C.8.8.21 RT Beams Session Record Module

Table C.8-57—RT BEAMS SESSION RECORD MODULE ATTRIBUTES

Attribute Name Tag Type Attribute Description
Referenced Fraction Group Number (300C,0022) 3 Identifier of Fraction Group within referenced RT Plan.
Number of Fractions Planned (300A,0078) 2 Total number of treatments (Fractions) planned for current Fraction Group.
Primary Dosimeter Unit (300A,00B3) 1 Measurement unit of machine dosimeter. Enumerated Values: MU = Monitor Unit MINUTE = minute
Treatment Session Beam Sequence (3008,0020) 1 Introduces sequence of Beams administered during treatment session. One or more Items shall be included in this sequence.
>Referenced Beam Number (300C,0006) 3 References Beam specified by Beam Number (300A,00C0) in Beam Sequence (300A,00B0) in RT Beams Module within referenced RT Plan.
>Beam Name (300A,00C2) 3 User-defined name for delivered Beam.
>Beam Description (300A,00C3) 3 User-defined description for delivered Beam.
>Beam Type (300A,00C4) 1 Motion characteristic of delivered Beam. Enumerated Values: STATIC = all beam parameters remain unchanged during delivery DYNAMIC = one or more beam parameters changes during delivery
>Radiation Type (300A,00C6) 1 Particle type of delivered Beam. Defined Terms: PHOTON, ELECTRON, NEUTRON, PROTON.
>Primary Fluence Mode Sequence (3002,0050) 3 Sequence defining whether the primary fluence of the treatment beam used a non-standard fluence-shaping when the beam was delivered. Only a single item is permitted in this sequence.
>>Fluence Mode (3002,0051) 1 Describes whether the fluence shaping is the standard mode for the beam or an alternate. Enumerated Values: STANDARD = Uses standard fluence-shaping NON_STANDARD = Uses a non-standard fluence-shaping mode
>>Fluence Mode ID (3002,0052) 1C Identifier for the specific fluence-shaping mode. Required if Fluence Mode (3002,0051) has value NON_STANDARD.
>High-Dose Technique Type (300A,00C7) 1C Type of high-dose treatment technique. Defined Terms: NORMAL = Standard treatment TBI = Total Body Irradiation HDR = High Dose Rate Required if treatment technique requires a dose that would normally require overriding of treatment machine safety controls.
>Referenced Verification Image Sequence (300C,0040) 3 Introduces sequence of verification images obtained during delivery of current beam. One or more Items are permitted in this sequence.
>>Include ‘SOP Instance Reference Macro' Table 10-11
>>Start Meterset (3008,0078) 3 Cumulative Meterset Weight within Beam referenced by Referenced Beam Number at which image acquisition starts.
>>End Meterset (3008,007A) 3 Cumulative Meterset Weight within Beam referenced by Referenced Beam Number at which image acquisition ends.
>Referenced Measured Dose Reference Sequence (3008,0080) 3 Introduces sequence of doses measured during treatment delivery for current Beam. One or more Items are permitted in this sequence.
>>Referenced Dose Reference Number (300C,0051) 1C Uniquely references Dose Reference specified by Dose Reference Number (300A,0012) in Dose Reference Sequence (300A,0010) in RT Prescription Module of referenced RT Plan. Required if Referenced Measured Dose Reference Number (3008,0082) is not sent. It shall not be present otherwise.
>>Referenced Measured Dose Reference Number (3008,0082) 1C Uniquely references Measured Dose Reference specified by Measured Dose Reference Number (3008,0064) in Measured Dose Reference Sequence (3008,0010). Required if Referenced Dose Reference Number (300C,0051) is not sent. It shall not be present otherwise.
>>Measured Dose Value (3008,0016) 1 Measured Dose in units specified by Dose Units (3004,0002) in sequence referenced by Measured Dose Reference Sequence (3008,0010) or Dose Reference Sequence (300A,0010) in RT Prescription Module of referenced RT Plan as defined above.
>Referenced Calculated Dose Reference Sequence (3008,0090) 3 Introduces sequence of doses estimated for each treatment delivery. One or more Items are permitted in this sequence.
>>Referenced Dose Reference Number (300C,0051) 1C Uniquely identifies Dose Reference specified by Dose Reference Number (300A,0012) in Dose Reference Sequence (300A,0010) in RT Prescription Module of referenced RT Plan. Required if Referenced Calculated Dose Reference Number (3008,0092) is not sent.
>>Referenced Calculated Dose Reference Number (3008,0092) 1C Uniquely identifies Calculated Dose Reference specified by Calculated Dose Reference Number (3008,0072) within Calculated Dose Reference Sequence (3008,0070). Required if Referenced Dose Reference Number (300C,0051) is not sent.
>>Calculated Dose Reference Dose Value (3008,0076) 1 Calculated Dose (Gy).
>Source-Axis Distance (300A,00B4) 3 Radiation source to gantry rotation axis distance of the equipment that was used for beam delivery (mm).
>Beam Limiting Device Leaf Pairs Sequence (3008,00A0) 1 Introduces sequence of beam limiting device (collimator) jaw or leaf (element) leaf pair values. One or more Items shall be included in this sequence.
>>RT Beam Limiting Device Type (300A,00B8) 1 Type of beam limiting device (collimator). Enumerated Values: X = symmetric jaw pair in IEC X direction Y = symmetric jaw pair in IEC Y direction ASYMX = asymmetric jaw pair in IEC X direction ASYMY = asymmetric pair in IEC Y direction MLCX = multileaf (multi-element) jaw pair in IEC X direction MLCY = multileaf (multi-element) jaw pair in IEC Y direction
>>Number of Leaf/Jaw Pairs (300A,00BC) 1 Number of leaf (element) or jaw pairs (equal to 1 for standard beam limiting device jaws).
>Referenced Patient Setup Number (300C,006A) 3 Uniquely identifies Patient Setup used within current beam, specified by Patient Setup Number (300A,0182) within Patient Setup Sequence (300A,0180) of RT Treatment Record.
>Number of Wedges (300A,00D0) 1 Number of wedges associated with current delivered Beam.
>Recorded Wedge Sequence (3008,00B0) 1C Introduces sequence of treatment wedges present during delivered Beam. Required if Number of Wedges (300A,00D0) is non-zero. One or more Items shall be included in this sequence.
>>Wedge Number (300A,00D2) 3 Identification number of the Wedge. The value of Wedge Number (300A,00D2) shall be unique within the wedge sequence.
>>Wedge Type (300A,00D3) 2 Type of wedge defined for delivered Beam. Defined Terms: STANDARD = standard (static) wedge DYNAMIC = moving Beam Limiting Device (collimator) jaw simulating wedge MOTORIZED = single wedge which can be removed from beam remotely
>>Wedge ID (300A,00D4) 3 User-supplied identifier for wedge.
>>Accessory Code (300A,00F9) 3 An identifier for the accessory intended to be read by a device such as a bar-code reader.
>>Wedge Angle (300A,00D5) 3 Nominal wedge angle delivered (degrees).
>>Wedge Orientation (300A,00D8) 3 Orientation of wedge, i.e. orientation of IEC WEDGE FILTER coordinate system with respect to IEC BEAM LIMITING DEVICE coordinate system (degrees).
>Number of Compensators (300A,00E0) 2 Number of compensators associated with current delivered Beam.
>Recorded Compensator Sequence (3008,00C0) 3 Introduces sequence of treatment compensators associated with current Beam. One or more Items are permitted in this sequence.
>>Referenced Compensator Number (300C,00D0) 1 Uniquely identifies compensator specified by Compensator Number (300A,00E4) within Beam referenced by Referenced Beam Number (300C,0006).
>>Compensator Type (300A,00EE) 2 Type of compensator (if any). Defined Terms: STANDARD = physical (static) compensator DYNAMIC = moving Beam Limiting Device (collimator) simulating compensator
>>Compensator ID (300A,00E5) 3 User-supplied identifier for compensator.
>>Accessory Code (300A,00F9) 3 An identifier for the accessory intended to be read by a device such as a bar-code reader.
>Number of Boli (300A,00ED) 2 Number of boli used with current Beam.
>Referenced Bolus Sequence (300C,00B0) 3 Introduces sequence of boli associated with Beam. One or more Items are permitted in this sequence.
>>Referenced ROI Number (3006,0084) 1 Uniquely identifies ROI representing the bolus specified by ROI Number (3006,0022) in Structure Set ROI Sequence (3006,0020) in Structure Set Module within RT Structure Set IOD referenced by referenced RT Plan in Referenced RT Plan Sequence (300C,0002) in RT General Treatment Record Module.
>>Bolus ID (300A,00DC) 3 User-supplied identifier for the Bolus.
>>Accessory Code (300A,00F9) 3 An identifier for the accessory intended to be read by a device such as a bar-code reader.
>Number of Blocks (300A,00F0) 2 Number of shielding blocks or Electron Inserts associated with Beam.
>Recorded Block Sequence (3008,00D0) 3 Introduces sequence of blocks associated with current Beam. One or more Items are permitted in this sequence.
>>Block Tray ID (300A,00F5) 3 User-supplied identifier for block tray or Electron Insert.
>>Accessory Code (300A,00F9) 3 An identifier for the accessory intended to be read by a device such as a bar-code reader.
>>Referenced Block Number (300C,00E0) 3 Uniquely identifies block specified by Block Number (300A,00FC) within Beam referenced by Referenced Beam Number (300C,0006).
>>Block Name (300A,00FE) 2 User-defined name for block.
>Applicator Sequence (300A,0107) 3 Introduces sequence of Applicators associated with Beam. Only a single item is permitted in this sequence.
>>Applicator ID (300A,0108) 1 User or machine supplied identifier for Applicator.
>>Accessory Code (300A,00F9) 3 An identifier for the accessory intended to be read by a device such as a bar-code reader.
>>Applicator Type (300A,0109) 1 Type of Applicator. Defined Terms: ELECTRON_SQUARE = square electron applicator ELECTRON_RECT = rectangular electron applicator ELECTRON_CIRC = circular electron applicator ELECTRON_SHORT = short electron applicator ELECTRON_OPEN = open (dummy) electron applicator PHOTON_SQUARE = square photon applicator PHOTON _RECT = rectangular photon applicator PHOTON _CIRC = circular photon applicator INTRAOPERATIVE = intraoperative (custom) applicator STEREOTACTIC = stereotactic applicator (deprecated)
>>Applicator Geometry Sequence (300A,0431) 3 Describes the applicator aperture geometry. Only a single Item is permitted in this sequence.
>>>Applicator Aperture Shape (300A,0432) 1 Aperture shape of the applicator. Defined terms: SYM_SQUARE: A square-shaped aperture symmetrical to the central axis. SYM_RECTANGLE: A rectangular-shaped aperture symmetrical to the central axis. SYM_CIRCULAR: A circular-shaped aperture symmetrical to the central axis.
>>>Applicator Opening (300A,0433) 1C Opening (in mm) of the applicator's aperture in IEC BEAM LIMITING DEVICE coordinate system. In case of square-shaped applicator contains the length of the sides of the square. In case of circular-shaped applicators, contains the diameter of the circular aperture. Required if Applicator Aperture Shape (300A,0432) is SYM_SQUARE or SYM_CIRCULAR.
>>>Applicator Opening X (300A,0434) 1C Opening (in mm) of the applicator's aperture in IEC BEAM LIMITING DEVICE coordinate system in X-Direction. Required if Applicator Aperture Shape (300A,0432) is SYM_RECTANGLE.
>>>Applicator Opening Y (300A,0435) 1C Opening (in mm) of the applicator's aperture in IEC BEAM LIMITING DEVICE coordinate system in Y-Direction. Required if Applicator Aperture Shape (300A,0432) is SYM_RECTANGLE.
>> Source to Applicator Mounting Position Distance (300A,0436) 3 Radiation source to applicator mounting position distance (in mm) for current applicator.
>>Applicator Description (300A,010A) 3 User-defined description for Applicator.
>General Accessory Sequence (300A,0420) 3 Introduces a Sequence of General Accessories associated with this Beam. One or more items are permitted in this sequence.
>>General Accessory Number (300A,0424) 1 Identification Number of the General Accessory. The value shall be unique within the sequence.
>>General Accessory ID (300A,0421) 1 User or machine supplied identifier for General Accessory.
>>General Accessory Description (300A,0422) 3 User supplied description of General Accessory.
>>General Accessory Type (300A,0423) 3 Specifies the type of accessory. Defined Terms: GRATICULE = Accessory tray with a radio-opaque grid IMAGE_DETECTOR = Image acquisition device positioned in the beam line RETICLE = Accessory tray with radio-transparent markers or grid
>>Accessory Code (300A,00F9) 3 Machine-readable identifier for this accessory
>Current Fraction Number (3008,0022) 2 Fraction number for this beam administration.
>Treatment Delivery Type (300A,00CE) 2 Delivery Type of treatment. Defined Terms: TREATMENT = normal patient treatment OPEN_PORTFILM = portal image acquisition with open field TRMT_PORTFILM = portal image acquisition with treatment port CONTINUATION = continuation of interrupted treatment SETUP = no treatment beam is applied for this RT Beam. To be used for specifying the gantry, couch, and other machine positions where X-Ray set-up images or measurements are to be taken VERIFICATION = Treatment used for Quality Assurance rather than patient treatment
>Treatment Termination Status (3008,002A) 1 Conditions under which treatment was terminated. Enumerated Values: NORMAL = treatment terminated normally OPERATOR = operator terminated treatment MACHINE = machine terminated treatment UNKNOWN = status at termination unknown
>Treatment Termination Code (3008,002B) 3 Treatment machine termination code. This code is dependent upon the particular application and equipment.
>Treatment Verification Status (3008,002C) 2 Conditions under which treatment was verified by a verification system. Enumerated Values: VERIFIED = treatment verified VERIFIED_OVR = treatment verified with at least one out-of-range value overridden NOT_VERIFIED = treatment verified manually
>Specified Primary Meterset (3008,0032) 3 Desired machine setting of primary meterset.
>Specified Secondary Meterset (3008,0033) 3 Desired machine setting of secondary meterset.
>Delivered Primary Meterset (3008,0036) 3 Machine setting actually delivered as recorded by primary meterset.
>Delivered Secondary Meterset (3008,0037) 3 Machine setting actually delivered as recorded by secondary meterset.
>Specified Treatment Time (3008,003A) 3 Treatment Time set (sec).
>Delivered Treatment Time (3008,003B) 3 Treatment Time actually delivered (sec).
>Number of Control Points (300A,0110) 1 Number of control points delivered.
>Control Point Delivery Sequence (3008,0040) 1 Introduces sequence of beam control points for current treatment beam. One or more Items shall be included in this sequence. See C.8.8.21.1.
>>Referenced Control Point Index (300C,00F0) 3 Uniquely identifies Control Point specified by Control Point Index (300A,0112) within Beam referenced by Referenced Beam Number (300C,0006).
>>Treatment Control Point Date (3008,0024) 1 Date when the delivery of radiation at this control point began. For the final control point this shall be the Date when the previous control point ended.
>>Treatment Control Point Time (3008,0025) 1 Time when the delivery of radiation at this control point began. For the final control point this shall be the Time when the previous control point ended.
>>Specified Meterset (3008,0042) 2 Desired machine setting for current control point. See C.8.8.21.2.
>>Delivered Meterset (3008,0044) 1 Machine setting actually delivered at current control point. See C.8.8.21.2.
>>Dose Rate Set (300A,0115) 2 Dose Rate set on treatment machine for segment beginning at current control point (meterset/min).
>>Dose Rate Delivered (3008,0048) 2 Dose Rate actually delivered for segment beginning at current control point (meterset/min).
>>Nominal Beam Energy (300A,0114) 3 Nominal Beam Energy at control point.
>>Nominal Beam Energy Unit (300A,0015) 1C Units used for Nominal Beam Energy (300A,0114). Required if Nominal Beam Energy (300A,0114) is sent. Defined Terms: MV = Megavolt MEV = Mega electron-Volt If Radiation Type (300A,00C6) is PHOTON, Nominal Beam Energy Unit (300A,0015) shall be MV. If Radiation Type (300A,00C6) is ELECTRON, Nominal Beam Energy Unit (300A,0015) shall be MEV.
>>Wedge Position Sequence (300A,0116) 3 Introduces sequence of Wedge positions for current control point. One or more Items are permitted in this sequence.
>>>Referenced Wedge Number (300C,00C0) 1 Uniquely identifies wedge specified by Wedge Number (300A,00D2) within Beam referenced by Referenced Beam Number (300C,0006).
>>>Wedge Position (300A,0118) 1 Position of Wedge at current control point. Enumerated Values: IN, OUT.
>>Beam Limiting Device Position Sequence (300A,011A) 1C Introduces sequence of beam limiting device (collimator) jaw or leaf (element) positions. One or more Items shall be included in this sequence. Required for Control Point 0 of Control Point Delivery Sequence (3008,0040) or if beam limiting device (collimator) changes during beam administration.
>>>RT Beam Limiting Device Type (300A,00B8) 1 Type of beam limiting device. The value of this attribute shall correspond to RT Beam Limiting Device Type (300A,00B8) defined in an element of Beam Limiting Device Leaf Pairs Sequence (3008,00A0). Enumerated Values: X = symmetric jaw pair in IEC X direction Y = symmetric jaw pair in IEC Y direction ASYMX = asymmetric jaw pair in IEC X direction ASYMY = asymmetric pair in IEC Y direction MLCX = multileaf (multi-element) jaw pair in IEC X direction MLCY = multileaf (multi-element) jaw pair in IEC Y direction
>>>Leaf/Jaw Positions (300A,011C) 1 Positions of beam limiting device (collimator) leaf (element) or jaw pairs (mm) in IEC BEAM LIMITING DEVICE coordinate axis appropriate to RT Beam Limiting Device Type (300A,00B8), e.g. X-axis for MLCX, Y-axis for MLCY. Contains 2N values, where N is the Number of Leaf/Jaw Pairs (300A,00BC) defined in element of Beam Limiting Device Leaf Pairs Sequence (3008,00A0). Values shall be in IEC leaf subscript order 101, 102, … 1N, 201, 202 … 2N.
>>Gantry Angle (300A,011E) 1C Treatment machine gantry angle, i.e. orientation of IEC GANTRY coordinate system with respect to IEC FIXED REFERENCE coordinate system (degrees). Required for Control Point 0 of Control Point Delivery Sequence (3008,0040) or if Gantry Angle changes during beam administration.
>>Gantry Rotation Direction (300A,011F) 1C Direction of Gantry Rotation when viewing gantry from isocenter, for segment beginning at current Control Point. Required for Control Point 0 of Control Point Delivery Sequence (3008,0040), or if Gantry Rotation Direction changes during beam administration. Enumerated Values: CW = clockwise CC = counter-clockwise NONE = no rotation
>>Gantry Pitch Angle (300A,014A) 3 Gantry Pitch Angle. i.e. the rotation of the IEC GANTRY coordinate system about the X-axis of the IEC GANTRY coordinate system (degrees). If used, must be present for first item of Control Point Sequence, or if used and Gantry Pitch Rotation Angle changes during Beam, must be present. See C.8.8.25.6.5.
>>Gantry Pitch Rotation Direction (300A,014C) 3 Direction of Gantry Pitch Angle when viewing along the positive X-axis of the IEC GANTRY coordinate system, for segment following Control Point. If used, must be present for first item of Control Point Sequence, or if used and Gantry Pitch Rotation Direction changes during Beam, must be present. See C.8.8.14.8 and C.8.8.25.6.5. Enumerated Values: CW = clockwise CC = counter-clockwise NONE = no rotation
>>Beam Stopper Position (3008,0230) 3 Position of Beam Stopper during beam administration. Enumerated Values: EXTENDED = Beam Stopper extended RETRACTED = Beam Stopper retracted UNKNOWN = Position unknown
>>Beam Limiting Device Angle (300A,0120) 1C Beam Limiting Device (collimator) angle, i.e. orientation of IEC BEAM LIMITING DEVICE coordinate system with respect to IEC GANTRY coordinate system (degrees). Required for Control Point 0 of Control Point Delivery Sequence (3008,0040) or if beam limiting device (collimator) angle changes during beam delivery.
>>Beam Limiting Device Rotation Direction (300A,0121) 1C Direction of Beam Limiting Device Rotation when viewing beam limiting device (collimator) from radiation source, for segment beginning at current Control Point. Required for Control Point 0 of Control Point Delivery Sequence (3008,0040) or if Beam Limiting Device Rotation Direction changes during beam administration. Enumerated Values: CW = clockwise CC = counter-clockwise NONE = no rotation
>>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 Control Point Delivery Sequence (3008,0040) or if Patient Support Angle changes during beam administration.
>>Patient Support Rotation Direction (300A,0123) 1C Direction of Patient Support Rotation when viewing table from above, for segment beginning at current Control Point. Required for Control Point 0 of Control Point Delivery Sequence (3008,0040), or if Patient Support Rotation Direction changes during beam administration. Enumerated Values: CW = clockwise CC = counter-clockwise NONE = no rotation
>>Table Top Eccentric Axis Distance (300A,0124) 3 Distance (positive) from the IEC PATIENT SUPPORT vertical axis to the IEC TABLE TOP ECCENTRIC vertical axis (mm).
>>Table Top Eccentric Angle (300A,0125) 1C Table Top (non-isocentric) angle, i.e. orientation of IEC TABLE TOP ECCENTRIC coordinate system with respect to IEC PATIENT SUPPORT coordinate system (degrees). Required for Control Point 0 of Control Point Delivery Sequence (3008,0040) or if Table Top Eccentric Angle changes during beam administration.
>>Table Top Eccentric Rotation Direction (300A,0126) 1C Direction of Table Top Eccentric Rotation when viewing table from above, for segment beginning at current Control Point. Required for Control Point 0 of Control Point Delivery Sequence (3008,0040) or if Table Top Eccentric Rotation Direction changes during beam administration. Enumerated Values: CW = clockwise CC = counter-clockwise NONE = no rotation
>>Table Top Pitch Angle (300A,0140) 1C Table Top Pitch Angle, i.e. the rotation of the IEC TABLE TOP coordinate system about the X-axis of the IEC TABLE TOP coordinate system (degrees). If required by treatment delivery device, shall be present for first item of Control Point Sequence. If required by treatment delivery device and if Table Top Pitch Angle changes during Beam, shall be present in all subsequent items of Control Point Sequence. See C.8.8.25.6.2.
>>Table Top Pitch Rotation Direction (300A,0142) 1C Direction of Table Top Pitch Rotation when viewing the table along the positive X-axis of the IEC TABLE TOP coordinate system, for segment following Control Point. If required by treatment delivery device, shall be present for first item of Control Point Sequence. If required by treatment delivery device and if Table Top Pitch Rotation Direction changes during Beam, shall be present in all subsequent items of Control Point Sequence. See C.8.8.14.8 and C.8.8.25.6.2. Enumerated Values: CW = clockwise CC = counter-clockwise NONE = no rotation
>>Table Top Roll Angle (300A,0144) 1C Table Top Roll Angle, i.e. the rotation of the IEC TABLE TOP coordinate system about the IEC Y-axis of the IEC TABLE TOP coordinate system (degrees). If required by treatment delivery device, shall be present for first item of Control Point Sequence. If required by treatment delivery device and if Table Top Roll Angle changes during Beam, shall be present in all subsequent items of Control Point Sequence. See C.8.8.25.6.2.
>>Table Top Roll Rotation Direction (300A,0146) 1C Direction of Table Top Roll Rotation when viewing the table along the positive Y-axis of the IEC TABLE TOP coordinate system, for segment following Control Point. If required by treatment delivery device, shall be present for first item of Control Point Sequence. If required by treatment delivery device and if Table Top Roll Rotation Direction changes during Beam, shall be present in all subsequent items of Control Point Sequence. See C.8.8.14.8 and C.8.8.25.6.2. Enumerated Values: CW = clockwise CC = counter-clockwise NONE = no rotation
>>Table Top Vertical Position (300A,0128) 2C Table Top Vertical position in IEC TABLE TOP coordinate system (mm). This value is interpreted as an absolute, rather than relative, Table setting. Required for Control Point 0 of Control Point Delivery Sequence (3008,0040) or if Table Top Vertical Position changes during beam administration.
>>Table Top Longitudinal Position (300A,0129) 2C Table Top Longitudinal position in IEC TABLE TOP coordinate system (mm). This value is interpreted as an absolute, rather than relative, Table setting. Required for Control Point 0 of Control Point Delivery Sequence (3008,0040) or if Table Top Longitudinal Position changes during beam administration.
>>Table Top Lateral Position (300A,012A) 2C Table Top Lateral position in IEC TABLE TOP coordinate system (mm). This value is interpreted as an absolute, rather than relative, Table setting. Required for Control Point 0 of Control Point Delivery Sequence (3008,0040) or if Table Top Lateral Position changes during beam administration.
>>Corrected Parameter Sequence (3008,0068) 3 Introduces a sequence of items describing any corrections made to any attributes prior to delivery of the next control point. One or more Items are permitted in this sequence.
>>>Parameter Sequence Pointer (3008,0061) 1 Contains the Data Element Tag of the parent sequence containing the attribute that was corrected. The value is limited in scope to the Treatment Session Beam Sequence (3008,0020) and all nested sequences therein.
>>>Parameter Item Index (3008,0063) 1 Contains the sequence item index (starting at 1) of the corrected attribute within its parent sequence.
>>>Parameter Pointer (3008,0065) 1 Contains the Data Element Tag of the attribute that was corrected.
>>>Correction Value (3008,006A) 1 The value applied to the attribute that was referenced by the Parameter Sequence Pointer (3008,0061), Parameter Item Index (3008,0063) and Parameter Pointer (3008,0065).
>>Override Sequence (3008,0060) 3 Introduces 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.
>>>Override Parameter Pointer (3008,0062) 2 Contains the Data Element Tag of the attribute that was overridden.
>>>Parameter Sequence Pointer (3008,0061) 3 Contains the Data Element Tag of the parent sequence containing the attribute that was overridden. The value is limited in scope to the Treatment Session Beam Sequence (3008,0020) and all nested sequences therein.
>>>Parameter Item Index (3008,0063) 3 Contains the sequence item index (monotonically increasing from 1) of the overridden attributes within its parent sequence. The value is limited in scope to the Treatment Session Beam Sequence (3008,0020) and all nested sequences therein.
>>>Operators’ Name (0008,1070) 2 Name of operator who authorized override.
>>>Override Reason (3008,0066) 3 User-defined description of reason for override of parameter specified by Override Parameter Pointer (3008,0062).

C.8.8.21.1 Control point machine delivery parameters

All treatment machine delivery parameters (including table angles and positions) in the RT Treatment Session Record Module shall be specified as absolute, not relative, values at the Control Point.

C.8.8.21.2 Specified and Delivered Meterset Values

C.8.8.21.2.1 Beam Level

The value of Specified Primary Meterset (3008,0032) shall be the value specified by the Beam Meterset (300A,0086) in the corresponding Fraction Group of the referenced RT Plan. The referenced RT Plan is found in the Referenced RT Plan Sequence (300C,0002), and within this plan the Fraction Group is found using the Referenced Fraction Group Number (300C,0022) in this module. The Beam is found in the referenced RT Plan using the Referenced Beam Number (300C,0006) in the same item of the Treatment Session Beam Sequence (3008,0020) as the Specified Primary Meterset (3008,0032).

The value of Delivered Primary Meterset (3008,0036) shall be the accumulated value of the delivered meterset across all Control Points, which is recorded in this item of the Treatment Session Beam Sequence (3008,0020).

Note that, for example, when a partial treatment has occurred and resumption(s) have been delivered which complete delivery of all control points remaining, the sum of the Delivered Primary Meterset (3008,0036) values in all RT Beams Session Records for the beam in question and the fraction being treated will match the specified meterset for the whole fraction.

C.8.8.21.2.2 Control Point Level

Specified Meterset (3008,0042) contains the MU as specified in the corresponding RT Plan at a given control point.

Delivered Meterset (3008,0044) shall contain one of the following three values:

Control points which already have been treated in an earlier session shall contain the Meterset value at which the delivery of the current beam started. Control points which have been completely treated during the current session shall contain the Specified Meterset value for this Control Point. Control Points which have not yet been treated or not completely shall contain the total delivered MU up to the point where the interruption has occurred (i.e. the last control point treated).

This can be expressed by the following equation:

DelMS[CP n ] = MAX ( StartMS, MIN ( SpecMS[CP n ], EndMS ))

with

DelMS[CP n ]: Delivered Meterset value at control point n

SpecMS[CP n ]: Specified Meterset value at control point n

StartMS: Meterset value where delivery of current beam started

EndMS: Meterset value where delivery of current beam ended

By this definition it is unambigously recorded, which ‘segments’ of control points have been delivered in case of partial treatments.

Example 1: 2 Control Points, 2 complete Partial Treatments

Total Meterset: 50

Interruption at: 18 MU

RT Plan:

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RT Treatment Record 1 of 2

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RT Treatment Record 2 of 2

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Example 2: 4 Control Points, 3 complete Partial Treatments

Total Meterset: 50

Interruption at: 25, 30 MU

RT Plan:

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RT Treatment Record 1 of 3

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RT Treatment Record 2 of 3

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RT Treatment Record 3 of 3

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Example 3: 7 Control Points, 2 Partial Treatments with small gap

Total Meterset: 50

Interuption at: 25 MU, Resumption at 30 MU

RT Plan:

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RT Treatment Record 1 of 2

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RT Treatment Record 2 of 2

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