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DICOM PS3.3 2020a - Information Object Definitions​

Page 1591​

•​The Beam Modifier Coordinate System rotates about the z-axis of the Base Beam Modifier Coordinate System. The orientation at​ a zero angle about the z-axis is the same as the Base Beam Modifier Coordinate System, i.e., the x- and y-axes are aligned.​

•​The x/y plane of the Beam Modifier Coordinate System is referred to as the Beam Modifier Definition Plane.​

C.36.1.1.10 Radiation Source​

A Radiation Source is a generalized source of radiation that encompasses linear accelerators, brachytherapy sources, etc. Each​ source is associated with a nominal Radiation Source location which is a point in space from which the radiation is considered to be​ emanating.​

C.36.2 RT Second Generation Macros​

C.36.2.1 RT Second Generation General Purpose Macros​

C.36.2.1.1 Radiation Fraction Pattern Macro​

The Radiation Fraction Pattern Macro specifies the intended fraction pattern to be used to deliver the radiation treatment.​

Table C.36.2.1.1-1. Radiation Fraction Pattern Macro Attributes​

Attribute Name​

Tag​

Type​

Attribute Description​

Fraction Pattern Sequence​

(3010,0079)​

1C​

The pattern of delivery of fractions within and across days of the week​

 

 

 

in a machine-readable form.​

 

 

 

Required if a fraction pattern has been defined.​

 

 

 

Only a single Item shall be included in this Sequence.​

>Number of Fraction Pattern​

(300A,0079)​

1C​

The maximum number of fractions encodable within a day in a Fraction​

Digits Per Day​

 

 

Pattern (3010,0087).​

 

 

 

RequiredifWeekdayFractionPatternSequence(3010,0087)ispresent.​

 

 

 

See Section C.36.2.1.1.1.1.​

>Repeat Fraction Cycle​

(300A,007A)​

1C​

Number of weeks needed to describe fraction pattern.​

Length​

 

 

RequiredifWeekdayFractionPatternSequence(3010,0087)ispresent.​

 

 

 

 

 

 

See Section C.36.2.1.1.1.1.​

>Weekday Fraction Pattern​

(3010,0087)​

3​

Sequence of week-day based fraction patterns.​

Sequence​

 

 

Each Item represents an alternative pattern.​

 

 

 

 

 

 

One or more Items are permitted in this Sequence.​

 

 

 

See Section C.36.2.1.1.1.1.​

>>Fraction Pattern​

(300A,007B)​

3​

String of 0's (no treatment) and 1's (treatment) describing the fraction​

 

 

 

patternforthefractionsdefinedbythisset.Lengthofstringis7xNumber​

 

 

 

of Fraction Pattern Digits Per Day x Repeat Fraction Cycle Length. The​

 

 

 

first character of the string represents Monday.​

 

 

 

See Section C.36.2.1.1.1.1.​

>>IntendedStartDayofWeek​

(3010,0086)​

3​

String of 0's (no treatment) and 1's (treatment) describing the intended​

 

 

 

start fraction for this set. Length of string is 7 x Number of Fraction​

 

 

 

Pattern Digits Per Day x Repeat Fraction Cycle Length. The first​

 

 

 

character of the string represents Monday.​

See Section C.36.2.1.1.1.2.​

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Page 1592​

DICOM PS3.3 2020a - Information Object Definitions​

Attribute Name​

Tag​

Type​

Attribute Description​

>Minimum Hours between​

(3010,0084)​

3​

Minimum number of hours between consecutive fractions.​

Fractions​

 

 

Consecutive fractions are given in Number of Fraction Pattern Digits​

 

 

 

 

 

 

Per Day (300A,0079).​

>IntendedFractionStartTime​

(3010,0085)​

3​

The intended time(s) of day when the first RT Treatment Fraction of the​

 

 

 

day should be started.​

C.36.2.1.1.1 Radiation Fraction Pattern Macro Attribute Descriptions​

C.36.2.1.1.1.1 Fraction Pattern​

The Radiation Fraction Pattern describes the intended scheme, i.e., how fractions are to be distributed along calendar days for the​ actual radiation set.​

Examples of Fraction Patterns:​

1.​1 fraction per day (Monday to Friday) , no fractions on Saturday and Sunday, 1 week-pattern:​ Number of Fraction Pattern Digits Per Day (300A,0079) = 1​

Repeat Fraction Cycle Length (300A,007A) = 1​

Fraction Pattern (300A,007B) = 1111100​

2.​2 fractions per day (Monday to Friday) , no fractions on Saturday and Sunday 1 week-pattern:​ Number of Fraction Pattern Digits Per Day (300A,0079) = 2​

Repeat Fraction Cycle Length (300A,007A) = 1​

Fraction Pattern (300A,007B) = 11111111110000​

3.​1 fraction per day (Monday, Wednesday, Friday) , no fractions on Saturday and Sunday 1 week-pattern:​ Number of Fraction Pattern Digits Per Day (300A,0079) = 1​

Repeat Fraction Cycle Length (300A,007A) = 1​

Fraction Pattern (300A,007B) = 1010100​

4.​2 fractions per day (Monday, Wednesday, Friday) , one fraction on Saturday morning and Sunday afternoon 1 week-pattern:​ Number of Fraction Pattern Digits Per Day (300A,0079) = 2​

Repeat Fraction Cycle Length (300A,007A) = 1​

Fraction Pattern (300A,007B) = 11001100111001​ 5.​1 fraction per day every other day 2 week-pattern:​

Number of Fraction Pattern Digits Per Day (300A,0079) = 1​

Repeat Fraction Cycle Length (300A,007A) = 2​

Fraction Pattern (300A,007B) = 10101010101010​

C.36.2.1.1.1.2 Intended Start Day of Week​

TheIntendedStartDayofWeek(3010,0086)specifiestheday(s)oftheweek,whenthefirstfractionofthetreatmentshouldbedelivered.​ If more than one day is specified, one of the days may be selected to start the treatment.​

The treatment then continues as specified in Fraction Pattern (300A,007B), irrespective of when the actual delivery starts.​

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DICOM PS3.3 2020a - Information Object Definitions​

Page 1593​

Examples of Intended Start Day of Week and the relation to Fraction Pattern:​

1.​1 Start Day, one fraction per day​

The treatment should start on Wednesday and be continued at Friday of the first week, followed by treatments at Monday,​ Wednesday, Friday the next week etc., until all fractions are delivered.​

Number of Fraction Pattern Digits Per Day (300A,0079) = 1​

Repeat Fraction Cycle Length (300A,007A) = 1​

Fraction Pattern (300A,007B) = 1010100​

Intended Start Day of Week (3010,0086) = 0010000​

2.​Start of any of 3 days, two fractions per day​

Treatment should start​

•​on Monday morning and continued by 1 fraction on Monday afternoon, 2 fractions on Wednesday and Friday​

•​or on Monday afternoon and continued by 2 fractions on Wednesday and Friday​

•​or on Wednesday morning, followed by a fraction on Wednesday afternoon, folloed by 2 fractions on Friday.​

The treatment will continue the next week with 2 fractions on Monday, Wednesday, Friday etc. until all fractions are delivered.​

Number of Fraction Pattern Digits Per Day (300A,0079) = 1​

Repeat Fraction Cycle Length (300A,007A) = 2​

Fraction Pattern (300A,007B) = 11001100110000​

Intended Start Day of Week (3010,0086) = 11001000000000​

C.36.2.1.2 RT Treatment Phase Macro​

The treatment phase Macro contains the identification and additional information about an RT Treatment Phase.​

Table C.36.2.1.2-1. RT Treatment Phase Macro Attributes​

Attribute Name​

Tag​

Type​

Attribute Description​

RT Treatment Phase Index​

(3010,003A)​

1​

Index of the RT Treatment Phase in the Sequence.​

RT Treatment Phase UID​

(3010,003B)​

2​

A UID by which this RT Treatment Phase can be​

 

 

 

referenced.​

Include Table 10.31-1 “Entity Labeling Macro Attributes”​

 

 

Intended Phase Start Date​

(3010,004C)​

2​

The date when this treatment phase is intended to​

 

 

 

start.​

 

 

 

See Section C.36.2.1.2.1.1.​

Intended Phase End Date​

(3010,004D)​

2​

The date when this treatment phase is intended to​

 

 

 

be completed.​

See Section C.36.2.1.2.1.1.​

C.36.2.1.2.1 RT Treatment Phase Macro Attribute Descriptions​

C.36.2.1.2.1.1 Intended Phase Start Date, Intended Phase End Date​

The Intended Phase Start Date (3010,004C) and Intended Phase End Date (3010,004D) contains the date when this treatment phase​ is intended to be started or completed. Do not confuse the content of this Attribute with the date when the treatment delivery is​

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Page 1594​

DICOM PS3.3 2020a - Information Object Definitions​

scheduled or when it actually starts or ends. The scheduled date is managed by workflow systems where definitive treatment session​ scheduling is maintained. The actual date of performed delivery will be available in the RT Radiation Record Instances. The actual​ dates may differ from the Intended Phase Start Date (3010,004C) and/or Intended Phase End Date (3010,004D).​

C.36.2.1.3 RT Treatment Phase Interval Macro​

TheRTTreatmentPhaseIntervalMacrocontainstheinformationabouttime-relationshipbetweenRTTreatmentPhases.Thisconsists​ of sets of pair-wise relationships, declaring the relation of a earlier phase to a later, potentially overlapping, phase.​

Table C.36.2.1.3-1. RT Treatment Phase Interval Macro Attributes​

Attribute Name​

Tag​

Type​

Attribute Description​

RTTreatmentPhaseInterval​ (3010,004E)​

2​

Intervals between treatment phases.​

Sequence​

 

 

Zero or more Items shall be included in this Sequence.​

 

 

 

 

 

 

See Section C.36.2.1.3.2.​

>BasisRTTreatmentPhase​ (3010,003E)​

1​

The RT Treatment Phase which provides the basis for this interval.​

Index​

 

 

This index corresponds to an Item in the Intended RT Treatment Phase​

 

 

 

 

 

 

Sequence (3010,004B).​

 

 

 

See Section C.36.2.1.3.1.​

>Related RT Treatment​

(3010,003F)​

1​

The RT Treatment Phase which is related to the phase identified by Basis​

Phase Index​

 

 

RT Treatment Phase Index (3010,003E). Each RT Treatment Phase Index​

 

 

 

value shall appear in this Attribute in only one Item within this Sequence.​

 

 

 

This index corresponds to an Item in the Intended RT Treatment Phase​

 

 

 

Sequence (3010,004B).​

 

 

 

See Section C.36.2.1.3.1.​

>Temporal Relationship​

(3010,004F)​

1C​

TheanchorpointoftheintervalspecifiedinthisItemwithrespecttothephase​

Interval Anchor​

 

 

referenced by the Basis RT Treatment Phase Index (3010,003E).​

 

 

 

Enumerated Values:​

 

 

 

START​The interval is specified with respect to the start of the basis phase.​

 

 

 

END​ The interval is specified with respect to the end of the basis phase.​

 

 

 

Required if a value is present in Minimum Number of Interval Days​

 

 

 

(3010,0050) or Maximum Number of Interval Days (3010,0051).​

>Minimum Number of​

(3010,0050)​

2​

Theminimumnumberofdaysthatthestartoftherelatedphaseshouldfollow​

Interval Days​

 

 

thebasisphasereferencedinBasisRTTreatmentPhaseIndex(3010,003E).​

 

 

 

Fractional values are allowed. Negative values are allowed if Temporal​

 

 

 

Relationship Interval Anchor (3010,004F) has a value of END.​

>Maximum Number of​

(3010,0051)​

2​

The maximum number of days that the start of the related phase should​

Interval Days​

 

 

follow the basis phase referenced Basis RT Treatment Phase Index​

 

 

 

(3010,003E).​

Fractional values are allowed. Negative values are allowed if Temporal​

Relationship Interval Anchor (3010,004F) has a value of END.​

C.36.2.1.3.1 Referenced RT Treatment Phases​

The RT Treatment Phase Interval Sequence (3010,004E) allows the definition of an interval between two treatment phases. RT​ Treatment Phases referenced by the Basis RT Treatment Phase Index (3010,003E) and the Related RT Treatment Phase Index​ (3010,003F) are related in terms of the number of days between them. Note that the number of days can also be negative and​ therefore the related treatment phase could start before the prior treatment phase starts respectively ends.​

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DICOM PS3.3 2020a - Information Object Definitions​

Page 1595​

EachRTTreatmentPhaseidentifiedbytheRelatedRTTreatmentPhaseIndex(3010,003F)mayberelatedtoonlyoneRTTreatment​ Phase identified by the Basis RT Treatment Phase Index (3010,003E). Therefore, any Basis RT Treatment Phase Index (3010,003E)​ must only appear once in Related RT Treatment Phase Index (3010,003F) within the Sequence.​

See also Section C.36.6.1.4.​

As a result of the combinations possible, the maximum number of Items in the RT Treatment Phase Interval Sequence (3010,004E)​ shall be one less than the number of treatment phases present.​

C.36.2.1.3.2 RT Treatment Phase Interval Conflicts​

The Standard does not preclude encoding conflicting information.​

C.36.2.1.4 Dosimetric Objective Macro​

The Dosimetric Objective Macro specifies an intended goal to be used in the definition of the dosimetric plan, for plan optimization​ etc. Dosimetric Objectives may define limits which affect the dose, such as dose volume constraints, minimum or maximum dose,​ treatment time or MU limits, and radiobiologic effects.​

Dosimetric Objectives, such as dose volume constraints, minimum or maximum dose, etc., can be used to specify dose goals for​ anatomical or other treatment volumes that are referenced by Conceptual Volumes. Other Dosimetric Objectives can also be used​ to specify general plan optimization objectives not related to anatomical or other treatment volumes, such as Meterset Minimization,​ etc.​

Table C.36.2.1.4-1. Dosimetric Objective Macro Attributes​

Attribute Name​

Tag​

Type​

Attribute Description​

Dosimetric Objective UID​

(3010,006E)​

1​

A UID by which this Dosimetric Objective can be referenced.​

 

 

 

See Section C.36.2.1.4.1.1.​

Originating SOP Instance​

(3010,0007)​

1C​

Reference to the SOP Instance that contains the original​

Reference Sequence​

 

 

definition of this Dosimetric Objective identified by Dosimetric​

 

 

 

Objective UID (3010,006E).​

 

 

 

Required when the Dosimetric Objective UID (3010,0948) was​

 

 

 

not issued in the current SOP Instance, but read from another​

 

 

 

SOP instance..​

 

 

 

Only a single Item shall be included in this Sequence.​

>Include Table 10-11 “SOP Instance Reference Macro Attributes”​

 

Dosimetric Objective Type​

(3010,006D)​

1​

The type of dose objective which this Item represents.​

Code Sequence​

 

 

Only a single Item shall be included in this Sequence.​

 

 

 

>Include Table 8.8-1 “Code Sequence Macro Attributes”​

DCID 9500 “Dosimetric Objective Types”.​

Dosimetric Objective​

(3010,0070)​

2​

Parameters for the objective identified in Dosimetric Objective​

Parameter Sequence​

 

 

Type Code Sequence (3010,006D).​

Zero or more Items shall be included in this Sequence.​

See Section C.36.2.1.4.1.2.​

>Include Table 10-2 “Content Item Macro Attributes Description”​

- Standard -​

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