DICOM PS3.3 2021b - Information Object Definitions

C.34.18 Performed XA Reconstruction Module (Current)
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### C.34.18 Performed XA Reconstruction Module

This Module contains reconstruction parameter values for a performed XA imaging procedure.

This Module contains Attributes that reflect machine behavior but not those that are merely descriptive. The latter may be found in the reconstructed images.

### Note

Although the protocol elements are performed in the order of their Protocol Element Number (0018,9921), the order in which the attributes inside an item in the Reconstruction Protocol Element Sequence (0018,9934) is not encoded here but rather is determined by the processing pipeline of the specific device.

The XA Reconstruction Protocol includes 2D and 3D processing parameters. Some parameters are applicable to both 2D and 3D processing while other parameters are only applicable to 3D processing (e.g. slice thickness).

Table C.34.18-1. Performed XA Reconstruction Module Attributes

Attribute Name | Tag | Type | Attribute Description
--- | --- | --- | ---
Reconstruction Protocol Element Sequence | (0018,9934) | 1 | Parameter values for each reconstruction protocol element in the Protocol. Elements are performed in the order of their Protocol Element Number (0018,9921). One or more Items shall be included in this Sequence.
>Include Table 10.28-1 “Protocol Element Identification Macro Attributes” |
>Include Table 10.41-1 “General Procedure Protocol Reference Macro Attributes” |
>Source Acquisition Protocol Element Number | (0018,9938) | 1 | A value corresponding to the Protocol Element Number (0018,9921) of the Acquisition Protocol Element from this Protocol being reconstructed in this reconstruction protocol element. This may be multivalued if multiple acquisitions are combined in a single reconstruction protocol element.
>Source Acquisition Beam Number | (0018,9939) | 1 | One or more values corresponding to the Beam Number (300A,00C0) in the Acquisition Protocol Element (specified in Source Acquisition Protocol Element Number (0018,9938)) from which data was used in this reconstruction protocol element.
>Referenced SOP Class UID | (0008,1150) | 1C | Uniquely identifies the referenced SOP Class. Required if the referenced acquisition protocol element is not in this instance. Shall have a value of 1.2.840.10008.5.1.4.1.1.200.8 (XA Performed Procedure Protocol Storage)
>Referenced SOP Instance UID | (0008,1155) | 1C | The UID of the instance containing the acquisition protocol element referenced in Source Acquisition Protocol Element Number (0018,9938). Required if the referenced acquisition protocol element is not in this instance.
>Reconstruction Pipeline Type | (0018,11BE) | 1 | Specifies the type of pipeline of the reconstruction. See Section C.34.18.1. Enumerated Values: 2D 3D
>Window Width | (0028,1050) | 3 | Preferred value for Window Center (0028,1050) in the image instances produced by this reconstruction protocol element.
>Window Center | (0028,1051) | 3 | Preferred value for Window Width (0028,1051) in the image instances produced by this reconstruction protocol element.
>Image Filter Details Sequence | (0018,11BF) | 3 | Description of image filters applied to the reconstructed image. The filters are applied in the order of the sequence items. One or more Items are permitted in this Sequence.
>>Image Filter | (0018,9320) | 1 | A label identifying the filter applied to the reconstructed image.
>>Image Filter Description | (0018,9941) | 3 | A description of the nature or effect of the Image Filter (0018,9320). E.g., sharpening, noise removing, edge enhancing, metal artifact reduction.
>Applied Mask Subtraction Flag | (0018,11C0) | 3 | Identifies that a subtraction mask was applied. Enumerated Values: YES NO
>Mask Visibility Percentage | (0028,9478) | 3 | The percentage of visibility of the mask frame during the subtraction. A value of 0 corresponds to subtracted display, a value of 100 corresponds to un-subtracted display (native). See Section C.8.19.7.1.
>Rows | (0028,0010) | 3 | Number of rows in the reconstructed image.
>Columns | (0028,0011) | 3 | Number of columns in the reconstructed image.
>Image Rotation | (0070,0042) | 3 | Rotation of the image clockwise in degrees, before the Image Horizontal Flip (0070,0041) is applied. Enumerated Values: 270 180 90 0
>Image Horizontal Flip | (0070,0041) | 3 | Whether or not the image horizontal flip is applied after any Image Rotation has been applied such that the left side of the image becomes the right side. Enumerated Values: Y N
>Algorithm Type | (0018,9527) | 3 | Type of algorithm used to create the 3D reconstruction. Defined Terms: FILTER_BACK_PROJ ITERATIVE
>Convolution Kernel | (0018,1210) | 3 | A label describing the convolution kernel or algorithm used to perform 3D reconstruction of the data. A single value shall be present.
>Number Of Slices | (0054,0081) | 3 | Number of slices in the 3D reconstructed image.
>Slice Thickness | (0018,0050) | 3 | Nominal 3D reconstructed slice thickness, in mm.
>Spacing Between Slices | (0018,0088) | 3 | Spacing between 3D reconstructed slices, in mm. The spacing is measured from the center-to-center of each slice. ### Note Slice overlap may be constrained implicitly by constraining the Slice Thickness (0018,0050) and Spacing Between Slices (0018,0088). However, since each constraint is considered independently, the overlap may be any value resulting from the combination of allowable values for thickness and spacing.
>Reconstruction Field of View | (0018,9317) | 3 | The field of view width (x-dimension) followed by height (y-dimension) as used for 3D reconstruction in mm.
>Derivation Code Sequence | (0008,9215) | 3 | Additional processing applied to the reconstructed image after image filter (if any)
>>Include Table 8.8-1 “Code Sequence Macro Attributes” | No Baseline CID is defined.
>Requested Series Description | (0018,9937) | 3 | Text that is intended to be copied into the Series Description (0008,103E) of the images resulting from this Reconstruction Protocol Element.
>Requested Series Description Code Sequence | (0018,11C1) | 3 | A code that is intended to be copied into the Series Description Code Sequence (0008,103F) of the images resulting from this Reconstruction Protocol Element. Only a single Item is permitted in this Sequence
>>Include Table 8.8-1 “Code Sequence Macro Attributes” | No Baseline CID is defined.
>Content Qualification | (0018,9004) | 3 | Content Qualification Indicator of instances resulting from this Reconstruction Protocol Element. Enumerated Values: PRODUCT RESEARCH SERVICE See Section C.34.18.2.

#### C.34.18.1 Reconstruction Pipeline Type

Reconstruction Pipeline Type (0018,11BE) specifies the type of processing pipeline performed by the Reconstruction Protocol Element. XA processing pipelines can be categorized depending on the type of output data: 2D for the creation of 2D XA DERIVED Instances, and 3D for the creation of 3D XA Instances.

### Note

A 3D reconstruction element may also involve 2D reconstruction details in the pipeline.

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DICOM PS3.3 2021b - Information Object Definitions