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

### A.8.2 Multi-frame Single Bit Secondary Capture Image IOD

#### A.8.2.1 Multi-frame Single Bit SC Image IOD Description

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

This IOD is typically used for scanned documents and bitmap images of hand drawings.

#### A.8.2.2 Multi-frame Single Bit 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 family of IODs. The Frame of Reference IE, Overlay IE, Modality LUT IE, VOI LUT IE and Curve IE are not components of this IOD.

#### A.8.2.3 Multi-frame Single Bit SC Image IOD Module Table

Table A.8-2. Multi-frame Single Bit 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
Cine | C.7.6.5 | C - Required if Frame Increment Pointer (0028,0009) is Frame Time (0018,1063) or Frame Time Vector (0018,1065)
Multi-frame | C.7.6.6 | M
Frame Pointers | C.7.6.9 | U
Device | C.7.6.12 | U
Specimen | C.7.6.22 | U
SC Image | C.8.6.2 | U
SC Multi-frame Image | C.8.6.3 | M
SC Multi-frame Vector | C.8.6.4 | C - Required if Number of Frames is greater than 1
SOP Common | C.12.1 | M
Common Instance Reference | C.12.2 | U
Frame Extraction | C.12.3 | C - Required if the SOP Instance was created in response to a Frame-Level retrieve request

#### A.8.2.4 Multi-frame Single Bit SC Image IOD Content Constraints

In the Image Pixel Module, the following constraints apply:

- Samples per Pixel (0028,0002) shall be 1

- Photometric Interpretation (0028,0004) shall be MONOCHROME2

- Bits Allocated (0028,0100) shall be 1

- Bits Stored (0028,0101) shall be 1

- High Bit (0028,0102) shall be 0

- Pixel Representation (0028,0103) shall be 0

- Planar Configuration (0028,0006) shall not be present

### Note

As a consequence of these attribute values, single bit pixels are packed eight to a byte as defined by the encoding rules in PS3.5.

The VOI LUT module shall not be present.

The Overlay module shall not be present.

### A.8.3 Multi-frame Grayscale Byte Secondary Capture Image IOD

#### A.8.3.1 Multi-frame Grayscale Byte Image IOD Description

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

This IOD is typically used for screen captured images for modalities that have pixel values of 8 bits, but may also be appropriate for scanned grayscale documents.

#### A.8.3.2 Multi-frame Grayscale Byte 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 family of IODs. The Frame of Reference IE, Overlay IE, Modality LUT IE and Curve IE are not components of this IOD.

#### A.8.3.3 Multi-frame Grayscale Byte SC Image IOD Module Table

Table A.8-3. Multi-frame Grayscale Byte 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
Frame of Reference | Frame of Reference | C.7.4.1 | C - Required if Pixel Measures or Plane Position (Patient) or Plane Orientation (Patient) Functional Group Macros Present
Synchronization | C.7.4.2 | U
Image | General Image | C.7.6.1 | M
Image Pixel | C.7.6.3 | M
Cine | C.7.6.5 | C - Required if Frame Increment Pointer (0028,0009) is Frame Time (0018,1063) or Frame Time Vector (0018,1065)
Multi-frame | C.7.6.6 | M
Frame Pointers | C.7.6.9 | U
Device | C.7.6.12 | U
Multi-frame Functional Groups | C.7.6.16 | U
Multi-frame Dimension | C.7.6.17 | U
Specimen | C.7.6.22 | U
SC Image | C.8.6.2 | U
SC Multi-frame Image | C.8.6.3 | M
SC Multi-frame Vector | C.8.6.4 | C - Required if Number of Frames is greater than 1
VOI LUT | C.11.2 | C - Required if the VOI LUT stage is not an identity transformation
SOP Common | C.12.1 | M
Common Instance Reference | C.12.2 | U
Frame Extraction | C.12.3 | C - Required if the SOP Instance was created in response to a Frame-Level retrieve request

#### A.8.3.4 Multi-frame Grayscale Byte SC Image IOD Content Constraints

The VOI LUT module is required if the VOI LUT stage is not an identity transformation. Support for both window and LUT is mandatory. The output grayscale space is defined to be in P-Values.

### Note

If the VOI LUT module is absent, then the stored pixel values are in P-Values.

In the Image Pixel Module, the following constraints apply:

- Samples per Pixel (0028,0002) shall be 1

- Photometric Interpretation (0028,0004) shall be MONOCHROME2

- Bits Allocated (0028,0100) shall be 8

- Bits Stored (0028,0101) shall be 8

- High Bit (0028,0102) shall be 7

- Pixel Representation (0028,0103) shall be 0

- Planar Configuration (0028,0006) shall not be present

- Rescale Intercept shall be 0

- Rescale Slope shall be 1

- Rescale Type shall be US

The Overlay module shall not be present.

#### A.8.3.5 Multi-frame Grayscale Byte SC Image Functional Group Macros

Table A.8-3b specifies the use of the Functional Group Macros used in the Multi-frame Functional Groups Module for the Multi-frame Grayscale Byte SC Image IOD.

Table A.8-3b. Multi-frame Grayscale Byte SC Image Functional Group Macros

Functional Group Macro | Section | Usage
--- | --- | ---
Pixel Measures | C.7.6.16.2.1 | C - Required if Plane Position (Patient) or Plane Orientation (Patient) Macros Present
Plane Position (Patient) | C.7.6.16.2.3 | C - Required if Pixel Measures or Plane Orientation (Patient) Macros Present
Plane Orientation (Patient) | C.7.6.16.2.4 | C - Required if Pixel Measures or Plane Position (Patient) Macros Present

### A.8.4 Multi-frame Grayscale Word Secondary Capture Image IOD

#### A.8.4.1 Multi-frame Grayscale Word SC Image IOD Description

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

This IOD is typically used for screen captured images for modalities that have pixel values greater than 8 bits.

#### A.8.4.2 Multi-frame Grayscale Word 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 family of IODs. The Frame of Reference IE, Overlay IE, Modality LUT IE and Curve IE are not components this IOD.

#### A.8.4.3 Multi-frame Grayscale Word SC Image IOD Module Table

Table A.8-4. Multi-frame Grayscale Word 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
Frame of Reference | Frame of Reference | C.7.4.1 | C - Required if Pixel Measures or Plane Position (Patient) or Plane Orientation (Patient) Functional Group Macros Present
Synchronization | C.7.4.2 | U
Image | General Image | C.7.6.1 | M
Image Pixel | C.7.6.3 | M
Cine | C.7.6.5 | C - Required if Frame Increment Pointer (0028,0009) is Frame Time (0018,1063) or Frame Time Vector (0018,1065)
Multi-frame | C.7.6.6 | M
Frame Pointers | C.7.6.9 | U
Device | C.7.6.12 | U
Multi-frame Functional Groups | C.7.6.16 | U
Multi-frame Dimension | C.7.6.17 | U
Specimen | C.7.6.22 | U
SC Image | C.8.6.2 | U
SC Multi-frame Image | C.8.6.3 | M
SC Multi-frame Vector | C.8.6.4 | C - Required if Number of Frames is greater than 1
VOI LUT | C.11.2 | C - Required if the VOI LUT stage is not an identity transformation
SOP Common | C.12.1 | M
Common Instance Reference | C.12.2 | U
Frame Extraction | C.12.3 | C - Required if the SOP Instance was created in response to a Frame-Level retrieve request

#### A.8.4.4 Multi-frame Grayscale Word SC Image IOD Content Constraints

The VOI LUT module is required if the VOI LUT stage is not an identity transformation. Support for both window and LUT is mandatory. The output grayscale space is defined to be in P-Values.

### Note

If the VOI LUT module is absent, then the stored pixel values are in P-Values.

In the Image Pixel Module, the following constraints apply:

- Samples per Pixel (0028,0002) shall be 1

- Photometric Interpretation (0028,0004) shall be MONOCHROME2

- Bits Allocated (0028,0100) shall be 16

- Bits Stored (0028,0101) shall be greater than or equal to 9 and less than or equal to 16

- High Bit (0028,0102) shall be one less than Bits Stored (0028,0101)

- Pixel Representation (0028,0103) shall be 0

- Planar Configuration (0028,0006) shall not be present

### Note

Rescale Slope and Rescale Intercept are not constrained in this IOD to any particular values. E.g., they may be used to recover floating point values scaled to the integer range of the stored pixel values, Rescale Slope may be less than one, e.g., a Rescale Slope of 1.0/65535 would allow represent floating point values from 0 to 1.0.

The Overlay module shall not be present. Unused high bits shall be filled with zeroes.

#### A.8.4.5 Multi-frame Grayscale Word SC Image Functional Group Macros

Table A.8-4b specifies the use of the Functional Group Macros used in the Multi-frame Functional Groups Module for the Multi-frame Grayscale Word SC Image IOD.

Table A.8-4b. Multi-frame Grayscale Word SC Image Functional Group Macros

Functional Group Macro | Section | Usage
--- | --- | ---
Pixel Measures | C.7.6.16.2.1 | C - Required if Plane Position (Patient) or Plane Orientation (Patient) Macros Present
Plane Position (Patient) | C.7.6.16.2.3 | C - Required if Pixel Measures or Plane Orientation (Patient) Macros Present
Plane Orientation (Patient) | C.7.6.16.2.4 | C - Required if Pixel Measures or Plane Position (Patient) Macros Present

### A.8.5 Multi-frame True Color Secondary Capture Image IOD

#### A.8.5.1 Multi-frame True Color Image IOD Description

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

This IOD is typically used for screen captured or synthetic images where true color is used, but may also be appropriate for scanned color documents.

#### A.8.5.2 Multi-frame True Color 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 family of IODs. The Frame of Reference IE, Overlay IE, Modality LUT IE, VOI LUT IE and Curve IE are not components of the this IOD.

#### A.8.5.3 Multi-frame True Color SC Image IOD Module Table

Table A.8-5. Multi-frame True Color 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
Frame of Reference | Frame of Reference | C.7.4.1 | C - Required if Pixel Measures or Plane Position (Patient) or Plane Orientation (Patient) Functional Group Macros Present
Synchronization | C.7.4.2 | 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
Cine | C.7.6.5 | C - Required if Frame Increment Pointer (0028,0009) is Frame Time (0018,1063) or Frame Time Vector (0018,1065)
Multi-frame | C.7.6.6 | M
Frame Pointers | C.7.6.9 | U
Device | C.7.6.12 | U
Multi-frame Functional Groups | C.7.6.16 | U
Multi-frame Dimension | C.7.6.17 | U
Specimen | C.7.6.22 | U
SC Image | C.8.6.2 | U
SC Multi-frame Image | C.8.6.3 | M
SC Multi-frame Vector | C.8.6.4 | C - Required if Number of Frames is greater than 1
ICC Profile | C.11.15 | U
SOP Common | C.12.1 | M
Common Instance Reference | C.12.2 | U
Frame Extraction | C.12.3 | C - Required if the SOP Instance was created in response to a Frame-Level retrieve request

#### A.8.5.4 Multi-frame True Color SC Image IOD Content Constraints

The VOI LUT module shall not be present.

In the Image Pixel Module, the following constraints apply:

- Samples per Pixel (0028,0002) shall be 3

- Photometric Interpretation (0028,0004) shall be RGB for uncompressed or lossless compressed transfer syntaxes that do not involve color space transformations, YBR_ICT for irreversible JPEG 2000 transfer syntaxes, YBR_RCT for reversible JPEG 2000 transfer syntaxes, YBR_PARTIAL_420 for MPEG2 and MPEG-4 AVC/H.264 transfer syntaxes and YBR_FULL_422 for other lossy compressed transfer syntaxes

  ### Note

  Future lossless and lossy transfer syntaxes may lead to the need for new definitions and choices for Photometric Interpretation.

- Bits Allocated (0028,0100) shall be 8

- Bits Stored (0028,0101) shall be 8

- High Bit (0028,0102) shall be 7

- Pixel Representation (0028,0103) shall be 0

- Planar Configuration (0028,0006) shall be 0 (color-by-pixel) if Photometric Interpretation (0028,0004) is RGB

Planar Configuration (0028,0006) shall be 0 (color-by-pixel) if Photometric Interpretation (0028,0004) is RGB

The Overlay module shall not be present.

#### A.8.5.5 Multi-frame True Color SC Image Functional Group Macros

Table A.8-5b specifies the use of the Functional Group Macros used in the Multi-frame Functional Groups Module for the Multi-frame True Color SC Image IOD.

Table A.8-5b. Multi-frame True Color SC Image Functional Group Macros

Functional Group Macro | Section | Usage
--- | --- | ---
Pixel Measures | C.7.6.16.2.1 | C - Required if Plane Position (Patient) or Plane Orientation (Patient) Macros Present
Plane Position (Patient) | C.7.6.16.2.3 | C - Required if Pixel Measures or Plane Orientation (Patient) Macros Present
Plane Orientation (Patient) | C.7.6.16.2.4 | C - Required if Pixel Measures or Plane Position (Patient) Macros Present

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