DICOM PS3.3 2024d - Information Object Definitions |
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This Section describes Modules used in one or more X-Ray IODs. These Modules contain Attributes that are specific to X-Ray images.
Table C.8-26. X-Ray Image Module Attributes
Required if Multi-frame Image. Contains the Data Element Tag of the Attribute that is used as the Frame increment in Multi-frame image pixel data (see Section C.7.6.6). |
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Specifies whether an Image has undergone lossy compression (at a point in its lifetime). Enumerated Values: Once this value has been set to "01" it shall not be reset. Required if Lossy Compression has been performed on the Image. May be present otherwise. |
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Image identification characteristics. See Section C.8.7.1.1.1 for specialization. |
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The relationship between the Pixel sample values and the X-Ray beam intensity. See Section C.8.7.1.1.2. |
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Number of samples (color planes) in this image shall have a value of 1. |
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Number of bits allocated for each pixel sample. See Section C.8.7.1.1.6. |
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Number of bits stored for each pixel sample. See Section C.8.7.1.1.7. |
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Most significant bit for pixel sample data. See Section C.8.7.1.1.8. |
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Parameters of scanning sequence. See Section C.8.7.1.1.4. |
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Include Table 10-7 “General Anatomy Optional Macro Attributes” |
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Marks the location(s) of the R Wave in the cardiac cycles by referencing frame numbers; frame numbers begin with 1. |
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Other images significantly related to this image. Shall be present if Image Type (0008,0008) Value 3 is BIPLANE A or BIPLANE B. May be present otherwise. One or more Items shall be included in this Sequence. See Section C.8.7.1.1.13. |
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>Include Table 10-3 “Image SOP Instance Reference Macro Attributes” |
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A text description of how this image was derived. See Section C.8.7.1.1.5 for further explanation. |
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Indicates any visual processing performed on the images prior to exchange. See Section C.8.7.1.1.3. |
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A multi-valued Attribute that contains a descriptive label for each of the image frames. The number of values shall equal the number of frames. |
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Contains the Data Element Tags of one or more Attributes that vary or increment for the frames of a multi-frame image. See Section C.8.7.1.1.12. Shall not be present if it would contain only one value and that value would be Frame Time (0018,1063) or Frame Time Vector (0018,1065). |
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Indicates whether a reference object (phantom) of known size is present in the image and was used for calibration. Device is identified using the Device Module. See Section C.7.6.12. |
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Include Table 10.41-1 “General Procedure Protocol Reference Macro Attributes” |
The Image Type Attribute identifies important image characteristics in a multiple valued Data Element. For X-Ray, Image Type is specialized as follows:
Value 1 shall identify the Pixel Data Characteristics in accordance with Section C.7.6.1.1.2
Value 2 shall identify the Patient Examination Characteristics in accordance with Section C.7.6.1.1.2
Value 3 shall identify the image set in terms of the imaging planes.
Pixel Intensity Relationship (0028,1040) shall identify the relationship of the pixel values to the X-Ray beam intensity.
Defined Terms:
Non-linear "Log Function"; A Modality LUT shall be included with the image to allow it to be scaled back to its proportional value to X-Ray beam intensity;
Ready to be displayed; A Modality LUT may be included with the image to allow it to be scaled back to its proportional value to X-Ray beam intensity. The Attribute Acquisition Device Processing Description may be used to provide some indication on the pre-processing performed to create the ready to be displayed image.
Acquisition Device Processing Description (0018,1400) provides some indication in human readable text of the digital processing on the images before exchange. Examples of this processing are: edge enhanced, subtracted, time filtered, gamma corrected, convolved (spatially filtered).
The Scan Options Attribute identifies any acquisition technique that was used during the acquisition of the image.
If an Image is identified to be a Derived image (see Section C.8.7.1.1.1), Derivation Description (0008,2111) is an optional and implementation specific text description of the way the image was derived from an original image. As applied to X-Ray images, it may be used to describe derivation operations such as edge enhancement, temporal filtering, digital subtraction, or other linear and non-linear transformations.
The synchronization of a multi-frame X-Ray image with a waveform (e.g., ECG, pressure, or respiration) encoded in a different SOP Instance is managed through the Attributes of the Synchronization Module (see Section C.7.4.2) of the Frame of Reference IE.
The use of a Curve IE within the X-Ray IODs was previously defined in DICOM (See PS3.3-2004). That use has been retired in favor of encoding waveform data in a separate IOD.
Frame Dimension Pointer (0028,000A) identifies Attributes that vary or increment with each frame, and are clinically significant for viewing or processing the image. This is intended for SOP Instances whose preferred clinical presentation is dependent on frame relationships other than simply time.
Defined Terms for multi-frame cine from the Cine Module (see Section C.7.6.5) are:
Defined Terms for rotational acquisition from the XA Positioner Module (see Section C.8.7.5) are:
Defined Terms for stepped acquisition from the X-Ray Table Module (see Section C.8.7.4) are:
Previous releases of the Standard did not include the optional Frame Dimension Pointer (0028,000A), but instead depended entirely on the mandatory Frame Increment Pointer (0028,0009), and envisaged that only time and no other dimension would relate frames. Image creators that add the Frame Dimension Pointer (0028,000A) must anticipate that many implementations will ignore or discard this Attribute when displaying or storing images and continue to assume that frames are temporally related.
Frame Time (0018,1063) or Frame Time Vector (0018,1065) will also be present and will contain appropriate values consistent with the times of acquisition of the frames.
When Image Type (0008,0008) Value 3 is BIPLANE A or BIPLANE B, Referenced Image Sequence (0008,1140) shall be used to identify the corresponding SOP Instance of the Biplane acquisition. In this case, either:
multiple Items may be present, each with the Purpose of Reference Code Sequence (0040,A170) present, and only the first Item having the Purpose of Reference value (121314, DCM, "Other image of biplane pair").
The Referenced Frame Number (0008,1160) Attribute shall not be present in the Item that references the corresponding SOP Instance of the Biplane acquisition.
DICOM PS3.3 2024d - Information Object Definitions |
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