A.66 Intravascular OCT IOD
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## A.66 Intravascular OCT IOD

This Section defines an Information Object to be used with Intravascular Optical Coherence Tomography imaging devices.

### A.66.1 Intravascular OCT Image IOD Description

The Intravascular Optical Coherence Tomography Image IOD specifies a multi-frame image acquired on an Intravascular Optical Coherence Tomography modality.

The Intravascular OCT Image IOD is used in two SOP Classes as defined in PS3.4 Storage Service Class, a SOP Class for storage of images intended for presentation, and a SOP Class for storage of images intended for further processing before presentation. These are distinguished by their SOP Class UID and by the Enumerated Value of the mandatory Attribute in the Intravascular OCT Series Module, Presentation Intent Type (0008,0068).

IVOCT stores frames of polar data arranged in a rectangular format when "FOR PROCESSING" is specified. The A-lines in a frame are arranged in row order, with the catheter optics toward the left of the image. A-lines are always stored from top to bottom, in order of acquisition. The A-lines are evenly spaced (in angles) to form a complete 360 degrees of acquisition.

Application entities creating IVOCT FOR PRESENTATION SOP instances shall apply all needed processing (e.g., Z offset and refractive index correction) to the IVOCT image for correct presentation.

### A.66.2 Intravascular OCT Image IOD Entity-Relationship Model

The E-R Model in Section A.1.2 depicts those components of the DICOM Information Model that are referenced by the Intravascular Optical Coherence Tomography Image IOD. Table A.66.3-1 specifies the Modules of the Intravascular Optical Coherence Tomography Image IOD.

### A.66.3 Intravascular OCT Image IOD Modules

Table A.66.3-1. Intravascular OCT 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
Intravascular OCT Series | C.8.27.1 | M
Frame of Reference | Frame of Reference | C.7.4.1 | M
Synchronization | C.7.4.2 | M
Equipment | General Equipment | C.7.5.1 | M
Enhanced General Equipment | C.7.5.2 | M
Image | Image Pixel | C.7.6.3 | M
Supplemental Palette Color Lookup Table | C.7.9 | C - Required if Pixel Presentation (0008,9205) in the IVOCT Image Module equals COLOR.
Enhanced Contrast/Bolus | C.7.6.4 | M
Multi-frame Functional Groups | C.7.6.16 | M
Multi-frame Dimension | C.7.6.17 | M
Device | C.7.6.12 | U
Acquisition Context | C.7.6.14 | M
Cardiac Synchronization | C.7.6.18.1 | C - Required if cardiac synchronization was used
Intravascular OCT Image | C.8.27.2 | M
Intravascular OCT Acquisition Parameters | C.8.27.3 | M
Intravascular OCT Processing Parameters | C.8.27.4 | C - Required if Presentation Intent Type (0008,0068) is FOR PROCESSING.
Intravascular Image Acquisition Parameters | C.8.27.5 | M
SOP Common | C.12.1 | M
Common Instance Reference | C.12.2 | M
Frame Extraction | C.12.3 | C - Required if the SOP Instance was created in response to a Frame-Level retrieve request

#### A.66.3.1 Intravascular OCT Image IOD Content Constraints

The following constraints on Image attributes take precedence over the descriptions given in the Module Attribute Tables.

##### A.66.3.1.1 Contrast/Bolus Agent Sequence

For Contrast/Bolus Agent Sequence (0018,0012), the Defined Context Group is 3850.

##### A.66.3.1.2 Prohibited Modules

The Overlay Plane Module and VOI LUT Module shall not be used in a Standard Extended SOP Class of the Intravascular Optical Coherence Tomography Image.

### Note

In order to annotate images, whether during acquisition or subsequently, SOP Instances of the Grayscale Softcopy Presentation State Storage or the Structured Report Storage SOP Classes that reference the image SOP Instance may be used.

Pseudo-color presentation information may be applied through the use of separate Pseudo-color Softcopy Presentation State SOP instances.

No standard mechanism is provided for inclusion of annotations within the image SOP Instance itself and implementers are discouraged from using private extensions to circumvent this restriction.

### A.66.4 Intravascular OCT Image Functional Group Macros

Table A.66.4.3-1 specifies the use of the Functional Group Macros used in the Multi-frame Functional Group Module for the Intravascular Optical Coherence Tomography Image IOD.

Table A.66.4.3-1. Intravascular OCT Functional Group Macros

Functional Group Macro | Section | Usage
--- | --- | ---
Pixel Measures | C.7.6.16.2.1 | C - Required if Presentation Intent Type (0008,0068) is FOR PRESENTATION.
Frame Content | C.7.6.16.2.2 | M - May not be used as a Shared Functional Group.
Derivation Image | C.7.6.16.2.6 | C - Required if the image or frame has been derived from another SOP Instance.
Frame Anatomy | C.7.6.16.2.8 | M
Cardiac Synchronization | C.7.6.16.2.7 | C - Required if Cardiac Synchronization Technique (0018,9037) equals other than NONE May be present otherwise.
Frame VOI LUT | C.7.6.16.2.10 | U
Pixel Intensity Relationship LUT | C.7.6.16.2.13 | C - Required if Pixel Intensity Relationship (0028,1040) equals LOG. May be present otherwise.
Intravascular OCT Frame Type | C.8.27.6.1 | M
Intravascular Frame Content | C.8.27.6.2 | C - Required if Intravascular Acquisition (0018,3100) equals MEASURED or Presentation Intent Type (0008,0068) equals FORPRESENTATION.
Intravascular OCT Frame Content | C.8.27.6.3 | C - Required if Presentation Intent Type (0008,0068) equals FOR PROCESSING.

#### A.66.4.1 Intravascular OCT Image Functional Group Macros Content Constraints

##### A.66.4.1.1 Frame Anatomy Functional Group Macro

The Defined CID for the Anatomic Region Sequence (0008,2218) shall be CID 3604 “Arterial Lesion Locations”. The Defined CID for the Anatomic Region Modifier Sequence (0008,2220) shall be CID 3019 “Cardiovascular Anatomic Location Modifiers”.

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