A.57 Surface Segmentation IOD
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## A.57 Surface Segmentation IOD

### A.57.1 Surface Segmentation IOD Description

The Surface Segmentation Information Object Definition (IOD) specifies a polygonal representation of a three dimensional surface. A Surface Segmentation SOP Instance may reference an externally defined coordinate system via the Frame of Reference UID (0020,0052) or establish its own coordinate system.

The Surface Segmentation IOD does not include the full set of acquisition parameters of the referenced images, e.g., cardiac phase. An application rendering or processing the segmentation may need to access the referenced images for such information.

One Segmented Surface Instance can contain one or more surfaces. Each surface within a Segmented Surface IE is represented as a single object.

### A.57.2 Surface Segmentation IOD Entity-Relationship Model

The E-R Model in Section A.1.2 depicts those components of the DICOM Information Model that directly reference the Surface Segmentation IOD. The Surface Segmentation uses a polygonal surface mesh representation to define the contained surfaces.

### A.57.3 Surface Segmentation IOD Module Table

Table A.57-1. Surface Segmentation IOD Modules

IE | Module | Reference | Usage
--- | --- | --- | ---
Patient | Patient | C.7.1.1 | M
Clinical Trial Subject | C.7.1.3 | U
Study | General Study | C.7.2.1 | M
Patient Study | C.7.2.2 | U
Clinical Trial Study | C.7.2.3 | U
Series | General Series | C.7.3.1 | M
Segmentation Series | C.8.20.1 | M
Clinical Trial Series | C.7.3.2 | U
Frame of Reference | Frame of Reference | C.7.4.1 | M
Equipment | General Equipment | C.7.5.1 | M
Enhanced General Equipment | C.7.5.2 | M
Surface | Surface Segmentation | C.8.23.1 | M
Surface Mesh | C.27.1 | M
Common Instance Reference | C.12.2 | C - Required if the surface has been derived from another SOP Instance
SOP Common | C.12.1 | M

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