A.8 Secondary Capture Image IOD
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## A.8 Secondary Capture Image IOD

The Secondary Capture (SC) Image Information Object Definition (IOD) specifies images that are converted from a non-DICOM format to a modality independent DICOM format.

Examples of types of equipment that create Secondary Capture Images include:

1. Video interfaces that convert an analog video signal into a digital image

2. Digital interfaces that are commonly used to transfer non-DICOM digital images from an imaging device to a laser printer

3. Film digitizers that convert an analog film image to digital data

4. Workstations that construct images that are sent out as a screen dump

5. Scanned documents and other bitmap images including hand-drawings

6. Synthesized images that are not modality-specific, such as cine-loops of 3D reconstructions

Originally, a single, relatively unconstrained, single-frame SC Image IOD was defined in the DICOM Standard. Though this IOD is retained and not retired since it is in common use, more specific IODs for particular categories of application are also defined.

The following IODs are all multi-frame. A single frame image is encoded as a multi-frame image with only one frame. The multi-frame SC IODs consist of:

- Multi-frame Single Bit Secondary Capture Image IOD

- Multi-frame Grayscale Byte Secondary Capture Image IOD

- Multi-frame Grayscale Word Secondary Capture Image IOD

- Multi-frame True Color Secondary Capture Image IOD

### A.8.1 SC Image Information Objection Definition

#### A.8.1.1 SC Image IOD Description

The Secondary Capture (SC) Image Information Object Definition (IOD) specifies single-frame images that are converted from a non-DICOM format to a modality independent DICOM format, without any constraints on pixel data format.

### Note

The use of this IOD is deprecated, and other more specific SC Image IODs should be used.

#### A.8.1.2 SC Image 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 Secondary Capture Image IOD. The Frame of Reference IE and Curve IE are not components of this IOD.

#### A.8.1.3 SC Image IOD Module Table

Table A.8-1. SC Image 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
Clinical Trial Series | C.7.3.2 | U
Equipment | General Equipment | C.7.5.1 | U
SC Equipment | C.8.6.1 | M
Image | General Image | C.7.6.1 | M
Image Pixel | C.7.6.3 | M
Device | C.7.6.12 | U
Specimen | C.7.6.22 | U
SC Image | C.8.6.2 | M
Overlay Plane | C.9.2 | U
Modality LUT | C.11.1 | U
VOI LUT | C.11.2 | U
ICC Profile | C.11.15 | U
SOP Common | C.12.1 | M
Common Instance Reference | C.12.2 | U

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