DICOM PS3.3 2024c - Information Object Definitions

A.8 Secondary Capture Image IODs

The Secondary Capture Image IODs specify images that are converted from a non-DICOM format to a modality independent DICOM format.

Examples of types of equipment that create Secondary Capture (SC) 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 encoded 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 Secondary Capture Image IODs 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:

A.8.1 Secondary Capture Image IOD

A.8.1.1 Secondary Capture Image IOD Description

The Secondary Capture Image 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.

A.8.1.2 Secondary Capture Image IOD Entity-Relationship Model

This IOD uses the E-R Model in Section A.1.2, with only the Image IE below the Series IE. The Frame of Reference IE is not a component of this IOD.

A.8.1.3 Secondary Capture Image IOD Module Table

Table A.8-1 specifies the Modules of the Secondary Capture Image IOD.

Table A.8-1. Secondary Capture 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

Frame of Reference

Frame of Reference

C.7.4.1

C - Required if Image Position (Patient) (0020,0032) or Image Orientation (Patient) (0020,0037) are present. May be present otherwise.

Synchronization

C.7.4.2

U

Equipment

General Equipment

C.7.5.1

U

SC Equipment

C.8.6.1

M

Acquisition

General Acquisition

C.7.10.1

M

Image

General Image

C.7.6.1

M

General Reference

C.12.4

U

Image Plane

C.7.6.2

U

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


Note

If Image Position (Patient) (0020,0032) and Image Orientation (Patient) (0020,0037) (from the Image Plane Module) are present, then the values of Pixel Spacing (0028,0030) (from the Image Plane Module and the Basic Pixel Spacing Calibration Macro included from the SC Image Module) are intended to be used for 3D spatial computations, rather than any values of Nominal Scanned Pixel Spacing (0018,2010) (from the SC Image Module), which may also be present.

DICOM PS3.3 2024c - Information Object Definitions