Материал: part03

freedom.​

See Section C.29.1.4.1.2.​

Required if 3D Mating Point (0068,64C0) is present.​

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C.29.1.4.1 Generic Implant Template 2D Drawings Attribute Descriptions​

C.29.1.4.1.1 Mating Features​

These Attributes establish a Cartesian coordinate system relative to the Frame of Reference of the implant. When two implants are​ assembled using a pair of mating features, a rigid spatial registration can be established, that transforms one Frame of Reference so​ that the mating features align.​

C.29.1.4.1.2 Degrees of Freedom​

Mating Feature Degree of Freedom Sequence (0068,6400) is used to specify that a mating feature allows mating with another implant​ not only in one defined pose, but within a certain range of freedom. One Sequence Item specifies one degree of freedom that may​ be a rotation around or a translation along an arbitrary axis. The Degree of Freedom Type (0068,6420) specifies whether the degree​ of freedom describes a rotation or a translation.​

The 3D coordinates of the axis of translation or rotation is specified by 3D Degree Of Freedom Axis (0068,6490) with respect to the​ Implant Template's Frame of Reference as three-dimensional vector in x-y-z order. Range Of Freedom (0068,64A0) specifies an in-​ terval, in millimeters or degrees, by which this 3D coordinate system mating feature may be moved along or around the axis.​

For each HPGL Document, the 2D Degree Of Freedom Axis (0068,64F0) may be specified as a 3D vector encoded in x-y-z order,​ where the z-coordinate is equal to the direction of projection, i.e., equal to the cross product of the x- and y-axis of the printing space.​ Range Of Freedom (0068,64A0) specifies an interval, in millimeters or degrees, by which the 3D coordinate system of this mating​ feature may be moved along or around the axis.​

C.29.1.5 Generic Implant Template Planning Landmarks Module​

Table C.29.1.5-1 defines the general Attributes of the Generic Implant Template Planning Landmarks Module. This Module adds​ planning landmarks, i.e., geometric annotations that constrain implant template registration to anatomical features, to the Implant​ Template IOD.​

Note​

AnImplantTemplatemaycontain2Ddrawingsfromseveralviewpoints,3Dsurfacemodels,orboth.Theplanninglandmarks​ that are specified with this Module may occur in all of these, but may also only occur in some of these (due to their invisibility​ orirrelevanceinsomedrawingsorthe3Drepresentation).Each2Ddrawingspecifiesitsown2Ddrawingspace,whichrequires​ a separate geometric description for each drawing. The 3D models share one Frame of Reference. Thus, each landmark​ needs only one 3D representation that then applies to all 3D models contained in one Instance. The Attribute Descriptions​ oftheAttributesthatgeometricallydefinelandmarks(inTableC.29.1.5-2andTableC.29.1.5-3andTableC.29.1.5-4)contain​ complicated Conditions that express the following constraints:​

•​If 2D drawings are present in an Implant Template Instance, there may be 2D specifications of landmarks present in this​ Implant Template Instance.​

•​2DspecificationsoflandmarkswillrefertoHPGLDocumentNumbers(0068,62D0)thatarepresentinanImplantTemplate​ Instance.​

•​Landmarks are not required to be geometrically defined in all existing HPGL documents.​

•​If3DmodelsarepresentinaImplantTemplateInstance,theremaybe3DspecificationsoflandmarkspresentinthisImplant​ Template Instance​

•​2Dand3DspecificationsmaybepresentforonelandmarkinanInstanceifboth,2Ddrawingsand3Dmodelsarecontained​ in the Instance.​

Table C.29.1.5-1. Generic Implant Template Planning Landmarks Module Attributes​

Sequence​

One or more Items are permitted in this Sequence.​

>Include Table C.29.1.5-2 “Planning Landmark Point Macro Attributes”​

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C.29.1.5.1 Planning Landmark Macros​

Table C.29.1.5-2, Table C.29.1.5-3 and Table C.29.1.5-4 contain Macros for the definition of landmarks that can be used during​ planning to align an implant template with patient geometry.​

All Attributes within these Macros that contain 3D points or vectors are in x, y, z order. If multiple elements are encoded, the ordering​ is x1y1z, …, xnynzn, The points are in the coordinate system identified by the Frame of Reference UID 0020,0052.​

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DICOM PS3.3 2020a - Information Object Definitions​ Page 1519​

Table C.29.1.5-2. Planning Landmark Point Macro Attributes​

May be present if 2D Point Coordinates Sequence (0068,6550) is present​ and Implant Template 3D Model Surface Number (0068,6350) is present.​

Table C.29.1.5-3. Planning Landmark Line Macro Attributes​

May be present, if 2D Line Coordinates Sequence (0068,65A0) is present​ and Implant Template 3D Model Surface Number (0068,6350) is present.​

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Table C.29.1.5-4. Planning Landmark Plane Macro Attributes​

C.29.1.5.1.1 Planning Landmark Macros Attribute Descriptions​

C.29.1.5.1.1.1 2D Coordinates Sequences​

The 2D Point Coordinates Sequence (0068,6550) and 2D Line Coordinates Sequence (0068,65A0) contain the positions of point,​ line or plane landmarks in 2D templates. Each Sequence Item consists of a reference to one of the 2D templates and the point co-​ ordinates of the landmark with respect to that template. The Coordinates are with respect to the origin of the HPGL Document and​ are specified in Millimeters of the printing space.​

C.29.2 Implant Assembly Template​

This section describes the specific Modules for the Implant Assembly Template IOD. This IOD references Instances of the Implant​ Template IOD.​

C.29.2.1 Implant Assembly Template Module​

Table C.29.2-1 defines the general Attributes of the Implant Assembly Template Module.​

Table C.29.2-1. Implant Assembly Template Module Attributes​

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