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PatientMModule - Patient
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General ReferenceMModule - RT Radiation
RT Delivery Device CommonMModule - RT Radiation
RT Radiation CommonMModule - RT Radiation
C-Arm Photon-Electron Delivery DeviceMModule - RT Radiation
C-Arm Photon-Electron BeamMModule - RT Radiation
(300A,0604) Number of RT Control Points1Unsigned Short
(300A,062F) C-Arm Photon-Electron Control Point Sequence1Sequence
(300A,0116) Wedge Position Sequence1CSequence
(300A,0132) Source to External Contour Distance2CSingle
(300A,0600) RT Control Point Index1Unsigned Short
(300A,0605) Referenced Radiation Generation Mode Index1CUnsigned Short
(300A,060B) Referenced Treatment Position Index1CUnsigned Short
(300A,0634) Source to Patient Surface Distance2CDouble
(300A,063C) Cumulative Meterset1CDouble
(300A,063D) Delivery Rate2CDouble
(300A,063E) Delivery Rate Unit Sequence1CSequence
(300A,0655) Number of Wedge Positions1CUnsigned Short
(300A,0656) RT Beam Limiting Device Opening Sequence1CSequence
(300A,0607) Referenced Device Index1Unsigned Short
(300A,064A) Parallel RT Beam Delimiter Positions1CDouble
(300A,064B) RT Beam Limiting Device Offset1CDouble
(300A,064C) RT Beam Delimiter Geometry Sequence1CSequence
(300A,0657) Number of RT Beam Limiting Device Openings1CUnsigned Short
(300A,0679) RT Beam Limiting Device Angle1CDouble
(300A,067A) Source Roll Angle1CDouble
(300A,0689) Beam Area Limit Sequence1CSequence
SOP CommonMModule - RT Radiation
Common Instance ReferenceMModule - RT Radiation
Radiotherapy Common InstanceMModule - RT Radiation
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.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.

RT Beam Limiting Device Offset Attribute

Tag(300A,064B)
TypeConditionally Required (1C)
KeywordRTBeamLimitingDeviceOffset
Value Multiplicity2
Value RepresentationDouble (FD)

The offsets (x,y) in mm of the Parallel RT Beam Delimiter Positions (300A,064A) from the central beam axis.

See Section C.36.2.2.9.1.1 and Section C.36.2.2.8.1.2.

Required if the conditions in Section C.36.2.2.5.1.1 are satisfied.

Section C.36.2.2.9.1.1

C.36.2.2.9.1.1 Geometric Value Attributes

All geometric values in Table C.36.2.2.9-1 are defined in the Beam Modifier Definition Plane.

Section C.36.2.2.8.1.2

C.36.2.2.8.1.2 Parallel RT Beam Delimiter Boundaries

The Parallel RT Beam Delimiter Boundaries (300A,0649) shall be the positions of the mechanical boundaries (projected on the Beam ModifierDefinition Plane defined by the RT Beam Modifier Definition Distance (300A,0688) ) between beam delimiter elements. These are fixed for a given beam limiting device. Parallel RT Beam Delimiter Positions (300A,064A) are values specific to a given Control Point, specifying the beam limiting device element openings.

Section C.36.2.2.5.1.1

C.36.2.2.5.1.1 Requirements for Changing Values within RT Control Point Sequence Attributes

This Section specifies when individual attributes shall be present in a Sequence.

The RT Control Point Sequence specifies a certain order of execution.

At each RT Control Point the value of various Attributes may be specified as an explicit value (which in the case of a type 2C attribute may be a null value) and if absent remain at the same value as specified previously. There are physical and mechanical implications of specifying a new value as opposed to staying at the same value, for example gear lash, floating point jitter, etc.

At the first Sequence Item in RT Control Point Sequences (i.e., with an RT Control Point Index (300A,0600) equal to 1) all Attributes affected by this Section shall be present if applicable conditions are met.

For Sequence Items other than the first Sequence Item, Attributes shall be present if applicable conditions are met and the value is different from the previously populated value for the same Attribute (in the case of a type 2C attribute, a null value is considered as a value). The previously populated value is the value from the Item where the Attribute was present with the greatest value of RT Control Point Index (300A,0600) less than the value of the RT Control Point Index (300A,0600) in the current Item.

This means that for an Item in which an Attribute is absent, the application stays at the value of the previously populated Item.

For Sequences inside a RT Control Point Sequence Item, the Sequence shall be present if any of the nested Attributes affected by this Section differ from the corresponding previously populated Item.

For multi-valued Attributes, such as Parallel RT Beam Delimiter Positions (300A,064A), all values shall be present if any value changes.