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Page 816​

DICOM PS3.3 2020a - Information Object Definitions​

Attribute Name​

Tag​

Type​

 

Description​

>>>RangeModulatorGating​

(300A,0388)​

3​

If Range Modulator Type (300A,0348) is WHL_MODWEIGHTS or​

Stop Water Equivalent​

 

 

WHL_FIXEDWEIGHTS:​

Thickness​

 

 

Waterequivalentthickness(inmm)oftherangemodulatorattheposition​

 

 

 

 

 

 

specified by Range Modulator Gating Stop Value (300A,0384).​

 

 

 

If Range Modulator Type (300A,0348) is FIXED:​

 

 

 

Maximum water equivalent thickness (in mm) of the range modulator.​

>>>Isocenter to Range​

(300A,038A)​

3​

Isocentertodownstreamedgeofrangemodulator(mm)atcurrentcontrol​

Modulator Distance​

 

 

point. See Section C.8.8.25.4 and Section C.8.8.25.10​

>>IncludeTableC.8.8.27-1“BeamLimitingDevicePosition​

 

Macro Attributes”​

 

 

 

 

>>Gantry Angle​

(300A,011E)​

1C​

Gantry angle of radiation source, i.e., orientation of IEC GANTRY​

 

 

 

coordinate system with respect to IEC FIXED REFERENCE coordinate​

 

 

 

system (degrees). Required for first Item of Control Point Sequence, or​

 

 

 

if Gantry Angle changes during Beam.​

>>Gantry Rotation Direction​

(300A,011F)​

1C​

Direction of Gantry Rotation when viewing gantry from isocenter, for​

 

 

 

segment following Control Point. Required for first Item of Control Point​

 

 

 

Sequence, or if Gantry Rotation Direction changes during Beam. See​

 

 

 

Section C.8.8.14.8.​

 

 

 

Enumerated Values:​

 

 

 

CW​ clockwise​

 

 

 

CC​

counter-clockwise​

 

 

 

NONE​no rotation​

>>Gantry Pitch Angle​

(300A,014A)​

2C​

Gantry Pitch Angle of the radiation source, i.e., the rotation of the IEC​

 

 

 

GANTRY coordinate system about the X-axis of the IEC GANTRY​

 

 

 

coordinate system (degrees). Required for first Item of Control Point​

 

 

 

Sequence, or if Gantry Pitch Rotation Angle changes during Beam. See​

 

 

 

Section C.8.8.25.6.5.​

>>Gantry Pitch Rotation​

(300A,014C)​

2C​

Direction of Gantry Pitch Angle when viewing along the positive X-axis​

Direction​

 

 

of the IEC GANTRY coordinate system, for segment following Control​

 

 

 

Point.RequiredforfirstItemofControlPointSequence,orifGantryPitch​

 

 

 

Rotation Direction changes during Beam. See Section C.8.8.14.8 and​

 

 

 

Section C.8.8.25.6.5.​

 

 

 

Enumerated Values:​

 

 

 

CW​ clockwise​

 

 

 

CC​

counter-clockwise​

 

 

 

NONE​no rotation​

>>Beam Limiting Device​

(300A,0120)​

1C​

Beam Limiting Device angle, i.e., orientation of IEC BEAM LIMITING​

Angle​

 

 

DEVICE coordinate system with respect to IEC GANTRY coordinate​

 

 

 

system (degrees). Required for first Item of Control Point Sequence, or​

 

 

 

if Beam Limiting Device Angle changes during Beam.​

- Standard -​

 

DICOM PS3.3 2020a - Information Object Definitions​

Page 817​

Attribute Name​

Tag​

Type​

 

Description​

 

>>Beam Limiting Device​

(300A,0121)​

1C​

Direction of Beam Limiting Device Rotation when viewing beam limiting​

Rotation Direction​

 

 

device (collimator) from radiation source, for segment following Control​

 

 

 

Point. Required for first Item of Control Point Sequence, or if Beam​

 

 

 

Limiting Device Rotation Direction changes during Beam. See​

 

 

 

Section C.8.8.14.8.​

 

 

 

 

Enumerated Values:​

 

 

 

 

CW​ clockwise​

 

 

 

 

CC​ counter-clockwise​

 

 

 

 

NONE​no rotation​

 

>>Scan Spot Tune ID​

(300A,0390)​

1C​

User-supplied or machine code identifier for machine configuration to​

 

 

 

produce beam spot. This may be the nominal spot size or some other​

 

 

 

machine specific value. Required if Scan Mode (300A,0308) is​

 

 

 

MODULATED or MODULATED_SPEC.​

 

>>Scan Spot Reordering​

(300A,0395)​

3​

Indicates whether the spot delivery order shall remain the same as​

Allowed​

 

 

planned order.​

 

 

 

 

 

Enumerated Values:​

 

 

 

 

ALLOWED​

The delivery device may deliver the spots in any order​

 

 

 

NOT​

The delivery device shall not change the order of the​

 

 

 

ALLOWED​ spots within the map and must deliver them in the​

 

 

 

 

prescribed order.​

 

>>Number of Scan Spot​

(300A,0392)​

1C​

Number of spot positions used to specify scanning pattern for current​

Positions​

 

 

segment beginning at control point. Required if Scan Mode (300A,0308)​

 

 

 

is MODULATED or MODULATED_SPEC.​

 

>>Scan Spot Position Map​

(300A,0394)​

1C​

A data stream of (x,y) pairs that define the coordinates of the scan spots​

 

 

 

as projected onto the machine isocentric plane in the IEC GANTRY​

 

 

 

coordinate system (mm). Required if Scan Mode (300A,0308) is​

 

 

 

MODULATED or MODULATED_SPEC. Contains 2N values where N is​

 

 

 

theNumberofScanSpotPositions(300A,0392).SeeSectionC.8.8.25.8.​

>>Scan Spot Meterset​

(300A,0396)​

1C​

AsetofMetersetweightscorrespondingtoscanspotpositions.Theorder​

Weights​

 

 

of weights matches the positions in Scan Spot Positions (300A,0394).​

 

 

 

The sum contained in all Meterset weights shall match the difference of​

 

 

 

thecumulativeMetersetweightofthecurrentcontrolpointtothefollowing​

 

 

 

control point. Required if Scan Mode (300A,0308) is MODULATED or​

 

 

 

MODULATED_SPEC. See Section C.8.8.25.8.​

 

>>Scanning Spot Size​

(300A,0398)​

3​

TheScanningSpotSizeascalculatedusingtheFullWidthHalfMaximum​

 

 

 

(FWHM). Specified by a numeric pair - the size measured in air at​

 

 

 

isocenter in IEC GANTRY X direction followed by the size in the IEC​

 

 

 

GANTRY Y direction (mm).​

 

>>Number of Paintings​

(300A,039A)​

1C​

The number of times the scan pattern given by Scan Spot Position Map​

 

 

 

(300A,0394) and Scan Spot Meterset Weights (300A,0396) shall be​

 

 

 

applied at the current control point. To obtain the Meterset weight per​

 

 

 

painting, the values in the Scan Spot Meterset Weights (300A,0396)​

 

 

 

should be divided by the value of this Attribute. Required if Scan Mode​

 

 

 

(300A,0308) is MODULATED or MODULATED_SPEC.​

 

>>Patient Support Angle​

(300A,0122)​

1C​

Patient Support angle, i.e., orientation of IEC PATIENT SUPPORT​

 

 

 

(turntable) coordinate system with respect to IEC FIXED REFERENCE​

 

 

 

coordinate system (degrees). Required for first Item of Control Point​

 

 

 

Sequence, or if Patient Support Angle changes during Beam.​

- Standard -​

Page 818​

DICOM PS3.3 2020a - Information Object Definitions​

Attribute Name​

Tag​

Type​

 

Description​

>>Patient Support Rotation​

(300A,0123)​

1C​

Direction of Patient Support Rotation when viewing table from above, for​

Direction​

 

 

segment following Control Point. Required for first Item of Control Point​

 

 

 

Sequence,orifPatientSupportRotationDirectionchangesduringBeam.​

 

 

 

See Section C.8.8.14.8.​

 

 

 

Enumerated Values:​

 

 

 

CW​ clockwise​

 

 

 

CC​

counter-clockwise​

 

 

 

NONE​no rotation​

>>Table Top Pitch Angle​

(300A,0140)​

2C​

TableTopPitchAngle,i.e.,therotationoftheIECTABLETOPcoordinate​

 

 

 

system about the X-axis of the IEC TABLE TOP coordinate system​

 

 

 

(degrees). Required for first Item of Control Point Sequence, or if Table​

 

 

 

Top Pitch Angle changes during Beam. See Section C.8.8.25.6.2.​

>>Table Top Pitch Rotation​

(300A,0142)​

2C​

Direction of Table Top Pitch Rotation when viewing the table along the​

Direction​

 

 

positive X-axis of the IEC TABLE TOP coordinate system, for segment​

 

 

 

followingControlPoint.RequiredforfirstItemofControlPointSequence,​

 

 

 

or if Table Top Pitch Rotation Direction changes during Beam. See​

 

 

 

Section C.8.8.14.8 and Section C.8.8.25.6.2.​

 

 

 

Enumerated Values:​

 

 

 

CW​ clockwise​

 

 

 

CC​

counter-clockwise​

 

 

 

NONE​no rotation​

>>Table Top Roll Angle​

(300A,0144)​

2C​

TableTopRollAngle,i.e.,therotationoftheIECTABLETOPcoordinate​

 

 

 

system about the Y-axis of the IEC TABLE TOP coordinate system​

 

 

 

(degrees). Required for first Item of Control Point Sequence, or if Table​

 

 

 

Top Roll Angle changes during Beam. See Section C.8.8.25.6.2.​

>>Table Top Roll Rotation​

(300A,0146)​

2C​

Direction of Table Top Roll Rotation when viewing the table along the​

Direction​

 

 

positive Y-axis of the IEC TABLE TOP coordinate system, for segment​

 

 

 

followingControlPoint.RequiredforfirstItemofControlPointSequence,​

 

 

 

or if Table Top Roll Rotation Direction changes during Beam. See​

 

 

 

Section C.8.8.14.8 and Section C.8.8.25.6.2.​

 

 

 

Enumerated Values:​

 

 

 

CW​ clockwise​

 

 

 

CC​

counter-clockwise​

 

 

 

NONE​no rotation.​

>>Head Fixation Angle​

(300A,0148)​

3​

Angle (in degrees) of the head fixation for eye treatments with respect​

 

 

 

to the Table Top Pitch Angle (300A,0140) coordinate system. Positive​

 

 

 

headfixationangleisthesamedirectionaspositiveTableToppitch.See​

 

 

 

Section C.8.8.25.6.4.​

- Standard -​

 

DICOM PS3.3 2020a - Information Object Definitions​

Page 819​

Attribute Name​

Tag​

Type​

Description​

 

>>Chair Head Frame​

(300A,0151)​

3​

A device-specific value that specifies the relationship between the chair​

Position​

 

 

in which the patient is sitting and the head frame in which their head is​

 

 

 

fixed.​

 

 

 

 

It shall be expressed as a distance in mm, such that positive is towards​

 

 

 

the patient's head away from the seat.​

 

 

 

 

Note​

 

 

 

 

Thisvalueisnotintendedtobeusedforgeometriccalculations,​

 

 

 

however, for the same device, the relative distance is​

 

 

 

 

meaningful.​

 

 

 

 

Typically used for eye treatments.​

 

>>Table Top Vertical​

(300A,0128)​

2C​

Table Top Vertical position in IEC TABLE TOP coordinate system (mm).​

Position​

 

 

Required for first Item ofControl Point Sequence,or if TableTop Vertical​

 

 

 

Position changes during Beam. See Section C.8.8.14.6.​

 

>>Table Top Longitudinal​

(300A,0129)​

2C​

Table Top Longitudinal position in IEC TABLE TOP coordinate system​

Position​

 

 

(mm). Required for first Item of Control Point Sequence, or if Table Top​

 

 

 

Longitudinal Position changes during Beam. See Section C.8.8.14.6.​

>>TableTopLateralPosition​

(300A,012A)​

2C​

Table Top Lateral position in IEC TABLE TOP coordinate system (mm).​

 

 

 

Required for first Item of Control Point Sequence, or if Table Top Lateral​

 

 

 

Position changes during Beam. See Section C.8.8.14.6.​

 

>>Snout Position​

(300A,030D)​

2C​

Axial position of the snout (in mm) measured from isocenter to the​

 

 

 

downstream side of the snout (without consideration of variable length​

 

 

 

elements such as blocks, MLC and/or compensators). Required for first​

 

 

 

Item in Control Point Sequence, or if Snout Position changes during​

 

 

 

Beam.​

 

>>Isocenter Position​

(300A,012C)​

2C​

Isocenter coordinates (x,y,z) in the Patient-Based Coordinate System​

 

 

 

describedinSectionC.7.6.2.1.1(mm).RequiredforfirstItemofSegment​

 

 

 

ControlPointSequence,orifSegmentIsocenterPositionchangesduring​

 

 

 

Beam.​

 

>>Surface Entry Point​

(300A,012E)​

3​

Patient surface entry point coordinates (x,y,z), along the central axis of​

 

 

 

the beam, in the Patient-Based Coordinate System described in​

 

 

 

Section C.7.6.2.1.1 (mm).​

 

>>External Contour Entry​

(300A,0133)​

3​

External Contour entry point coordinates (x,y,z) in the Patient-Based​

Point​

 

 

Coordinate System described in Section C.7.6.2.1.1 (mm).​

 

See Section C.8.8.14.15.​

C.8.8.25.1 Beam Identifying Information​

Beam Number (300A,00C0) is provided to link related information across Modules, and its value has no real-world interpretation.​ Beam Name (300A,00C2), a Type 1 Attribute, is intended to store the primary beam identifier (often referred to as "Field ID"). Beam​ Description (300A,00C3), a Type 3 Attribute, is intended to store additional beam identifying information (often referred to as "Field​ Name").​

C.8.8.25.2 Treatment Machine Name​

TheDICOMStandarddoesnotsupportthetransmissionoftreatmentunitmodelinginformationsuchasdepthdosesandbeamprofiles.​ In the case of Ion therapy, the Treatment Machine Name Attribute is used to uniquely identify a treatment port (or beam line), since​ there is in effect only one treatment machine (i.e., synchrotron).​

- Standard -​

Page 820​

DICOM PS3.3 2020a - Information Object Definitions​

C.8.8.25.3 Leaf Position Boundaries​

The Leaf Position Boundaries (300A,00BE) shall be the positions of the mechanical boundaries (projected to the isocentric plane)​ between beam limiting device (collimator) leaves, fixed for a given beam limiting device (collimator). Leaf/Jaw positions (300A,011C)​ are values specific to a given control point, specifying the beam limiting device (collimator) leaf (element) openings.​

In an RT Ion Plan, the Virtual SAD can have different values along the X/Y axes (see Section C.8.8.25.4). Thus the effects of possibly​ different X/Y SADs shall be taken into account when leaf position boundaries and leaf/jaw positions are projected from the virtual​ source to the plane of isocenter.​

Leaf Position Boundaries (300A,00BE), are outside the control point sequence, which may define a collimator rotation. Therefore​ their values shall be defined for a collimator angle of 0 Deg IEC nominal position). For rotated collimators, the leaf position calculation​ is as follows: Define Mx and My as the magnification factors for the scaling of the leaf positions from their real space position to the​ isocenter plane. Mx and My are calculated from the virtual SADs VSADx or VSADy, respectively, and the Isocenter to Beam Limiting​ Device Distance (300A,00BB).​

The magnification factor Mα for an arbitrary beam limiting device angle a then becomes:​

Snout Position (300A,030D) may be changed between beams, and possibly between control points as well. This results in different​ effective isocenter to beam limiting device distances and thus leaf position boundaries for the same physical beam limiting device for​ each beam and possibly control points.​

The values for Beam Limiting Device Distances (300A,00BB) and Leaf Position Boundaries (300A,00BE) are defined outside the​ control point sequence. Therefore the Isocenter to Beam Limiting Device Distance (300A,00BB) and the Leaf Position Boundaries​ (300A,00BE) shall be defined to apply to the first control point of the respective beam. If the snout position changes for subsequent​ control points, this must be taken into account for the projection of the leaf/jaw positions (i.e., replace IsocenterToBeamLimitingDevi-​ ceDistance in the above formula by the effective distance as calculated from the shift in snout position).​

C.8.8.25.4 Virtual Source-Axis Distances and the Use of Trays in Ion Therapy​

The apparent source position in ion therapy is not constant or can be different in x or y direction. The apparent source position (as​ measured from field size projections) shall be called Virtual Source, the distance from the virtual source to isocenter the Virtual SAD.​

Most of the cases, no trays are used for blocks, compensators and wedges. However, the concept of trays together with the mounting​ position is useful for specifying exactly at which point the position of these devices shall be measured. Therefore, trays shall always​ be present, even though they are only virtual trays.​

Figure C.8.8.25-1 shows an example.​

Block

 

 

 

Compensator

( Mounting Position

 

 

 

 

 

( Mounting Position

 

 

 

 

= PATIENT SIDE )

 

 

 

 

 

= SOURCE SIDE )

Virtual

 

 

 

 

 

 

 

 

 

 

 

 

Source (X/Y)

 

 

 

 

 

Isocenter

 

 

 

 

 

 

Block Tray

 

 

 

 

 

Compensator Tray

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(virtual)

 

 

 

(virtual)

Virtual Source

Axis Distance

Isocenter to Block Tray

Distance

Isocenter to Compensator

Distance

Figure C.8.8.25-1. Virtual Source-Axis Distances​

Examples: The use of the above Attributes for snout positioning and block/compensator manufacturing:​

- Standard -​

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