US Multi-frame ImageCIOD
Secondary Capture ImageCIOD
Multi-frame Single Bit SC ImageCIOD
Multi-frame Grayscale Byte SC ImageCIOD
Multi-frame Grayscale Word SC ImageCIOD
Multi-frame True Color SC ImageCIOD
X-Ray Angiographic ImageCIOD
X-Ray Radiofluoroscopic ImageCIOD
RT Structure SetCIOD
Digital X-Ray ImageCIOD
Digital Mammography X-Ray ImageCIOD
Digital Intra-Oral X-Ray ImageCIOD
RT Beams Treatment RecordCIOD
RT Brachy Treatment RecordCIOD
RT Treatment Summary RecordCIOD
VL Endoscopic ImageCIOD
VL Microscopic ImageCIOD
VL Slide-Coordinates Microscopic ImageCIOD
VL Photographic ImageCIOD
Video Endoscopic ImageCIOD
Video Microscopic ImageCIOD
Video Photographic ImageCIOD
VL Whole Slide Microscopy ImageCIOD
Real-Time Video Endoscopic ImageCIOD
Real-Time Video Photographic ImageCIOD
Grayscale Softcopy Presentation StateCIOD
Color Softcopy Presentation StateCIOD
Pseudo-Color Softcopy Presentation StateCIOD
Blending Softcopy Presentation StateCIOD
Basic Structured DisplayCIOD
XA/XRF Grayscale Softcopy Presentation StateCIOD
Advanced Blending Presentation StateCIOD
Basic Voice Audio WaveformCIOD
Ambulatory ECGCIOD
Hemodynamic WaveformCIOD
Basic Cardiac Electrophysiology WaveformCIOD
Arterial Pulse WaveformCIOD
Respiratory WaveformCIOD
General Audio WaveformCIOD
Real-Time Audio WaveformCIOD
Basic Text SRCIOD
Enhanced SRCIOD
Comprehensive SRCIOD
Key Object Selection DocumentCIOD
Mammography CAD SRCIOD
Procedure LogCIOD
X-Ray Radiation Dose SRCIOD
Spectacle Prescription ReportCIOD
Macular Grid Thickness and Volume ReportCIOD
Implantation Plan SR DocumentCIOD
Comprehensive 3D SRCIOD
Radiopharmaceutical Radiation Dose SRCIOD
Extensible SRCIOD
Acquisition Context SRCIOD
Simplified Adult Echo SRCIOD
Patient Radiation Dose Structured ReportCIOD
Planned Imaging Agent Administration SRCIOD
Performed Imaging Agent Administration SRCIOD
Rendition Selection DocumentCIOD
Enhanced MR ImageCIOD
MR SpectroscopyCIOD
Enhanced MR Color ImageCIOD
Raw DataCIOD
Enhanced CT ImageCIOD
Spatial RegistrationCIOD
Deformable Spatial RegistrationCIOD
Spatial FiducialsCIOD
Ophthalmic Photography 8 Bit ImageCIOD
Ophthalmic Photography 16 Bit ImageCIOD
Stereometric RelationshipCIOD
Hanging ProtocolCIOD
Encapsulated PDFCIOD
Encapsulated CDACIOD
Real World Value MappingCIOD
Enhanced XA ImageCIOD
PatientMModule - Patient
Clinical Trial SubjectUModule - Patient
General StudyMModule - Study
Patient StudyUModule - Study
Clinical Trial StudyUModule - Study
General SeriesMModule - Series
XA/XRF SeriesMModule - Series
Clinical Trial SeriesUModule - Series
Frame of ReferenceCModule - Frame of Reference
SynchronizationCModule - Frame of Reference
General EquipmentMModule - Equipment
Enhanced General EquipmentMModule - Equipment
Image PixelMModule - Image
Enhanced Contrast/BolusCModule - Image
MaskUModule - Image
DeviceUModule - Image
InterventionUModule - Image
Acquisition ContextMModule - Image
Multi-frame Functional GroupsMModule - Image
(0008,0023) Content Date1Date
(0008,0033) Content Time1Time
(0020,0013) Instance Number1Integer String
(0020,0242) SOP Instance UID of Concatenation Source1CUnique Identifier
(0020,9161) Concatenation UID1CUnique Identifier
(0020,9162) In-concatenation Number1CUnsigned Short
(0020,9163) In-concatenation Total Number3Unsigned Short
(0020,9228) Concatenation Frame Offset Number1CUnsigned Long
(0022,0028) Stereo Pairs Present3Code String
(0028,0008) Number of Frames1Integer String
(0028,6010) Representative Frame Number3Unsigned Short
(5200,9229) Shared Functional Groups Sequence1Sequence
(0008,1140) Referenced Image Sequence2Sequence
(0008,9124) Derivation Image Sequence2Sequence
(0018,9118) Cardiac Synchronization Sequence1Sequence
(0018,9341) Contrast/Bolus Usage Sequence1Sequence
(0018,9401) Projection Pixel Calibration Sequence1Sequence
(0018,9405) Positioner Position Sequence1Sequence
(0018,9406) Table Position Sequence1Sequence
(0018,9407) Collimator Shape Sequence1Sequence
(0018,9412) XA/XRF Frame Characteristics Sequence1Sequence
(0018,9417) Frame Acquisition Sequence1Sequence
(0018,9432) Field of View Sequence1Sequence
(0018,9434) Exposure Control Sensing Regions Sequence1Sequence
(0018,9451) Frame Detector Parameters Sequence1Sequence
(0018,9455) Calibration Sequence1Sequence
(0018,9456) Object Thickness Sequence1Sequence
(0018,9462) Isocenter Reference System Sequence1Sequence
(0018,9463) Positioner Isocenter Primary Angle1Single
(0018,9464) Positioner Isocenter Secondary Angle1Single
(0018,9465) Positioner Isocenter Detector Rotation Angle1Single
(0018,9466) Table X Position to Isocenter1Single
(0018,9467) Table Y Position to Isocenter1Single
(0018,9468) Table Z Position to Isocenter1Single
(0018,9469) Table Horizontal Rotation Angle1Single
(0018,9470) Table Head Tilt Angle1Single
(0018,9471) Table Cradle Tilt Angle1Single
(0018,9472) Frame Display Shutter Sequence1Sequence
(0018,9476) X-Ray Geometry Sequence1Sequence
(0018,9477) Irradiation Event Identification Sequence1Sequence
(0020,9071) Frame Anatomy Sequence1Sequence
(0020,9111) Frame Content Sequence1Sequence
(0020,9253) Respiratory Synchronization Sequence1Sequence
(0020,9450) Patient Orientation in Frame Sequence1Sequence
(0028,9132) Frame VOI LUT Sequence1Sequence
(0028,9415) Frame Pixel Shift Sequence1Sequence
(0028,9422) Pixel Intensity Relationship LUT Sequence1Sequence
(0028,9443) Frame Pixel Data Properties Sequence1Sequence
(5200,9230) Per-frame Functional Groups Sequence1CSequence
Multi-frame DimensionUModule - Image
Cardiac SynchronizationCModule - Image
Respiratory SynchronizationCModule - Image
SpecimenUModule - Image
X-Ray FiltrationUModule - Image
X-Ray GridUModule - Image
Enhanced XA/XRF ImageMModule - Image
XA/XRF AcquisitionCModule - Image
X-Ray Image IntensifierCModule - Image
X-Ray DetectorCModule - Image
XA/XRF Multi-frame PresentationUModule - Image
SOP CommonMModule - Image
Common Instance ReferenceUModule - Image
Frame ExtractionCModule - Image
Enhanced XRF ImageCIOD
RT Ion Beams Treatment RecordCIOD
Ophthalmic Tomography ImageCIOD
X-Ray 3D Angiographic ImageCIOD
X-Ray 3D Craniofacial ImageCIOD
Breast Tomosynthesis ImageCIOD
Enhanced PET ImageCIOD
Surface SegmentationCIOD
Color PaletteCIOD
Enhanced US VolumeCIOD
Lensometry MeasurementsCIOD
Autorefraction MeasurementsCIOD
Keratometry MeasurementsCIOD
Subjective Refraction MeasurementsCIOD
Visual Acuity MeasurementsCIOD
Ophthalmic Axial MeasurementsCIOD
Intraocular Lens CalculationsCIOD
Generic Implant TemplateCIOD
Implant Assembly TemplateCIOD
Implant Template GroupCIOD
RT Beams Delivery InstructionCIOD
Ophthalmic Visual Field Static Perimetry MeasurementsCIOD
Intravascular Optical Coherence Tomography ImageCIOD
Ophthalmic Thickness MapCIOD
Surface Scan MeshCIOD
Surface Scan Point CloudCIOD
Legacy Converted Enhanced CT ImageCIOD
Legacy Converted Enhanced MR ImageCIOD
Legacy Converted Enhanced PET ImageCIOD
Corneal Topography MapCIOD
Breast Projection X-Ray ImageCIOD
Parametric MapCIOD
Wide Field Ophthalmic Photography Stereographic Projection ImageCIOD
Wide Field Ophthalmic Photography 3D Coordinates ImageCIOD
Tractography ResultsCIOD
RT Brachy Application Setup Delivery InstructionCIOD
Planar MPR Volumetric Presentation StateCIOD
Volume Rendering Volumetric Presentation StateCIOD
Content Assessment ResultsCIOD
CT Performed Procedure ProtocolCIOD
CT Defined Procedure ProtocolCIOD
Protocol ApprovalCIOD
Ophthalmic Optical Coherence Tomography En Face ImageCIOD
Ophthalmic Optical Coherence Tomography B-scan Volume AnalysisCIOD
Encapsulated STLCIOD
Encapsulated OBJCIOD
Encapsulated MTLCIOD
RT Physician IntentCIOD
RT Segment AnnotationCIOD
RT Radiation SetCIOD
C-Arm Photon-Electron RadiationCIOD
Tomotherapeutic RadiationCIOD
Robotic-Arm RadiationCIOD
Basic DirectoryCIOD

Built with by Innolitics, a team of medical imaging software developers.

Data synced with official DICOM standard on 12 May 2020. The DICOM Standard is under continuous maintenance, and the current official version is available at DICOM Parts 3, 4, and 6, © NEMA. Please note that the most recent PDF version of the standard is the official reference, and should checked when making technical decisions.

Positioner Isocenter Primary Angle Attribute

TypeRequired (1)
Value Multiplicity1
Value RepresentationSingle (FL)

Position of the X-Ray center beam in the isocenter reference system in the X direction (deg).

See Section C. for further explanation.


Part of the X-Ray Isocenter Reference System Functional Group Macro with usage: U

Section C.

C. Positioner Coordinate System

The Positioner Coordinate System (Op, Xp, Yp, Zp) is defined as follows:

  • Origin Op, is the origin of the Isocenter coordinate system O

  • Xp axis is parallel to the horizontal scan-lines of the detector (rows). Positive direction from left to right of the detector plane looking towards the source.

  • Zp axis is parallel to the vertical scan-lines of the detector (columns). Positive direction from bottom to top of the detector plane looking towards the source.

  • Yp is the axis from the isocenter to the X-Ray source. Positive direction from the Isocenter to the X-Ray Source. This axis is so-called the X-Ray center beam.

Figure C.8.19.6-5. Positioner Coordinate System


The quantities SID and ISO are specified by the Attributes Distance Source to Detector (0018,1110) and Distance Source to Isocenter (0018,9402) respectively.

The Positioner Coordinate System (Op, Xp, Yp, Zp) is characterized, with respect to the Isocenter Coordinate System (O, X, Y, Z), by two angles describing the X-Ray center beam, and a third angle describing the rotation of the X-Ray detector plane. These angles are relative to the Isocenter reference system, and independent from the patient position on the equipment.

Positioner Isocenter Primary Angle (0018,9463) (so-called Ap1 in Figure C.8.19.6-6) is defined in the plane XY, as the angle between the plane YZ and the plane YpZ. The axis of rotation of this angle is the Z axis. Angle from -Y to +X is positive. The valid range of this angle is -180 to +180 degrees.

Positioner Isocenter Secondary Angle (0018,9464) (so-called Ap2 in Figure C.8.19.6-6) is defined in the plane YpZ, as the angle of the X-Ray Center Beam (i.e., Yp) relative to the XY plane. The axis of rotation of this angle is perpendicular to the plane YpZ. Angle from the plane XY to +Z is positive. The valid range of this angle is -180 to +180 degrees.

Positioner Isocenter Detector Rotation Angle (0018,9465) (so-called Ap3 in Figure C.8.19.6-6 and in Figure C.8.19.6-7) is defined in the detector plane, as the angle of the vertical scan-lines of the detector (i.e., Zp) relative to the intersection between the detector plane and the plane YpZ. The sign of this angle is positive clockwise when facing on to the detector plane (see Figure C.8.19.6-7). The valid range of this angle is -180 to +180 degrees.

Figure C.8.19.6-6. Positioner Isocenter Angles

Figure C.8.19.6-7. Positioner Isocenter Detector Rotation Angle when Ap1 = 0 and Ap2 = 0