C.8.21 X-Ray 3D
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### C.8.21 X-Ray 3D

#### C.8.21.1 X-Ray 3D Image Module

This section describes the X-Ray 3D Image Module. Table C.8.21.1-1 contains IOD Attributes that describe a X-Ray 3D Image by specializing Attributes of the General Image and Image Pixel Modules, and adding additional Attributes.

Table C.8.21.1-1. X-Ray 3D Image Module Attributes

Attribute Name | Tag | Type | Attribute Description
--- | --- | --- | ---
Image Type | (0008,0008) | 1 | Image identification characteristics. See Section C.8.21.1.1.1 for specialization.
Include Table C.8-131 “Common CT/MR Image Description Macro Attributes” |
Bits Allocated | (0028,0100) | 1 | Number of bits allocated for each voxel sample. Each sample shall have the same number of bits allocated. Enumerated Values: 8 16
Bits Stored | (0028,0101) | 1 | Number of bits stored for each voxel sample. Each sample shall have the same number of bits stored. Enumerated Values: 8 9 10 11 12 13 14 15 16
High Bit | (0028,0102) | 1 | Most significant bit for pixel sample data. Each sample shall have the same high bit. Shall be one less than the value in Bits Stored (0028,0101).
Samples per Pixel | (0028,0002) | 1 | Number of samples (color planes) in this image shall have a value of 1.
Photometric Interpretation | (0028,0004) | 1 | Specifies the intended interpretation of the voxel data. Enumerated Values: MONOCHROME2
Content Qualification | (0018,9004) | 1 | Content Qualification Indicator Enumerated Values: PRODUCT RESEARCH SERVICE See Section C.8.13.2.1.1 for further explanation.
Burned In Annotation | (0028,0301) | 1 | Indicates whether or not the image contains sufficient burned in annotation to identify the patient and date the image was acquired. Enumerated Values: NO
Recognizable Visual Features | (0028,0302) | 3 | Indicates whether or not the image contains sufficiently recognizable visual features to allow the image or a reconstruction from a set of images to identify the patient. Enumerated Values: YES NO If this Attribute is absent, then the image may or may not contain recognizable visual features.
Lossy Image Compression | (0028,2110) | 1 | Specifies whether an Image has undergone lossy compression (at a point in its lifetime). Enumerated Values: 00 Image has NOT been subjected to lossy compression. 01 Image has been subjected to lossy compression. Once this value has been set to 01 it shall not be reset. See Section C.7.6.1.1.5.
Lossy Image Compression Ratio | (0028,2112) | 1C | Describes the approximate lossy compression ratio(s) that have been applied to this image. See Section C.7.6.1.1.5 for further explanation. May be multi-valued if successive lossy compression steps have been applied; the value order shall correspond to the values of Lossy Image Compression Method (0028,2114). ### Note For example, a compression ratio of 30:1 would be described in this Attribute with a single value of 30. For historical reasons, the lossy compression ratio may also be described in Derivation Description (0008,2111). Required if Lossy Image Compression (0028,2110) is "01".
Lossy Image Compression Method | (0028,2114) | 1C | A label for the lossy compression method(s) that have been applied to this image. See Section C.7.6.1.1.5 for further explanation. May be multi-valued if successive lossy compression steps have been applied; the value order shall correspond to the values of Lossy Image Compression Ratio (0028,2112). ### Note For historical reasons, the lossy compression method may also be described in Derivation Description (0008,2111). Required if Lossy Image Compression (0028,2110) is "01".
Referenced Image Evidence Sequence | (0008,9092) | 1C | Full set of Composite SOP Instances referred to inside the Referenced Image Sequences of this SOP Instance. See Section C.8.13.2.1.2 for further explanation. One or more Items shall be included in this sequence. Required if the Referenced Image Sequence (0008,1140) is present.
>Include Table C.17-3 “Hierarchical SOP Instance Reference Macro Attributes” |
Image Comments | (0020,4000) | 3 | User-defined comments about the image.
Quality Control Image | (0028,0300) | 3 | Indicates whether or not this image is a quality control or phantom image. Enumerated Values: YES NO If this Attribute is absent, then the image may or may not be a quality control or phantom image.
Icon Image Sequence | (0088,0200) | 3 | This icon image is representative of the Image. Only a single Item is permitted in this sequence.
>Include Table C.7-11b “Image Pixel Macro Attributes” | See Section C.7.6.1.1.6 for further explanation.
Presentation LUT Shape | (2050,0020) | 1 | Specifies a predefined identity transformation for the Presentation LUT such that the output of all grayscale transformations, if any, are defined to be in P-Values. Enumerated Values: IDENTITY output is in P-Values
Source Irradiation Event Sequence | (0008,3011) | 3 | The set of Irradiation Events that were produced in this acquisition context. See C.8.21.1.1.4. One or more Items shall be included in this Sequence.
>Irradiation Event UID | (0008,3010) | 1 | Unique identification of the irradiation event(s) associated with the acquisition of this image.

##### C.8.21.1.1 X-Ray 3D Image Module Attribute Description

###### C.8.21.1.1.1 Image Type and Frame Type

In addition to the requirements specified in Section C.8.16.1 Image Type, the following additional requirements and Defined Terms are specified.

###### C.8.21.1.1.1.1 Pixel Data Characteristics

Value 1 of Image Type (0008,0008) and Frame Type (0008,9007) is discussed in Section C.8.16.1.1. No additional requirements or Defined Terms.

###### C.8.21.1.1.1.2 Patient Examination Characteristics

Value 2 of Image Type (0008,0008) and Frame Type (0008,9007) is discussed in Section C.8.16.1.2. No additional requirements or Defined Terms.

###### C.8.21.1.1.1.3 Image Flavor

Value 3 of Image Type (0008,0008) and Frame Type (0008,9007) is discussed in Section C.8.16.1.3. No additional requirements or Defined Terms.

###### C.8.21.1.1.1.4 Derived Pixel Contrast

Value 4 of Image Type (0008,0008) and Frame Type (0008,9007) is discussed in Section C.8.16.1.4. The value shall be NONE.

###### C.8.21.1.1.2 Volumetric Properties Attribute

The value of Volumetric Properties (0008,9206) is discussed in Section C.8.16.2.1.2.

### Note

1. For regularly sampled tomosynthesis slices reconstructed from projection X-Ray data, a value of VOLUME or SAMPLED is appropriate.

2. For slabs constructed by averaging adjacent regularly sampled tomosynthesis slices to produce thicker slices, a value of SAMPLED is appropriate.

3. For mathematically generated 2D views (e.g., constructed as Maximum Intensity Projections) of regularly sampled tomosynthesis slices, a value of SAMPLED is appropriate.

###### C.8.21.1.1.3 Volume Based Calculation Technique Attribute

The value of Volume Based Calculation Technique (0008,9207) is discussed in Section C.8.16.2.1.3.

Table C.8.21.1.1.3-1 specifies the additional Defined Terms for the Volume Based Calculation Technique (0008,9207) attribute to those in Table C.8-134 in Section C.8.16.2.1.3.

Table C.8.21.1.1.3-1. Additional Volume Based Calculation Technique Attribute Values for X-Ray 3D

Defined Term Name | Defined Term Description
--- | ---
TOMOSYNTHESIS | Construction of tomographic slices or slabs from limited angle projection data.

### Note

1. For tomosynthesis slices or slabs reconstructed from projection X-Ray data, a value of TOMOSYNTHESIS is appropriate.

2. For mathematically generated 2D views constructed as Maximum Intensity Projections of tomosynthesis slices, a value of MAX_IP is appropriate.

###### C.8.21.1.1.4 Source Irradiation Event Sequence

The Source Irradiation Event Sequence (0008,3011) contains the Irradiation Event UIDs of all the original projection images that were used in the 3D reconstruction process of this X-Ray 3D Image, regardless whether the projection images are encoded as DICOM images or not. Therefore, it allows relating the reconstructed X-Ray 3D image to its contributing irradiation events contained in the Radiation Dose SR.

The equipment generating the projection images associates these images to one or more Irradiation Event UIDs. All these UIDs are then included in the Radiation Dose SR as well as in the appropriate projection DICOM images. An X-Ray 3D image reconstructed from a set of projection images will include those Irradiation Event UIDs of the images that participated to that 3D reconstruction. In case the projection images are not encoded as DICOM images, the X-Ray equipment is responsible for including the contributing Irradiation Event UIDs in any further X-Ray 3D image reconstructed on that equipment.

An X-Ray 3D image derived from one or more X-Ray 3D images will include in the derived image all the Irradiation Event UIDs of the source images.

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