A.16 X-RAY RF IMAGE INFORMATION OBJECT DEFINITION

A.16.1 XRF Image IOD Description

The focus for this X-Ray RF Image IOD (XRF IOD) is to address the requirements for image transfer found in general Radiofluoroscopic applications performed on a table with a column. For applications performed on X-Ray RF acquisition systems that support a patient based coordinate system with cranial/caudal, LAO/RAO angles, etc. the XA Image IOD may be used.

Note: An example of a case where the XA IOD may be preferred to the RF IOD are RF acquisition system equipped with an X-Ray source and an image Receptor positioned by what is generally called a c-arm (e.g. Interventional Procedures, Myelography, Biopsy, and Neurology).

This Section defines the Information Object for X-Ray Radiofluoroscopic Imaging that includes those data elements and information objects necessary for the interchange of digital X-Ray RF Image data. The XRF IOD is applicable to X-Ray acquisition systems equipped with an image receptor whose plane is parallel to the table plane where the patient is. This Table has in general the ability to be tilted. Furthermore the X-Ray source may be supported by a column that can be angulated to adjust the incidence of the X-Ray beam on the image receptor plan. An equipment based coordinated system is used to track these angles.

Notes: 1. For the purpose of X-Ray Radiofluoroscopy, 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, a series may be defined as comprising a set of images (single or Multi-Frame) associated with one such process within a study.

A.16.2 XRF Image IOD Entity-Relationship Model

The E-R Model in Section A.1.2 depicts those components of the DICOM Application Information Model that directly reference the X-Ray RF Image IOD, with exception of the Frame of Reference entity that is 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.

Note: When a Study (or Study Component) contains a number of Multi-frame images that do not need to be grouped under different Series, a single Series may be used with a series number containing an arbitrary value (e.g. 1).

A.16.3 XRF Image IOD Module Table

Table A.16-1 - XRF IMAGE IOD MODULES

IE Module Reference Usage
Patient Patient C.7.1.1 M
Clinical Trial Subject C.7.1.3 U
Study General Study C.7.2.1 M
Patient Study C.7.2.2 U
Clinical Trial Study C.7.2.3 U
Series General Series C.7.3.1 M
Clinical Trial Series C.7.3.2 U
Frame of Reference Synchronization C.7.4.2 U
Equipment General Equipment C.7.5.1 M
Image General Image C.7.6.1 M
Image Pixel C.7.6.3 M
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
Frame Pointers C.7.6.9 U
Mask C.7.6.10 C - Required if the Image may be subtracted
Display Shutter C.7.6.11 U
Device C.7.6.12 U
Intervention C.7.6.13 U
Specimen C.7.6.22 U
X-Ray Image C.8.7.1 M
X-Ray Acquisition C.8.7.2 M
X-Ray Collimator C.8.7.3 U
X-Ray Table C.8.7.4 U
XRF Positioner C.8.7.6 U
X-Ray Tomo Acquisition C.8.7.7 C - Required if Scan Option (0018,0022) is TOMO
DX Detector C.8.11.4 U
Overlay Plane C.9.2 U
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
VOI LUT C.11.2 U
SOP Common C.12.1 M
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.