Материал: part17

YY Compound and Combined Graphic​

Objects in Presentation States (Informative)​

Presentation States may contain Compound Graphics and combined graphic objects. Two illustrative examples are given in this in-​ formative annex to explain these two concepts.​

First, an example of a Compound Graphic is given, an AXIS object, and secondly an example of a combined graphic object is given,​ a distance line.​

TherenderedappearanceoftheCompoundGraphics(suchasillustratedinFigureYY-1)arerecommendationsandarenotmandatory.​ For example, the Compound Graphic 'AXIS' can look slightly different on different viewing workstations.​

YY.1 An Example of The Compound Graphic 'axis'​

The AXIS from Figure YY-1 is defined in the following Compound Graphic Sequence (0070,0209) (see the following Table YY-1). An​ AXIS object is typically used for measurement purposes.​

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Figure YY-1. Compound Graphic 'AXIS'​

Table YY-1. Graphic Annotation Module Attributes​

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The following table shows the simple graphic objects for an axis. The breakdown of the axis into simple graphics is up to the imple-​ mentation. The Compound Graphic Instance ID (0070,0226) is used to relate the compound and the simple representation. To keep​ the example short only the first major tick is shown.​

Table YY-2. Graphic Annotation Module Attributes​

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YY.2 An Example of Distance Line Defined As A Combined Graphic Object​

Now, a distance line is defined as a combined graphic object, i.e., grouping a text object with a polyline graphic object (see Figure YY-​ 2). Distance lines are typically used for measurements and for computing the grayscale values along this line to build up a profile​ curve.​

This simple example is intended to show how the Graphic Group ID (0070,0295) is used for grouping of graphic annotations.​

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Figure YY-2. Combined Graphic Object 'DistanceLine'​

Table YY-3. Graphic Group Module​

Table YY-4. Graphic Annotation Module Attributes​

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ZZ Implant Template Description​

ZZ.1 Implant Mating​

In this section, the usage of mating features for assembly of implants is declared.​

ZZ.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. The figure below gives a simple example in 2D how two implants (symbolized by two rectangles) are​ matched according to a mating feature pair. For each 2D and 3D template present, a set of coordinates is assigned to each Mating​ Feature Sequence Item.​

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Figure ZZ.1-1. Implant Template Mating (Example).​

ZZ.1.2 Mating Feature ID​

It is recommended to give Mating Features that are somehow related, the same Mating Feature ID (0068,63F0) in different implant​ templates. This may help applications to switch between components while keeping connections to other components. The Example​ in Figure ZZ.1-2 shows that the first and the last hole in the plates get the same Mating Feature ID in each Template.​

Figure ZZ.1-2. Implant Template Mating Feature IDs (Example)​

ZZ.1.3 Mating Feature Sets​

The Mating Features are organized in sets of alternative features: Only one feature of any set shall be used for assembly with other​ componentsinoneplan.Thisenablesthedefinitionofvariantsforonekindofcontactacomponentcanmakewhileensuringconsistent​ plans.​

An example for Mating Feature Sets is shown in Figure ZZ.1-3. A hip stem template shows a set of five mating features, drawn as​ circles on the tip of its cone. Different head components use different mating points, depending on the base radius of the conic intake​ on the head.​

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