Материал: part03

The fiducial UID can be used to associate this set of graphics with​ other Content Items.​

C.18.9.1 3D Spatial Coordinates Macro Attribute Descriptions​

C.18.9.1.1 Graphic Data​

Graphic Data may be used to associate an anatomic or spatial Concept with a defined set of patient relative 3D locations in a defined​ Frame of Reference, independent of any image. Graphic Data may be defined explicitly as a single point (i.e., to denote the epicenter​ of an anatomic site or lesion) or more than one point (i.e., representing a set of points or an open or closed polygon).​

C.18.9.1.2 Graphic Type​

This Attribute defines the type of geometry of the region of interest.​

Enumerated Values:​

POINT​ a single location denoted by a single (x,y,z) triplet​

MULTIPOINT​multiple locations each denoted by an (x,y,z) triplet; the points need not be coplanar​

POLYLINE​ a series of connected line segments with ordered vertices denoted by (x,y,z) triplets; the points need not be coplanar​ POLYGON​ a series of connected line segments with ordered vertices denoted by (x,y,z) triplets, where the first and last vertices​

shall be the same forming a polygon; the points shall be coplanar​

ELLIPSE​ an ellipse defined by four (x,y,z) triplets, the first two triplets specifying the endpoints of the major axis and the second​ two triplets specifying the endpoints of the minor axis​

ELLIPSOID​ athree-dimensionalgeometricsurfacewhoseplanesectionsareeitherellipsesorcirclesandcontainsthreeintersecting​ orthogonal axes, "a", "b", and "c"; the ellipsoid is defined by six (x,y,z) triplets, the first and second triplets specifying​ the endpoints of axis "a", the third and fourth triplets specifying the endpoints of axis "b", and the fifth and sixth triplets​ specifying the endpoints of axis "c"​

Note​

1.​A circle is a special case of ELLIPSE where the major and minor axis points are equidistant from the center.​

2.​Coplanar is in the mathematical sense and is not necessarily related to a specific image instance.​

C.19 Raw Data Specific Modules​

The following Modules are used by the Raw Data IOD.​

C.19.1 Raw Data Module​

Table C.19-1 specifies the Attributes that describe a raw data stream.​

Table C.19-1. Raw Data Module Attributes​

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Include any Private Attributes that contain Raw Data information. See Section C.19.1.1 for further explanation.​

C.19.1.1 Raw Data​

The Raw Data stored with the Raw Data Module consists of one or more Private Attributes that are vendor specific. No rules are​ specified about the content and format of the raw data.​

C.20 Spatial Registration​

C.20.1 Spatial Registration Series Module​

Table C.20.1-1 defines the general Attributes of the Spatial Registration Series Module.​

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Page 1448​ DICOM PS3.3 2020a - Information Object Definitions​

Table C.20.1-1. Spatial Registration Series Module Attributes​

C.20.2 Spatial Registration Module​

Table C.20.2-1 defines the general Attributes of the Spatial Registration Module.​

Table C.20.2-1. Spatial Registration Module Attributes​

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One or more Items are permitted in this Sequence.​

>>Include Table 10-11 “SOP Instance Reference Macro Attributes”​Reference to the Spatial Fiducial SOP Instance identifying the​ Used Fiducial(s)​

One or more Items are permitted in this Sequence.​

>>Include Table 10-11 “SOP Instance Reference Macro Attributes”​Reference to the Segmentation or Surface Segmentation SOP​ Instance identifying the Used Segments.​

C.20.2.1 Registration Module Attribute Descriptions​

C.20.2.1.1 Frame of Reference Transformation Matrix​

The Frame of Reference Transformation Matrix (3006,00C6) AMB describes how to transform a point (Bx,By,Bz) with respect to RCSB​ into (Ax,Ay,Az) with respect to RCSA according to Equation C.20.2-1.​

TheMatrixRegistrationisexpressibleasmultiplematrices,eachinaseparateItemofMatrixSequence(0070,030A).EquationC.20.2-​ 2 specifies the order of the matrix multiplication where M1 , M2 and M3 are the first, second and third Items in the Sequence.​

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1

Registration often involves two or more RCS, each with a corresponding Frame of Reference Transformation Matrix. For example,​ another Frame of Reference Transformation Matrix AMC can describe how to transform a point ( Cx,Cy,Cz) with respect to RCS C​ into ( Ax,Ay,Az) with respect to RCSA. It is straightforward to find the Frame of Reference Transformation Matrix B M C that describes​ how to transform the point ( Cx,Cy,Cz) with respect to RCSC into the point ( Bx,By,Bz) with respect to RCSB. The solution is to invert​ AMB and multiply by AMC, as shown in Equation C.20.2-3.​

If two or more transformation matrices describe the relation between Patient coordinates and a device-centric Well-known Frame of​ Reference,anycalculationsassumingtransitivityviatheWell-knownFrameofReferencemustbeperformedwithgreatcaretoassure​ that both registrations reflect the same positioning of the patient with respect to the common Well-known Frame of Reference.​

C.20.2.1.2 Frame of Reference Transformation Matrix Type​

There are three types of Registration Matrices:​

RIGID: This is a registration involving only translations and rotations. Mathematically, the matrix is constrained to be orthonormal and​ describes six degrees of freedom: three translations, and three rotations.​

RIGID_SCALE: This is a registration involving only translations, rotations and scaling. Mathematically, the matrix is constrained to be​ orthogonal and describes nine degrees of freedom: three translations, three rotations and three scales. This type of transformation​ is sometimes used in atlas mapping.​

AFFINE: This is a registration involving translations, rotations, scaling and shearing. Mathematically, there are no constraints on the​ elementsoftheFrameofReferenceTransformationMatrixotherthanthatthelastrowshallbe(0,0,0,1)topreservethehomogeneous​ coordinates, so it conveys twelve degrees of freedom. This type of transformation is sometimes used in atlas mapping.​

See Annex P “Transforms and Mappings (Informative)” in PS3.17 for more detail.​

C.20.3 Deformable Spatial Registration Module​

Table C.20.3-1 defines the general Attributes of the Deformable Spatial Registration Module.​

Table C.20.3-1. Deformable Spatial Registration Module Attributes​

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