DICOM PS3.3 2019b - Information Object Definitions

A.85 Encapsulated 3D Manufacturing Model IODs (Current)
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## A.85 Encapsulated 3D Manufacturing Model IODs

### A.85.1 Encapsulated STL IOD

#### A.85.1.1 Encapsulated STL IOD Description

The Encapsulated STL Information Object Definition (IOD) describes a 3D model in Stereolithography (STL) format that has been encapsulated within a DICOM Information Object.

#### A.85.1.2 Encapsulated STL Entity-Relationship Model

This IOD uses the E-R Model in Section A.1.2, with only the Encapsulated Document IE below the Series IE.

#### A.85.1.3 Encapsulated STL IOD Module Table

Table A.85.1-1 specifies the Encapsulated STL IOD Modules.

Table A.85.1-1. Encapsulated STL 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 | Encapsulated Document Series | C.24.1 | 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
Encapsulated Document | Encapsulated Document | C.24.2 | M
Manufacturing 3D Model | C.35.1 | M
SOP Common | C.12.1 | M
Common Instance Reference | C.12.2 | C - Required if other instances are referenced

### Note

The Specimen Identification Module was previously included in this IOD but has been retired. See PS3.3-2008.

#### A.85.1.4 Encapsulated STL IOD Content Constraints

##### A.85.1.4.1 Encapsulated Document

The Encapsulated Document (0042,0011) Attribute shall contain a binary STL byte stream [STL 1989]. The encapsulated document may include negative vertex coordinates.

### Note

1. The original STL specification in 1989 required that all 3 vertex coordinates of each triangle be located in the positive quadrant. The creators of the standard (3D Systems) later relaxed this restriction and negative coordinates were allowed. It is common practice in medical usage for STL models to align with the coordinate system of the source DICOM data, which will often result in negative vertex coordinates.

2. The Frame Of Reference UID (0020,0052) is an identifier for the origin and axes implicit in the STL data.

##### A.85.1.4.2 MIME Type of Encapsulated Document

Enumerated Values:

model/stl

##### A.85.1.4.3 Modality

Enumerated Values:

M3D

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DICOM PS3.3 2019b - Information Object Definitions