​

 

 

 

See Section C.7.3.1.1.1 for further explanation.​

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”​

 

Performed Protocol Code​

(0040,0260)​

1C​

Sequence describing a Protocol being followed for this​

Sequence​

 

 

Procedure Step.​

 

 

 

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

 

 

 

RequiredifaProtocoliscontrollingthecreationofthisSeries.​

 

 

 

May be present otherwise.​

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

 

BCID 12001 “Ultrasound Protocol Types”.​

>Protocol Context Sequence​

(0040,0440)​

3​

Sequence that specifies the context for the Performed​

 

 

 

Protocol Code Sequence (0040,0260) Item.​

 

 

 

One or more Items are permitted in this Sequence.​

>>Include Table 10-2 “Content Item Macro Attributes Description”​

No Baseline TID is defined.​

>>Content Item Modifier​

(0040,0441)​

3​

Sequence that specifies modifiers for a Protocol Context​

Sequence​

 

 

Content Item.​

 

 

 

One or more Items are permitted in this Sequence.​

 

 

 

See Section C.4.10.1.​

>>>Include Table 10-2 “Content Item Macro Attributes Description”​

No Baseline TID is defined.​

Performed Protocol Type​

(0040,0261)​

1C​

Type of protocol performed.​

 

 

 

Enumerated Values:​

STAGED​

NON_STAGED​

RequiredifPerformedProtocolCodeSequence(0040,0260)​ is present.​

C.8.24.2 Ultrasound Frame of Reference Module​

Table C.8.24.2-1 specifies the Attributes of the Ultrasound Frame Of Reference Module. See Section C.8.24.2.1.​

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DICOM PS3.3 2020a - Information Object Definitions​

Page 1127​

 

Table C.8.24.2-1. Ultrasound Frame of Reference Module Attributes​

 

Attribute Name​

Tag​

Type​

Attribute Description​

 

Volume Frame of​

(0020,9312)​

1​ Uniquely identifies this Volume Frame of Reference.​

 

Reference UID​

 

 

 

 

Ultrasound Acquisition​(0020,9307)​

1​ Characteristic of the ultrasound acquisition geometry.​

 

Geometry​

 

Defined Terms:​

 

 

 

 

 

 

 

 

APEX​ there exists an apex of the scan lines from which the volume data was​

 

 

acquired.​

 

 

 

PATIENT​the ultrasound acquisition geometry is patient relative​

 

 

 

Note​

 

 

 

 

When the value is PATIENT, the Plane Position (Patient) and Plane​

 

 

Orientation (Patient) Functional Group Macros will be present, and may or​

 

 

may not contain Attributes with identical values to the corresponding​

 

 

Attributes in the Plane Position (Volume) and Plane Orientation (Volume)​

 

 

Functional Group Macros; see Section A.59.4.1.2.​

 

Apex Position​

(0020,9308)​

1C​ Position of the apex (or phase center) of the acquisition geometry, encoded as xA,​

 

 

yA, and zA in mm units in the Volume Frame of Reference. The apex (xA, yA, zA) may​

 

 

be located in the volume or exterior to it.​

 

 

 

Required if value of Ultrasound Acquisition Geometry (0020,9307) is APEX.​

Volume to Transducer​(0020,930B)​

1C​ Relationship between the transducer and the acquired volume.​

 

Relationship​

 

Enumerated Values:​

 

 

 

 

 

 

FIXED​

Thetransducerpositionandorientationrelativetothevolume​

 

 

 

is constant and specified by Volume to Transducer Mapping​

 

 

 

Matrix (0020,9309).​

 

 

 

POSITION_VAR​

The transducer position relative to the volume varies during​

 

 

 

acquisitionandthepositionspecifiedbyVolumetoTransducer​

 

 

 

Mapping Matrix (0020,9309) is a nominal value. The​

 

 

 

transducer orientation relative to the volume is constant and​

 

 

 

specified by Volume to Transducer Mapping Matrix​

 

 

 

(0020,9309).​

 

 

 

ORIENTATION_VAR​Thetransducerorientationrelativetothevolumevariesduring​

 

 

 

acquisition and the orientation specified by Volume to​

 

 

 

Transducer Mapping Matrix (0020,9309) is a nominal value.​

 

 

 

Thetransducerpositionrelativetothevolumeisconstantand​

 

 

 

specified by Volume to Transducer Mapping Matrix​

 

 

 

(0020,9309).​

 

 

 

VARIABLE​

Thetransducerpositionandorientationrelativetothevolume​

 

 

 

varies during acquisition and the position and orientation​

 

 

 

specified by Volume to Transducer Mapping Matrix​

 

 

 

(0020,9309) are nominal.​

 

 

 

Required if the transducer position and/or orientation relative to the volume is not​

 

 

constant. May be present otherwise.​

 

Volume to Transducer​(0020,9309)​

1​ A 4x4 rigid transformation matrix that maps the Volume Frame of Reference​

Mapping Matrix​

 

homogeneouscoordinatesystem(XV,YV,ZV)totheTransducerFrameofReference​

 

 

homogeneous coordinate system (XX,YX, ZX). Matrix elements shall be listed in​

 

 

row-major order. See Section C.8.24.2.1 for details.​

 

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DICOM PS3.3 2020a - Information Object Definitions​

Attribute Name​

Tag​

Type​

Attribute Description​

Patient Frame of​

(0020,930C)​

1C​ Indicates how the supplied Image Position (Patient) (0020,0032) and Image​

Reference Source​

 

Orientation (Patient) (0020,0037) values are obtained.​

 

 

Enumerated Values:​

 

 

TABLE​

A positioning device, such as a gantry, was used to generate​

 

 

 

these values.​

 

 

ESTIMATED​ Estimated patient position / orientation (e.g., estimated by the​

 

 

 

user), or if reliable information is not available.​

 

 

REGISTRATION​Acquisition has been spatially registered to a prior image set.​

 

 

RequiredifeitherImagePosition(Patient)(0020,0032)orImageOrientation(Patient)​

 

 

(0020,0037) is present.​

Table Frame of​

(0020,9313)​

1C​ Uniquely identifies this Table Frame of Reference.​

Reference UID​

 

Required if Patient Frame of Reference Source (0020,930C) is TABLE.​

 

 

Volume to Table​

(0020,930A)​

1C​ A 4x4 rigid transformation matrix that maps the Volume Frame of Reference​

Mapping Matrix​

 

homogeneous coordinate system (XV,YV, ZV) to the Table Frame of Reference​

 

 

homogeneous coordinate system (XT,YT, ZT). Matrix elements shall be listed in​

 

 

row-major order. See Section C.8.24.2.2 for details.​

 

 

Required if Patient Frame of Reference Source (0020,930C) is TABLE.​

C.8.24.2.1 Ultrasound Frame of Reference Module Overview​

TheUltrasoundFrameofReferenceModuleisusedtorelatetheimageplanestoaFrameofReferenceappropriatefortheultrasound​ modality, most notably a volume-based Frame of Reference. There are many different transducer scan acquisition geometries used​ in 3D ultrasound imaging. Regardless of the acquisition geometry, after acquisition of the initial scan images comprising the volume,​ the ultrasound (US) scanner will assemble (reformat) the data into a proper Cartesian volume with the assumption that the data are​ related through a Right-Hand Coordinate System (RHCS). x-positions are defined in mm with positive values increasing towards the​ right. y-positions are defined in mm with positive values in the direction of increasing image depth. z-positions are defined in mm with​ positive values in the direction as defined in a right-hand coordinate system.​

A Cartesian volume will consist of a series of 1 to n parallel planes. The image planes comprising the Cartesian volume are typically​ oriented during creation of the volume so that the best image quality is in the XY plane. Table C.8.24.2-1 specifies the Attributes of​ theUltrasoundFrameofReferenceModule.TherearethreelevelsofdetailfortheUltrasoundFrameofReference:Volume,Transducer​ and Table.​

C.8.24.2.1.1 Volume Frame of Reference​

TheVolumeFrameofReferenceisaRight-handCoordinateSystemconsistingofaVolumeOriginatthelocation(0,0,0)andmutually​ orthogonal XV, YV, and ZV axes in a Right-Hand Coordinate System. The particular IOD using the Volume Frame of Reference may​ constrainthealignmentofframeswithrespecttotheaxesoftheVolumeFrameofReference.Forexample,FigureC.8.24.2-1illustrates​ the use of the Volume Frame of Reference with frames whose rows are parallel to the XV axis and columns are parallel to the YV​ axis and whose origins lie on the ZV axis.​

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DICOM PS3.3 2020a - Information Object Definitions​

Page 1129​

Frame Origin (0,0)

Xi

 

 

 

Zv

 

Volume Origin

Yi

 

 

 

(0,0,0)

Xv

 

Yv

 

 

Figure C.8.24.2-1. Volume Frame of Reference​

C.8.24.2.1.2 Transducer Frame of Reference​

The Transducer Frame of Reference is a Right-hand Coordinate System consisting XX, YX, and ZX axes originating at a reference​ "Transducer Origin" defined as the geometric center of the transducer face.​

TheorientationoftheTransducerFrameofReferencerelativetotheVolumeOriginissuchthattheYX axisisnormaltothetransducer​ faceandthe"directionreference"(i.e.,transducertactilemarkerorzeroreference)isalignedwiththepositiveXX axis.Atransformation​ is specified between the Volume Frame of Reference and the Transducer Frame of Reference to define the position of the transducer​ relative to the volume. This transformation is specified by the Volume to Transducer Mapping Matrix (0020,9309).​

The Transducer Frame of Reference recognizes two types of scan geometry: 1) a scan geometry with a real apex such as would be​ the case for a pyramid, toroid or rotational volume acquisition, or 2) a scan geometry for which there is no specific apex. The point​ (xA, yA, zA) is the apex (or phase center) of the acquisition volume geometry in the Volume Frame of Reference. The apex (xA, yA,​ zA) may be located in the volume or exterior to it.​

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DICOM PS3.3 2020a - Information Object Definitions​

Apex (Xa,Ya,Za)

Zx

Transducer Origin (0,0,0)

Xx

 

Yx

Frame Origin (0,0)

Xi

 

Zv

 

Yi

 

Volume Origin (0,0,0)

 

Xv

 

Yv

 

Figure C.8.24.2-2. Transducer Frame of Reference​

Insomeacquisitionmodalities,thetransducerpositionand/ororientationchangesduringacquisitionandasingletransducermapping​ matrix is insufficient to describe the relationship between transducer and volume. In this case, Volume to Transducer Relationship​ (0020,930B)isrequiredandspecifiesthenatureoftherelationshipTransducerFrameofReferenceandtheVolumeFrameofReference.​

C.8.24.2.1.3 Table Frame of Reference​

There also may exist a fixed equipment reference called the Table Frame of Reference, a Right-hand Coordinate System consisting​ of XT, YT, and ZT axes originating at a reference "Table Origin". See Figure C.8.24.2-3.​

Note​

In this context the Table Frame of Reference refers to a fixed coordinate system in space that may be provided by a variety​ of source devices such as coordinates from a magnetic position sensor, LED sensor array, a physical scanner gantry, or​ similar device.​

A transformation may be specified between the Volume Frame of Reference and the Table Frame of Reference to define the position​ and orientation of the volume relative to this external Frame of Reference. This transformation is specified by the Volume to Table​ Mapping Matrix (0020,930A).​

- Standard -​

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