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: An Implant Template may contain 2D drawings from several viewpoints, 3D surface models, or both. The planning landmarks 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 or irrelevance in some drawings or the 3D representation). Each 2D drawing specifies its own 2D drawing space, which requires 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 of the Attributes that geometrically define landmarks (in Table C.29.1.5-2 – C.29.1.5-4) contain complicated Conditions that express the following constraints:

Table C.29.1.5-1 GENERIC IMPLANT TEMPLATE PLANNING LANDMARKS MODULE ATTRIBUTES

Attribute Name Tag Type Attribute Description
Planning Landmark Point Sequence (0068,6500) 3 Point landmarks for planning. One or more Items are permitted in this sequence.
>Include ‘Planning Landmark Point Macro’ Table C.29.1.5-2
>Planning Landmark ID (0068,6530) 1 Numeric ID of the planning landmark. Uniquely identifies a planning landmark within the SOP instance. The value shall start at 1, and increase monotonically by 1 for each Item.
>Planning Landmark Description (0068,6540) 3 Purpose or intended use of the landmark.
>Planning Landmark Identification Code Sequence (0068,6545) 2 Coded Description of the real-world point that is represented by the landmark. Zero or more Items shall be included in this sequence.
>>Include ‘Code Sequence Macro’ Table 8.8-1 Baseline Context ID is 7305
Planning Landmark Line Sequence (0068,6510) 3 Line landmarks for planning. One or more Items are permitted in this sequence.
>Include ‘Planning Landmark Line Macro’ Table C.29.1.5-3
>Planning Landmark ID (0068,6530) 1 Numeric ID of the planning landmark. Uniquely identifies the planning landmark within the SOP instance. The value shall start at 1, and increase monotonically by 1 for each Item.
>Planning Landmark Description (0068,6540) 3 Purpose or intended use of this landmark.
>Planning Landmark Identification Code Sequence (0068,6545) 2 Coded Description of the real-world line that is represented by this landmark. Zero or more Items shall be included in this sequence.
>>Include ‘Code Sequence Macro’ Table 8.8-1 Baseline Context ID is 7305
Planning Landmark Plane Sequence (0068,6520) 3 Plane landmarks for planning. One or more Items are permitted in this sequence.
>Include ‘Planning Landmark Plane Macro’ Table C.29.1.5-4
>Planning Landmark ID (0068,6530) 1 Numeric ID of the planning landmark. Uniquely identifies the planning landmark within the SOP instance. The value shall start at 1, and increase monotonically by 1 for each Item.
>Planning Landmark Description (0068,6540) 3 Purpose or intended use of the landmark.
>Planning Landmark Identification Code Sequence (0068,6545) 2 Coded Description of the real-world plane that is represented by this landmark. Zero or more Items shall be included in this sequence.
>>Include ‘Code Sequence Macro’ Table 8.8-1 Baseline Context ID is 7305

C.29.1.5.1 Planning Landmark Macros

Tables C.29.1.5-2 – 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 x 1 y 1 z, … , x n y n z n , The points are in the coordinate system identified by the Frame of Reference UID 0020,0052.

Table C.29.1.5-2 PLANNING LANDMARK POINT MACRO

Attribute Name Tag Type Attribute Description
2D Point Coordinates Sequence (0068,6550) 1C 2D coordinates of the point in the HPGL documents. One or more Items shall be included in this sequence. Required if 3D Point Coordinates (0068,6590) is not present and HPGL Document Sequence (0068,62C0) is present. May be present if 3D Point Coordinates (0068,6590) is present and HPGL Document Sequence (0068,62C0) is present.
>Referenced HPGL Document ID (0068,6440) 1 Value of the HPGL Document ID (0068,62D0) present in the HPGL Document Sequence (0068,62C0) that contains the 2D Drawing including the planning landmark. Shall be unique within the sequence.
>2D Point Coordinates (0068,6560) 1 Coordinates of the point in the HPGL document. Coordinates are measured in millimeters of the printing space. See C.29.1.2.1.1.
3D Point Coordinates (0068,6590) 1C 3D Coordinates of the point. Required if 2D Point Coordinates Sequence (0068,6550) is not present and Implant Template 3D Model Surface Number (0068,6350) is present. 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

Attribute Name Tag Type Attribute Description
2D Line Coordinates Sequence (0068,65A0) 1C 2D coordinates of the line in the HPGL documents. One or more Items shall be included in this sequence. Required if 3D Line Coordinates (0068,65D0) is not present and HPGL Document Sequence (0068,62C0) is present. May be present if 3D Line Coordinates (0068,65D0) is present and HPGL Document Sequence (0068,62C0) is present.
>Referenced HPGL Document ID (0068,6440) 1 Value of the HPGL Document ID (0068,62D0) present in the HPGL Document Sequence (0068,62C0) that contains the 2D Drawing including the planning landmark. Shall be unique within the sequence.
>2D Line Coordinates (0068,65B0) 1 Coordinates of the line in the HPGL document. Coordinates are measured in millimeters of the printing space. See C.29.1.2.1.1.
3D Line Coordinates (0068,65D0) 1C 3D Coordinates of the line. Required if 2D Line Coordinates Sequence (0068,65A0) is not present and Implant Template 3D Model Surface Number (0068,6350) is present. May be present, if 2D Line Coordinates Sequence (0068,65A0) is present and Implant Template 3D Model Surface Number (0068,6350) is present.

Table C.29.1.5-4 PLANNING LANDMARK PLANE MACRO

Attribute Name Tag Type Attribute Description
2D Plane Coordinates Sequence (0068,65E0) 1C 2D coordinates of the plane’s intersection with the HPGL documents. One or more Items shall be included in this sequence. Required if 3D Plane Origin (0068,6610) is not present and HPGL Document Sequence (0068,62C0) is present. May be present if 3D Plane Origin (0068,6610) is present and HPGL Document Sequence (0068,62C0) is present.
>Referenced HPGL Document ID (0068,6440) 1 Value of the HPGL Document ID (0068,62D0) present in the HPGL Document Sequence (0068,62C0) that contains the 2D Drawing including the planning landmark. Shall be unique within the sequence.
>2D Plane Intersection (0068,65F0) 1 2D Coordinates of the intersection of the plane with the projection plane. Coordinates are measured in Millimeters of the printing space. See C.29.1.2.1.1.
3D Plane Origin (0068,6610) 1C 3D Coordinates of the plane origin. Required if 2D Plane Coordinates Sequence (0068,65E0) is not present and Implant Template 3D Model Surface Number (0068,6350) is present. May be present if 2D Plane Coordinates Sequence (0068,65E0) is present and Implant Template 3D Model Surface Number (0068,6350) is present.
3D Plane Normal (0068,6620) 1C 3D Coordinates of the plane normal. Required if 3D Plane Origin (0068,6610) is present.

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 coordinates 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.