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PatientMModule - Patient
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General SeriesMModule - Series
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General EquipmentMModule - Equipment
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(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
(0018,1006) Grid ID3Long String
(0018,7040) Grid Absorbing Material3Long Text
(0018,7041) Grid Spacing Material3Long Text
(0018,7042) Grid Thickness3Decimal String
(0018,7044) Grid Pitch3Decimal String
(0018,7046) Grid Aspect Ratio3Integer String
(0018,7048) Grid Period3Decimal String
(0018,704C) Grid Focal Distance3Decimal String
(0018,9341) Contrast/Bolus Usage Sequence1Sequence
(0018,9405) Positioner 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
(0018,9451) Frame Detector Parameters Sequence1Sequence
(0018,9455) Calibration Sequence1Sequence
(0018,9462) Isocenter Reference System Sequence1Sequence
(0018,9543) X-Ray Source Isocenter Primary Angle1Double
(0018,9544) X-Ray Source Isocenter Secondary Angle1Double
(0018,9545) Breast Support Isocenter Primary Angle1Double
(0018,9546) Breast Support Isocenter Secondary Angle1Double
(0018,9547) Breast Support X Position to Isocenter1CDouble
(0018,9548) Breast Support Y Position to Isocenter1CDouble
(0018,9549) Breast Support Z Position to Isocenter1CDouble
(0018,9550) Detector Isocenter Primary Angle1Double
(0018,9551) Detector Isocenter Secondary Angle1Double
(0018,9552) Detector X Position to Isocenter1CDouble
(0018,9553) Detector Y Position to Isocenter1CDouble
(0018,9554) Detector Z Position to Isocenter1CDouble
(0018,9557) Detector Active Area TLHC Position1CDouble
(0018,9558) Detector Active Area Orientation1CDouble
(0018,9472) Frame Display Shutter Sequence1Sequence
(0018,9476) X-Ray Geometry Sequence1Sequence
(0018,9477) Irradiation Event Identification Sequence1Sequence
(0018,9541) Detector Position Sequence1Sequence
(0018,9542) X-Ray Acquisition Dose Sequence1Sequence
(0018,9555) X-Ray Grid Sequence1Sequence
(0018,9556) X-Ray Filter Sequence1Sequence
(0020,9071) Frame Anatomy Sequence1Sequence
(0020,9111) Frame Content Sequence1Sequence
(0028,9132) Frame VOI LUT Sequence1Sequence
(0028,9145) Pixel Value Transformation Sequence1Sequence
(0028,9443) Frame Pixel Data Properties Sequence1Sequence
(5200,9230) Per-frame Functional Groups Sequence1CSequence
Multi-frame DimensionUModule - Image
Patient OrientationMModule - Image
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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.nema.org/. 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.

Detector Isocenter Primary Angle Attribute

Tag(0018,9550)
TypeRequired (1)
KeywordDetectorIsocenterPrimaryAngle
Value Multiplicity1
Value RepresentationDouble (FD)

Primary angle of the Detector in the isocenter reference system (deg).

See C.8.31.6.1.4 for further explanation.

Note

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

C.8.31.6.1.4

C.8.31.6.1.4 Detector Coordinate System

A detector coordinate system is defined that allows the detector to be either stationary or in motion. For clarity of understanding and interoperability, detector motion terms that may be used during image acquisition are defined, as indicated in Type of Detector Motion (0054,0202):

  • Stationary Detector

  • Rotating Detector

  • Translating Detector

  • Complex Detector

An infinite variation of detector motions is possible through time- and angle- dependent combinations of detector rotation and detector translation.

At any given point in time during image acquisition the detector origin Od may be translated with respect to the system isocenter and/or the detector coordinate system rotated with respect to the isocenter coordinate system. The detector coordinate system (Od, Xd, Yd, Zd) is defined as follows (see Figure C.8.31.6-9):

  • Detector Reference Point Od, is an arbitrary point, defined by the equipment manufacturer, that lies on the axis of rotation of the detector, if any.

  • Xd axis lies in the plane parallel to the detector surface, through the point Od, and perpendicular to the axis of rotation. The +Xd direction is in the same direction as the +X direction when the detector surface is normal to gravity.

  • Yd axis is the axis of rotation of the detector and is parallel to Y. The +Yd direction is in the same direction as the +Y direction when the detector surface is normal to gravity.

  • Zd axis is normal to the detector surface and through the point Od. The +Zd direction is upward, defined by the right-hand rule from +Xd and +Yd.

Figure C.8.31.6-9. Detector Coordinate System


The Detector coordinate system (Od, Xd, Yd, Zd) is characterized with respect to the Isocenter coordinate system (O, X, Y, Z), by two angles describing the tilt of the detector. These angles are relative to the Isocenter reference system, and independent from the patient position on the equipment.

Detector Isocenter Primary Angle (0018,9550) (so-called Ad1) is defined as the angle between the YZ plane and the YZd plane. The angle is positive when the +Xd axis is lower than the -Xd axis with respect to Z, and is 0°when the detector surface is normal to the +Z axis.

Detector Isocenter Secondary Angle (0018,9551) (so-called Ad2) is defined as the angle between the plane XZ and the plane XZd. The angle is positive when the +Yd axis is lower than the -Yd axis with respect to Z. In most cases this angle is 0°, inferring that the XZ plane is parallel to the Xd plane.

Figure C.8.31.6-10. Detector Isocenter Angles


Detector X Position to Isocenter (0018,9552) (so-called DX) is defined as the translation of the Detector Reference Point Od with respect to the Isocenter coordinate system in the X direction. A translation of DX toward Breast Support Right from Detector Od is positive.

Detector Y Position to Isocenter (0018,9553) (so-called DY) is defined as the translation of the Detector Reference Point Od with respect to the Isocenter coordinate system in the Y direction. A translation of DY toward Breast Support Anterior from Detector Od is positive.

Detector Z Position to Isocenter (0018,9554) (so-called DZ) is defined as the translation of the Detector Reference Point Od with respect to the Isocenter coordinate system in the Z direction. A translation of DZ toward Breast Support Head from Detector Od is positive.

Figure C.8.31.6-11. Translation of the Detector Coordinate System


Although not shown in Figure C.8.31.6-11, translation of the detector moves the Detector Origin Od relative to the Isocenter. Thus during translation of the detector, at least one of DX, DY and DZ will change.

Note

A translation of (DX, DY, DZ) = (0, 0, 0) means that the Detector Reference Point Od is at the System Isocenter.

The case where the detector is stationary during image acquisition is a degenerate case, but still defined in the same manner.

Note

  1. An angulation of (Ad1, Ad2) = (0, 0) means that the Detector is not rotated relative to the System Isocenter coordinate system.

  2. A translation of (DX, DY, DZ) = (0, 0, 0) means that the Detector Reference Point Od is at the System Isocenter.