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DICOM PS3.3 2020a - Information Object Definitions​

Page 841​

Attribute Name​

Tag​

Type​

 

Description​

 

>>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 (collimator) angle, i.e., orientation of IEC BEAM​

Angle​

 

 

LIMITING DEVICE coordinate system with respect to IEC GANTRY​

 

 

 

coordinate system (degrees). Required for Control Point 0 of Ion Control​

 

 

 

PointDeliverySequence(3008,0041)orifbeamlimitingdevice(collimator)​

 

 

 

angle changes during beam administration.​

 

>>Beam Limiting Device​

(300A,0121)​

1C​

Direction of Beam Limiting Device Rotation when viewing beam limiting​

Rotation Direction​

 

 

device(collimator)fromradiationsource,forsegmentbeginningatcurrent​

 

 

 

Control Point. Required for Control Point 0 of Ion Control Point Delivery​

 

 

 

Sequence (3008,0041) or if Beam Limiting Device Rotation Direction​

 

 

 

changes during beam administration.​

 

 

 

 

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.​

 

>>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 Metersets​

(3008,0047)​

1C​

A set of Meterset values delivered to the scan spot positions. The order​

Delivered​

 

 

of Metersets matches the positions in Scan Spot Position Map​

 

 

 

(300A,0394). The sum contained in all Metersets shall match the​

 

 

 

difference of the Delivered Meterset of the current control point to the​

 

 

 

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

 

 

 

MODULATED or MODULATED_SPEC. See Section C.8.8.25.8.​

>>Scan Spot Time Offset​

(300A,038F)​

3​

A set of time offsets (in microseconds). Each offset is the time from the​

 

 

 

Treatment Control Point Time (3008,0025) until both the beam has​

 

 

 

reached the X,Y position recorded in the Scan Spot Position Map​

 

 

 

(300A,0394) and ion delivery has started at this position.​

 

The order of values matches the order of positions in Scan Spot Position​

Map (300A,0394).​

The number of values shall equal the value of Number of Scan Spot​

Positions (300A,0392).​

- Standard -​

Page 842​

DICOM PS3.3 2020a - Information Object Definitions​

Attribute Name​

Tag​

Type​

Description​

>>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 intended number of times the scan pattern given by Scan Spot​

 

 

 

PositionMap(300A,0394)andScanSpotMetersetWeights(300A,0396)​

 

 

 

in the Referenced RT Plan was to be applied at the current control point.​

 

 

 

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

 

 

 

MODULATED_SPEC.​

>>Scan Spot Reordered​

(300A,0393)​

3​

Indicates that the spots were delivered in a different order than in the​

 

 

 

plan.​

 

 

 

Enumerated Values:​

 

 

 

YES​The delivery machine changed the spot order​

 

 

 

NO​ The delivery machine delivered the spots in the order as planned​

 

 

 

When absent it is not known if the treatment delivery device delivered or​

 

 

 

reported in the order as planned. See Note 1.​

>>Scan Spot Prescribed​

(300A,0391)​

1C​

Theindicesoftheprescribedspotscorrespondingtoeachdeliveredspot.​

Indices​

 

 

These indices are the ordinal positions of the spots in the Scan Spot​

 

 

 

Meterset Weights (300A,0396) in the Ion Control Point Sequence​

 

 

 

(300A,03A8) of the referenced RT Ion Plan. The numbering of indices of​

 

 

 

the prescribed spots shall start at one (a value of one refers the first​

 

 

 

ordinal position).​

 

 

 

Required, if Scan Spot Reordered (300A,0393) equals YES.​

 

 

 

Contains N values where N is the Number of Scan Spot Positions​

 

 

 

(300A,0392).​

>>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 Control Point 0 of Ion Control​

 

 

 

PointDeliverySequence(3008,0041)orifPatientSupportAnglechanges​

 

 

 

during beam administration.​

>>Patient Support Rotation​

(300A,0123)​

1C​

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

Direction​

 

 

segment beginning at current Control Point.​

 

 

 

Required for Control Point 0 of Ion Control Point Delivery Sequence​

 

 

 

(3008,0041), or if Patient Support Rotation Direction changes during​

 

 

 

beam administration.​

 

 

 

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.​

- Standard -​

 

DICOM PS3.3 2020a - Information Object Definitions​

Page 843​

Attribute Name​

Tag​

Type​

 

Description​

 

>>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​

Table Top Roll Angle, i.e., the rotation of the IEC TABLE TOP coordinate​

 

 

 

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​

 

 

 

theTableTopPitchAngle(300A,0140)coordinatesystem.Positivehead​

 

 

 

fixation angle is the same direction as positive Table Top Pitch. See​

 

 

 

Section C.8.8.25.6.4.​

 

>>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​

 

 

Thisvalueisinterpretedasanabsolute,ratherthanrelative,Tablesetting.​

 

 

 

Required for Control Point 0 of Ion Control Point Delivery Sequence​

 

 

 

(3008,0041) or if Table Top Vertical Position changes during beam​

 

 

 

administration.​

 

>>Table Top Longitudinal​

(300A,0129)​

2C​

Table Top Longitudinal position in IEC TABLE TOP coordinate system​

Position​

 

 

(mm).Thisvalueisinterpretedasanabsolute,ratherthanrelative,Table​

 

 

 

setting. Required for Control Point 0 of Ion Control Point Delivery​

Sequence (3008,0041) or if Table Top Longitudinal Position changes​ during beam administration.​

- Standard -​

Page 844​

DICOM PS3.3 2020a - Information Object Definitions​

Attribute Name​

Tag​

Type​

Description​

>>TableTopLateralPosition​

(300A,012A)​

2C​

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

 

 

 

Thisvalueisinterpretedasanabsolute,ratherthanrelative,Tablesetting.​

 

 

 

Required for Control Point 0 of Ion Control Point Delivery Sequence​

 

 

 

(3008,0041) or if Table Top Lateral Position changes during beam​

 

 

 

administration.​

>>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​

 

 

 

elementssuchasblocks,MLCand/orcompensators).RequiredforControl​

 

 

 

Point 0 of Ion Control Point Delivery Sequence (3008,0041) or if Snout​

 

 

 

Position changes during beam administration.​

>>Corrected Parameter​

(3008,0068)​

3​

A Sequence of Items describing corrections made to any Attributes prior​

Sequence​

 

 

to delivery of the next control point.​

 

 

 

One or more Items are permitted in this Sequence.​

>>>Parameter Sequence​

(3008,0061)​

1​

Contains the Data Element Tag of the parent Sequence containing the​

Pointer​

 

 

Attributethatwascorrected.ThevalueislimitedinscopetotheTreatment​

 

 

 

Session Ion Beam Sequence (3008,0021) and all nested Sequences​

 

 

 

therein.​

>>>Parameter Item Index​

(3008,0063)​

1​

Contains the Sequence Item index (monotonically increasing from 1) of​

 

 

 

the corrected Attribute within its parent Sequence as indicated by​

 

 

 

Parameter Sequence Pointer (3008,0061).​

>>>Parameter Pointer​

(3008,0065)​

1​

Contains the Data Element Tag of the Attribute that was corrected.​

>>>Correction Value​

(3008,006A)​

1​

The value that was added the value referenced by the Parameter​

 

 

 

Sequence Pointer (3008,0061), Parameter Item Index (3008,0063) and​

 

 

 

Parameter Pointer (3008,0065).​

>>Override Sequence​

(3008,0060)​

3​

Sequence of parameters that were overridden during the administration​

 

 

 

of the beam segment immediately prior to the current control point.​

 

 

 

One or more Items are permitted in this Sequence.​

>>>Parameter Sequence​

(3008,0061)​

1​

Contains the Data Element Tag of the parent Sequence containing the​

Pointer​

 

 

Attributethatwasoverriden.ThevalueislimitedinscopetotheTreatment​

 

 

 

Session Ion Beam Sequence (3008,0021) and all nested Sequences​

 

 

 

therein.​

>>>Override Parameter​

(3008,0062)​

1​

Contains the Data Element Tag of the Attribute that was overridden.​

Pointer​

 

 

 

>>>Parameter Item Index​

(3008,0063)​

1​

Contains the Sequence Item index (monotonically increasing from 1) of​

 

 

 

the overriden Attributes within it's parent Sequence. The value is limited​

 

 

 

in scope to the Treatment Session Ion Beam Sequence (3008,0021) and​

 

 

 

all nested Sequences therein.​

>>>Parameter Value​

(3008,0067)​

3​

Positiveintegeridentifyingwhichvalueofamulti-valuedAttributeidentified​

Number​

 

 

by Override Parameter Pointer (3008,0062) is referenced. The value 1​

 

 

 

identifies the first value.​

>>>Operators' Name​

(0008,1070)​

2​

Name of operator who authorized override.​

>>>Operator Identification​

(0008,1072)​

3​

Identification of the operator who authorized override. Only a single Item​

Sequence​

 

 

is permitted in this Sequence.​

>>>>Include Table 10-1 “Person Identification Macro​ Attributes Description”​

>>>Override Reason​

(3008,0066)​

3​

User-defined description of reason for override of parameter specified​ by Override Parameter Pointer (3008,0062).​

- Standard -​

DICOM PS3.3 2020a - Information Object Definitions​

Page 845​

Note​

Recordinganextratuningspotisconsideredreordering,evenifthespotsweredeliveredintheprescribedorder.Ifre-painted​ spots (i.e., Number of Paintings (300A,039A) > 1) are recorded separately, then this is also considered reordering.​

C.8.8.26.1 Specified and Delivered Meterset Values​

Specified and Delivered Meterset values on beam and control point level shall be handled as specified for RT Beams Session records​

in Section C.8.8.21.2.​

C.8.8.26.2 Scan Spot Prescribed Indices​

Scan Spot Prescribed Indices (300A,0391) are used to associate each delivered spot with its corresponding prescribed spot. If the​ ordering information is unknown, both Scan Spot Reordered (300A,0393) and Scan Spot Prescribed Indices (300A,0391) shall be​ absent.​

There are various cases how the scan spots are delivered in comparison with the prescribed spot order.​

Following are various examples specifying how the scan spot prescribed index shall be used.​

C.8.8.26.2.1 Content of RT Ion Plan for following Use Cases​

It is assumed that the RT Ion Plan contains the following spot positions in the Scan Spot Position Map (300A,0394) and related Scan​ Spot Meterset Weights (300A,0396).​

The following table is a representation of the prescription where “w” represents the Scan Spot Meterset Weight.​

Scan Spot Position Map (300A,0394)​

Scan Spot Metersets Delivered (3008,0047)​

x0,y0​

w0​

x1,y1​

w1​

x2,y2​

w2​

x3,y3​

w3​

x4,y4​

w4​

The prescription does not contain an explicit index for the scan spot order. The index is defined implicitly by the order of the spots​ within the prescribed map. The implicit index starts at 0.​

The following examples specify some different cases of delivered scan spot order that can then be supported using the spot index in​ the RT Ion Beams Treatment Record.​

C.8.8.26.2.2 Treatment Recording Use Cases​

The following tables contain 3 columns as follows:​

First column: The delivered Scan Spot Position in the Scan Spot Position Map (300A,0394). In this column the spot positions are​ annotatedastheyhavebeendelivered.TheindexfollowingthecoordinatecharacterreferstotheindexintheRTIonPlan.Iftheindex​ is appended, it shows that 2 or more delivered scan spots refer to the same Scan Spot Position in the RT Ion Plan.​

Second column: The Scan Spot Meterset Delivered (3008,0047). The Meterset Delivered is indicated by 'm'.​

Thirdcolumn:TheScanSpotPrescribedIndices(300A,0391)referringtothepositionintheScanSpotMetersetWeights(300A,0396)​ of the referenced RT Ion Plan are indicated as they are recorded in the RT Ion Beams Treatment Record.​

C.8.8.26.2.3 Use Case 1: No pause, no spot reordering, no spot splitting, no repainting​

This use case is an example where the spots are treated in the exact order as prescribed in the RT Ion Plan.​

Scan Spot Position Map (300A,0394)​

Scan Spot Metersets Delivered (3008,0047)​

x1,y1​

m1​

- Standard -​

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