A.21 Positron Emission Tomography Image IOD
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## A.21 Positron Emission Tomography Image IOD

### A.21.1 PET Image IOD Description

The Positron Emission Tomography (PET) Image Information Object Definition specifies an image that has been created by a Positron Tomograph imaging device, including dedicated PET cameras and Nuclear Medicine imaging devices operating in coincidence mode. This includes data created by external detection devices that create images of the distribution of administered radioactive materials, specifically positron emitters, in the body. Depending on the specific radiopharmaceuticals administered and the particular imaging procedure performed, problems involving changes in metabolism, function, or physiology can be investigated and various region pathologies can be studied. For these problems, quantitation of image data in absolute activity and physiological units is important. In addition, the PET Image IOD specifies attenuation (transmission) images used for correction and anatomical reference of emission images.

### A.21.2 PET 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 PET Image IOD. The overlay IE, modality LUT IE, VOI LUT IE, and curve IE are not components of the PET Image IOD.

### A.21.3 PET Image IOD Module Table

Table A.21.3-1. PET 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
PET Series | C.8.9.1 | M
PET Isotope | C.8.9.2 | M
PET Multi-gated Acquisition | C.8.9.3 | C - Required if Series Type (0054,1000) Value 1 is GATED.
NM/PET Patient Orientation | C.8.4.6 | M
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
Image | General Image | C.7.6.1 | M
Image Plane | C.7.6.2 | M
Image Pixel | C.7.6.3 | M
Device | C.7.6.12 | U
Specimen | C.7.6.22 | U
PET Image | C.8.9.4 | M
Overlay Plane | C.9.2 | U
VOI LUT | C.11.2 | U
Acquisition Context | C.7.6.14 | U
SOP Common | C.12.1 | M
Common Instance Reference | C.12.2 | U

#### A.21.3.1 Acquisition Context Module

The Defined TID for Acquisition Context Sequence (0040,0555) is TID 3470 “NM/PET Acquisition Context”, which includes description of the cardiovascular rest or stress state, and the blood glucose measurement.

The Acquisition Context information may be entered during acquisition, or obtained from the Modality Worklist using information supplied in the Protocol Context, using TID 15101 “NM/PET Protocol Context”.

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