DICOM PS3.3 2021b - Information Object Definitions

A.38 Enhanced Computed Tomography Image IOD (Current)
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## A.38 Enhanced Computed Tomography Image IOD

### A.38.1 Enhanced CT Image IOD

#### A.38.1.1 Enhanced CT Image IOD Description

The Enhanced Computed Tomography (CT) Image Information Object Definition (IOD) specifies an image that has been created by a computed tomography imaging device.

#### A.38.1.2 Enhanced CT 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.

#### A.38.1.3 Enhanced CT Image IOD Module Table

Table A.38-1 specifies the Modules of the Enhanced CT Image IOD.

Table A.38-1. Enhanced CT 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
CT Series | C.8.15.1 | M
Clinical Trial Series | C.7.3.2 | U
Frame of Reference | Frame of Reference | C.7.4.1 | M
Synchronization | C.7.4.2 | C - Required if time synchronization was applied.
Equipment | General Equipment | C.7.5.1 | M
Enhanced General Equipment | C.7.5.2 | M
Image | Image Pixel | C.7.6.3 | M
Enhanced Contrast/Bolus | C.7.6.4b | C - Required if contrast media was applied.
Multi-frame Functional Groups | C.7.6.16 | M
Multi-frame Dimension | C.7.6.17 | M
Cardiac Synchronization | C.7.6.18.1 | C - Required if cardiac synchronization was applied.
Respiratory Synchronization | C.7.6.18.2 | C - Required if respiratory synchronization was applied.
Supplemental Palette Color Lookup Table | C.7.6.19 | C - Required if Pixel Presentation (0008,9205) in the Enhanced CT Image Module equals COLOR or MIXED.
Acquisition Context | C.7.6.14 | M
Device | C.7.6.12 | U
Specimen | C.7.6.22 | U
Enhanced CT Image | C.8.15.2 | M
Enhanced Multi-energy CT Acquisition | C.8.15.4 | C - Required if Multi-energy CT Acquisition (0018,9361) is YES.
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.38.1.3.1 Enhanced CT Image IOD Content Constraints

The General Image Module, Overlay Plane Module and VOI LUT Module shall not be used in a Standard Extended SOP Class of the Enhanced CT Image.

### Note

1. 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.

   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.

   Grayscale Softcopy Presentation State Storage Instances that are generated during acquisition may be referenced from the Image SOP Instance by using the Referenced Grayscale Presentation State Sequence in the Enhanced CT Image Module. See Section C.8.15.2.

2. The Curve Module (Retired) was previously include in the list of Modules that shall not be present, but has been retired from DICOM. It is still not permitted to be present. See PS3.3-2004.

3. The Specimen Identification Module was previously included in this IOD but has been retired, and its functionality replaced by the Specimen Module. See PS3.3-2008.

4. The Enhanced Contrast/Bolus Module will be present even if images are processed to remove contrast information from the pixels, e.g. Virtual Non-Contrast images.

#### A.38.1.4 Enhanced CT Image Functional Group Macros

Table A.38-2 specifies the use of the Functional Group Macros used in the Multi-frame Functional Groups Module for the Enhanced CT Image IOD.

Table A.38-2. Enhanced CT Image Functional Group Macros

Functional Group Macro | Section | Usage
--- | --- | ---
Pixel Measures | C.7.6.16.2.1 | M
Frame Content | C.7.6.16.2.2 | M - May not be used as a Shared Functional Group.
Plane Position (Patient) | C.7.6.16.2.3 | M
Plane Orientation (Patient) | C.7.6.16.2.4 | M
Referenced Image | C.7.6.16.2.5 | C - Required if the image or frame has been planned on another image or frame, may be present otherwise.
Derivation Image | C.7.6.16.2.6 | C - Required if the image or frame has been derived from another SOP Instance.
Cardiac Synchronization | C.7.6.16.2.7 | C - Required if Cardiac Synchronization Technique (0018,9037) equals other than NONE and if Image Type (0008,0008) Value 1 is ORIGINAL or MIXED. May be present otherwise.
Frame Anatomy | C.7.6.16.2.8 | M
Frame VOI LUT | C.7.6.16.2.10 | U
Real World Value Mapping | C.7.6.16.2.11 | C - Required if Multi-energy CT Acquisition (0018,9361) is YES. May be present otherwise.
Contrast/Bolus Usage | C.7.6.16.2.12 | C - Required if Contrast/Bolus Agent Sequence (0018,0012) is used.
Respiratory Synchronization | C.7.6.16.2.17 | C - Required if Respiratory Motion Compensation Technique (0018,9170) equals other than NONE, REALTIME or BREATH_HOLD and if Image Type (0008,0008) Value 1 is ORIGINAL or MIXED. May be present otherwise.
Irradiation Event Identification | C.7.6.16.2.18 | M
CT Image Frame Type | C.8.15.3.1 | M
CT Acquisition Type | C.8.15.3.2 | C - Required if Image Type (0008,0008) Value 1 is ORIGINAL or MIXED, may be present otherwise.
CT Acquisition Details | C.8.15.3.3 | C - Required if Image Type (0008,0008) Value 1 is ORIGINAL or MIXED, may be present otherwise.
CT Table Dynamics | C.8.15.3.4 | C - Required if Image Type (0008,0008) Value 1 is ORIGINAL or MIXED, may be present otherwise.
CT Position | C.8.15.3.5 | C - Required if Image Type (0008,0008) Value 1 is ORIGINAL or MIXED, may be present otherwise
CT Geometry | C.8.15.3.6 | C - Required if Image Type (0008,0008) Value 1 is ORIGINAL or MIXED, may be present otherwise.
CT Reconstruction | C.8.15.3.7 | C - Required if Image Type (0008,0008) Value 1 is ORIGINAL or MIXED and Acquisition Type (0018,9302) is other than CONSTANT_ANGLE, may be present otherwise.
CT Exposure | C.8.15.3.8 | C - Required if Image Type (0008,0008) Value 1 is ORIGINAL or MIXED, may be present otherwise.
CT X-Ray Details | C.8.15.3.9 | C - Required if Image Type (0008,0008) Value 1 is ORIGINAL or MIXED, may be present otherwise.
CT Pixel Value Transformation | C.8.15.3.10 | M
CT Additional X-Ray Source | C.8.15.3.11 | C - Required if the image is reconstructed from a system with multiple X-Ray sources and Multi-energy CT Acquisition (0018,9361) is NO or is absent.
Multi-energy CT Processing | C.8.15.3.13 | C - Required if the image pixel data contains the results of Multi-energy material processing.
Multi-energy CT Characteristics | C.8.15.3.12 | U
Temporal Position | C.7.6.16.2.23 | U

For Measurement Units Code Sequence (0040,08EA) in Real World Value Mapping Sequence (0040,9096) DCID 301 “Multi-energy Material Units” shall be used.

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DICOM PS3.3 2021b - Information Object Definitions