A.39 Spatial Registration Information Object Definitions
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## A.39 Spatial Registration Information Object Definitions

### A.39.1 Spatial Registration IOD

#### A.39.1.1 Spatial Registration IOD Description

The Registration IOD specifies the spatial relationship between Frames of Reference.

#### A.39.1.2 Spatial Registration IOD Entity-Relationship Model

Figure A.39-1. Spatial Registration Information Object Definition E-R Model

#### A.39.1.3 Spatial Registration IOD Module Table

Table A.39.1-1. Spatial Registration 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
Spatial Registration Series | C.20.1 | M
Frame of Reference | Frame of Reference | C.7.4.1 | M
Equipment | General Equipment | C.7.5.1 | M
Spatial Registration | Spatial Registration | C.20.2 | M
Common Instance Reference | C.12.2 | M
SOP Common | C.12.1 | M

### Note

The Specimen Identification Module was previously included in this IOD but has been retired. See PS3.3-2008.

### A.39.2 Deformable Spatial Registration IOD

#### A.39.2.1 Deformable Spatial Registration IOD Description

The Deformable Spatial Registration Information Object Definition (IOD) describes spatial relationships between images in one or more frames of reference via deformation grids and transformation matrices. The deformations and transformations describe to an application how to sample data from one or more Source RCS into the Registered RCS.

The Registered RCS is the Frame of Reference specified within an instance of this IOD. The IOD may specify that only a subset of the entire Source RCS Frame of Reference is affected by the transformation, by specifying specific frames of image SOP Instances that use the Source Frame of Reference.

The deformation is described as a grid of offset vectors. Each grid element contains 3 values representing offset distances in the X, Y, and Z directions at the center position of the deformation grid element. The relationship between the data being deformed and the deformation grid is purely spatial. Therefore the resolution of the grid is independent of the data being deformed.

#### A.39.2.2 Deformable Spatial Registration IOD Entity-Relationship Model

The E-R Model for the Deformable Spatial Registration IOD is identical to the E-R Model for the Spatial Registration IOD in Figure A.39-1.

#### A.39.2.3 Deformable Spatial Registration IOD Module Table

Table A.39.2-1. Deformable Spatial Registration 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
Spatial Registration Series | C.20.1 | M
Frame of Reference | Frame of Reference | C.7.4.1 | M
Equipment | General Equipment | C.7.5.1 | M
Enhanced General Equipment | C.7.5.2 | M
Spatial Registration | Deformable Spatial Registration | C.20.3 | M
Common Instance Reference | C.12.2 | M
SOP Common | C.12.1 | M

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