This Section defines the Information Object for single plane X-Ray Angiographic Imaging that includes those data elements and information objects necessary for the interchange of digital X-Ray Angiographic data. This includes images of the heart and all blood vessels.
The XA IOD share a significant amount of common information with the XRF IOD. The differences between the two IODs are that the XRF Image IOD includes a tomography module; and the two IODs utilize different methods to specify positioner angles. The XRF Image IOD contains a single column angulation Data Element that uses an equipment based coordinate system, while XA Image IOD c-arm positioner angles are specified in a patient based coordinate system. RF applications that support a patient-based coordinate system with cranial/caudal, LAO/RAO angles may utilize the XA IOD.
The XA IOD is also applicable to clinical areas other than angiography (e.g. Interventional Procedures, Myelography, Biopsy/Localization, and Neurology).
Note: 1. For the purpose of X-Ray Angiography (XA), this IOD can be used to encode a single frame image, or a Cine Run encoded in a single multi-frame image.
2. A typical study might include all the images generated between the time a patient gets on and gets off the procedure table. As several separable diagnostic or therapeutic processes may occur during a single study (e.g., pre-intervention CA, left ventriculography, and post-intervention CA), a series may be defined as comprising a set of images (single or Multi-Frame) associated with one such process within a study.
3. This IOD can be used to encode a single plane acquisition, or one plane of a biplane acquisition.
The E-R Model in Section A.1.2 depicts those components of the DICOM Application Information Model that directly reference the X-Ray Angiographic Image IOD, with exception of the Frame of Reference and Modality LUT entities, which are not used. Additionally, "Image" in Figure A.1-1 may represent a Single Frame or a Multi-Frame image. A frame denotes a two-dimensional organization of pixels recorded as a single exposure.
Table A.14-1X-RAY ANGIOGRAPHIC IMAGE IOD MODULES
|Clinical Trial Subject||C.7.1.3||U|
|Clinical Trial Study||C.7.2.3||U|
|Clinical Trial Series||C.7.3.2||U|
|Frame of Reference||Synchronization||C.7.4.2||U|
|Contrast/Bolus||C.7.6.4||C - Required if contrast media was used in this Image|
|Cine||C.7.6.5||C - Required if pixel data is Multi-Frame Cine data|
|Multi-Frame||C.7.6.6||C - Required if pixel data is Multi-Frame Cine data|
|Mask||C.7.6.10||C - Required if the Image may be subtracted|
|X-Ray Table||C.8.7.4||C - Required if Image is created with table motion, may be present otherwise|
|Multi-Frame Overlay||C.9.3||C - Required if Overlay data contains multiple frames.|
|Modality LUT||C.11.1||C - Required if Pixel Intensity Relationship (0028,1040) is LOG U - Optional if Pixel Intensity Relationship (0028,1040) is DISP|
|Frame Extraction||C.12.3||C - Required if the SOP Instance was created in response to a Frame-Level retrieve request|
Note: The Curve Module was previously included in the Image IE for this IOD but has been retired. See PS 3.3 2004.