C.8.19.2 Enhanced XA/XRF Image Module
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#### C.8.19.2 Enhanced XA/XRF Image Module

This section describes the Enhanced XA/XRF Image Module. Table C.8.19.2-1 contains IOD Attributes that describe a XA/XRF Image by specializing Attributes of the General Image and Image Pixel Modules, and adding additional Attributes.

Table C.8.19.2-1. Enhanced XA/XRF Image Module Table

Attribute Name | Tag | Type | Attribute Description
--- | --- | --- | ---
Image Type | (0008,0008) | 1 | Image identification characteristics. See Section C.8.19.2.1.1 for specialization.
Planes in Acquisition | (0018,9410) | 1 | The multiplicity of planes used simultaneously during the acquisition. See Section C.8.19.2.1.3.
Plane Identification | (0018,9457) | 1C | Identification of the plane used to acquire this image. Defined Terms: MONOPLANE PLANE A PLANE B ### Note MONOPLANE may only be used for a single plane system PLANE A and PLANE B must be used for two plane systems, independent if the acquisition is single plane or biplane. The value has to be in accordance with the value of Planes in Acquisition (0018,9410). If this value is SINGLE PLANE all three Defined Term are applicable. Required if Planes in Acquisition (0018,9410) is not equal to UNDEFINED.
Acquisition Number | (0020,0012) | 3 | A number identifying the single continuous gathering of data over a period of time that resulted in this image.
Acquisition DateTime | (0008,002A) | 1 | The date and time that the acquisition of data that resulted in this image started. ### Note The synchronization of this time with an external clock is specified in the Synchronization Module in Acquisition Time Synchronized (0018,1800).
Bits Allocated | (0028,0100) | 1 | Number of bits allocated for each pixel 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 pixel sample. Each sample shall have the same number of bits stored. Enumerated Values: 8 9 10 11 12 13 14 15 16 See Section C.8.19.2.1.2 for specialization.
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.
Pixel Representation | (0028,0103) | 1 | Data representation of the pixel samples. Shall have the value: 0000H = Unsigned Integer.
Photometric Interpretation | (0028,0004) | 1 | Specifies the intended interpretation of the pixel data. Enumerated Values: MONOCHROME1 MONOCHROME2
Acquisition Protocol Name | (0018,9423) | 3 | User defined name of the protocol used to acquire this image.
Acquisition Protocol Description | (0018,9424) | 3 | User defined description of the protocol used to acquire this image.
Scan Options | (0018,0022) | 3 | Identifies any acquisition technique that was used during the acquisition of the image. Defined Terms: TOMO Tomography CHASE Bolus Chasing STEP Stepping ROTA Rotation
Content Qualification | (0018,9004) | 1 | Content Qualification Indicator Enumerated Values: PRODUCT RESEARCH SERVICE See Section C.8.13.2.1.1 for further explanation.
Patient Orientation Code Sequence | (0054,0410) | 1C | Sequence that describes the orientation of the patient with respect to gravity. See Section C.8.11.5.1.2 for further explanation. Only a single Item shall be included in this Sequence. Required if Positioner Type (0018,1508) equals CARM and C-arm Positioner Tabletop Relationship (0018,9474) equals YES. May be present otherwise.
>Include Table 8.8-1 “Code Sequence Macro Attributes” . | Baseline CID 19 “Patient Orientation”.
>Patient Orientation Modifier Code Sequence | (0054,0412) | 1C | Patient Orientation Modifier. Required if needed to fully specify the orientation of the patient with respect to gravity. Only a single Item shall be included in this Sequence.
>>Include Table 8.8-1 “Code Sequence Macro Attributes” | Baseline CID 20 “Patient Orientation Modifier”.
Patient Gantry Relationship Code Sequence | (0054,0414) | 2C | Sequence that describes the orientation of the patient with respect to the head of the table. See Section C.8.4.6.1.3 for further explanation. Zero or one item shall be included in this sequence. Required if Positioner Type (0018,1508) equals CARM and C-arm Positioner Tabletop Relationship (0018,9474) equals YES. May be present otherwise.
>Include Table 8.8-1 “Code Sequence Macro Attributes” . | Baseline CID 21 “Patient Equipment Relationship”.
Examined Body Thickness | (0010,9431) | 3 | Body thickness in mm at examination location perpendicular to the table top for this series. ### Note This is intended for estimation of the thickness of the patient at the tabletop, not for precise calculation of the size of the object in the X-Ray beam (see Calculated Anatomy Thickness (0018,9452) attribute). For example, used to estimate the value range of the Distance Object to Table Top (0018,9403) attribute.
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 Other Plane Sequence | (0008,9410) | 1C | The images of the corresponding plane for a Biplane acquisition device. Only a single Item shall be included in this Sequence. Required if Planes in Acquisition (0018,9410) is BIPLANE.
>Include Table 10-3 “Image SOP Instance Reference Macro Attributes” |
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” |
Source Image Evidence Sequence | (0008,9154) | 1C | Full set of Composite SOP Instances referred to inside the Source 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 Source Image Sequence (0008,2112) is present.
>Include Table C.17-3 “Hierarchical SOP Instance Reference Macro Attributes” |
Referenced Instance Sequence | (0008,114A) | 3 | Non-image Composite SOP Instances that are significantly related to this Image, including waveforms that may or may not be temporally synchronized with this image. One or more Items are permitted in this sequence.
>Include Table 10-11 “SOP Instance Reference Macro Attributes” |
>Purpose of Reference Code Sequence | (0040,A170) | 1 | Code describing the purpose of the reference to the SOP Instances. Only a single Item shall be included in this sequence.
>>Include Table 8.8-1 “Code Sequence Macro Attributes” | Defined CID 7004 “Waveform Purposes of Reference” for referenced waveforms.
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 - shall be used if Photometric Interpretation (0028,0004) is MONOCHROME2 INVERSE output after inversion is in P-Values - shall be used if Photometric Interpretation (0028,0004) is MONOCHROME1.

##### C.8.19.2.1 Enhanced XA/XRF Image Module Attribute Description

###### C.8.19.2.1.1 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.8.19.2.1.1.1 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.8.19.2.1.1.2 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.8.19.2.1.1.3 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.8.19.2.1.1.4 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.8.19.2.1.2 Bits Allocated and Bits Stored

Table C.8.19.2-2 specifies the allowed combinations of Bits Allocated (0028,0100) and Bits Stored (0028,0101).

Table C.8.19.2-2. Allowed Combinations of Attribute Values for Bits Allocated and Bits Stored

Bits Allocated | Bits Stored
--- | ---
8 | 8
16 | 9 to 16

###### C.8.19.2.1.3 Planes in Acquisition

The Planes in Acquisition (0018,9410) attribute identifies the multiplicity of planes used simultaneously during the acquisition.

Enumerated Values:

SINGLE PLANE

  Image is a single plane acquisition

BIPLANE

  Image is part of a Bi-plane acquisition

UNDEFINED

  Image is created by using data from one or two planes (e.g., reconstructed projection). May only be used when Image Type Value 1 equals DERIVED.

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