DICOM PS3.3 2018a - Information Object Definitions

C.8.8.26 RT Ion Beams Session Record Module
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#### C.8.8.26 RT Ion Beams Session Record Module

Table C.8.8.26-1 specifies the Attributes that describe the measured and recorded settings acquired during Ion Radiation Treatments.

Table C.8.8.26-1. RT Ion Beams Session Record Module Attributes

Attribute Name | Tag | Type | Description
--- | --- | --- | ---
Referenced Fraction Group Number | (300C,0022) | 3 | Identifier of fraction group within referenced RT Ion 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 the machine dosimeter. Enumerated Values: MU Monitor Units NP Number of Particles
Treatment Session Ion Beam Sequence | (3008,0021) | 1 | Sequence of setup and/or treatment beams administered during treatment session. One or more Items shall be included in this Sequence.
>Referenced Beam Number | (300C,0006) | 1 | References Beam specified by Beam Number (300A,00C0) in Ion Beam Sequence (300A,03A2) in RT Ion Beams Module within the referenced RT Ion Plan.
>Beam Name | (300A,00C2) | 1 | User-defined name for Beam. See Section C.8.8.25.1.
>Beam Description | (300A,00C3) | 3 | User-defined description for Beam. See Section C.8.8.25.1.
>Beam Type | (300A,00C4) | 1 | Motion characteristic of 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 Beam. Defined Terms: PHOTON PROTON ION
>Radiation Mass Number | (300A,0302) | 1C | Mass number of radiation. Required if Radiation Type (300A,00C6) is ION
>Radiation Atomic Number | (300A,0304) | 1C | Atomic number of radiation. Required if Radiation Type (300A,00C6) is ION
>Radiation Charge State | (300A,0306) | 1C | Charge state of radiation. Required if Radiation Type (300A,00C6) is ION
>Scan Mode | (300A,0308) | 1 | The method of beam scanning used during treatment. Defined Terms: NONE No beam scanning is performed. UNIFORM Between control points, the beam is scanned to create a uniform lateral fluence distribution across the field. MODULATED Between control points, the beam is scanned to create a modulated lateral fluence distribution across the field. MODULATED_SPEC Between control points, the beam is scanned to create a modulated lateral fluence distribution across the field. The specific scan mode is defined by Modulated Scan Mode Type (300A,0309).
>Modulated Scan Mode Type | (300A,0309) | 1C | Defines the specialization of a modulated scan mode. Defined Terms: STATIONARY The Meterset is delivered while the beam spot is at the specified position. LEAPING The delivery of the specified Meterset for the current spot position begins when the spot is at the previous spot position but the spot moves as quickly as possible to the current specified spot position where most of the Meterset is delivered. LINEAR The beam spot is delivered with uniform flux while traveling from one position to the next position (continuous). MIXED Between control points the beam may be delivered by a combination of STATIONARY, LEAPING or LINEAR modes. Required if Scan Mode (300A,0308) is MODULATED_SPEC. See Section C.8.8.25.8.
>Referenced Tolerance Table Number | (300C,00A0) | 3 | Uniquely identifies Ion Tolerance Table specified by Tolerance Table Number (300A,0042) within Ion Tolerance Table Sequence in RT Ion Tolerance Tables Module. These tolerances are to be used for verification of treatment machine settings.
>Beam Limiting Device Leaf Pairs Sequence | (3008,00A0) | 3 | Sequence of beam limiting device (collimator) jaw or leaf (element) sets. One or more Items are permitted 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 Ion Patient Setup to be used for current beam, specified by Patient Setup Number (300A,0182) within Patient Setup Sequence of RT Patient Setup Module.
>Referenced Verification Image Sequence | (300C,0040) | 3 | Sequence of verification images obtained during delivery of current beam. One or more Items are permitted in this Sequence. See Section C.8.8.14.2.
>>Include Table 10-11 “SOP Instance Reference Macro Attributes” |
>Referenced Measured Dose Reference Sequence | (3008,0080) | 3 | 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 Ion Plan. Required if Referenced Measured Dose Reference Number (3008,0082) is not present.
>>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 present.
>>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 Ion Plan as defined above.
>Referenced Calculated Dose Reference Sequence | (3008,0090) | 3 | 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 Ion Plan. Required if Referenced Calculated Dose Reference Number (3008,0092) is not present.
>>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 present.
>>Calculated Dose Reference Dose Value | (3008,0076) | 1 | Calculated Dose (Gy).
>Number of Wedges | (300A,00D0) | 1 | Number of wedges associated with current beam.
>Recorded Wedge Sequence | (3008,00B0) | 1C | Sequence of treatment wedges. Required if Number of Wedges (300A,00D0) is non-zero. One or more Items shall be included in this Sequence. The number of Items shall be identical to the value of Number of Wedges (300A,00D0).
>>Wedge Number | (300A,00D2) | 1 | Identification number of the Wedges. The value of Wedge Number (300A,00D2) shall be unique within the Beam in which it was created.
>>Wedge Type | (300A,00D3) | 2 | Type of wedge (if any) defined for Beam. Defined Terms: STANDARD standard (static) wedge MOTORIZED single wedge that can be removed from beam remotely. PARTIAL_STANDARD wedge does not extend across the whole field and is operated manually. PARTIAL_MOTORIZ wedge does not extend across the whole field and can be removed from beam remotely.
>>Wedge ID | (300A,00D4) | 3 | User-supplied identifier for Wedge.
>>Accessory Code | (300A,00F9) | 3 | An accessory identifier to be read by a device such as a bar code reader.
>>Wedge Angle | (300A,00D5) | 2 | Nominal wedge angle (degrees).
>>Wedge Orientation | (300A,00D8) | 2 | Orientation of wedge, i.e., orientation of IEC WEDGE FILTER coordinate system with respect to the IEC BEAM LIMITING DEVICE coordinate systems (degrees).
>Number of Compensators | (300A,00E0) | 1 | Number of range compensators associated with current Beam.
>Recorded Compensator Sequence | (3008,00C0) | 1C | Sequence of treatment compensators. Required if Number of Compensators (300A,00E0) is non-zero. One or more Items shall be included in this Sequence. The number of Items shall be identical to the value of Number of Compensators (300A,00E0).
>>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 ID | (300A,00E5) | 3 | User-supplied identifier for compensator.
>>Accessory Code | (300A,00F9) | 3 | An accessory identifier to be read by a device such as a bar code reader.
>Number of Boli | (300A,00ED) | 1 | Number of boli associated with current Beam.
>Referenced Bolus Sequence | (300C,00B0) | 1C | Sequence of boli associated with Beam. Required if Number of Boli (300A,00ED) is non-zero. One or more Items shall be included in this Sequence. The number of Items shall be identical to the value of Number of Boli (300A,00ED).
>>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 in Referenced Structure Set Sequence (300C,0060) in RT General Plan Module.
>>Accessory Code | (300A,00F9) | 3 | An accessory identifier to be read by a device such as a bar code reader.
>Number of Blocks | (300A,00F0) | 1 | Number of shielding blocks associated with Beam.
>Recorded Block Sequence | (3008,00D0) | 1C | Sequence of blocks associated with Beam. Required if Number of Blocks (300A,00F0) is non-zero. One or more Items shall be included in this Sequence. The number of Items shall be identical to the value of Number of Blocks (300A,00F0).
>>Block Tray ID | (300A,00F5) | 3 | User-supplied identifier for block tray.
>>Accessory Code | (300A,00F9) | 3 | An accessory identifier to be read by a device such as a bar code reader.
>>Referenced Block Number | (300C,00E0) | 1 | Uniquely identifies block specified by Block Number (300A,00FC) within Beam referenced by Referenced Beam Number (300C,0006).
>>Block Name | (300A,00FE) | 3 | User-defined name for block.
>Recorded Snout Sequence | (3008,00F0) | 1C | Sequence of Snouts associated with Beam. Required if Snout Sequence (300A,030C) is included in the RT Ion Plan referenced within the Referenced RT Plan Sequence (300C,0002). Only a single Item shall be included in this Sequence.
>>Snout ID | (300A,030F) | 1 | User or machine supplied identifier for Snout.
>>Accessory Code | (300A,00F9) | 3 | An accessory identifier to be read by a device such as a bar code reader.
>Applicator Sequence | (300A,0107) | 1C | Sequence of Applicators associated with Beam. Required if Applicator Sequence (300A,0107) is included in the RT Ion Plan referenced within the Referenced RT Plan Sequence (300C,0002). Only a single Item shall be included in this Sequence.
>>Applicator ID | (300A,0108) | 1 | User or machine supplied identifier for Applicator.
>>Accessory Code | (300A,00F9) | 3 | An accessory identifier to be read by a device such as a bar code reader.
>>Applicator Type | (300A,0109) | 1 | Type of applicator. Defined Terms: ION_SQUARE square ion applicator ION_RECT rectangular ion applicator ION_CIRC circular ion applicator ION_SHORT short ion applicator ION_OPEN open (dummy) ion applicator INTRAOPERATIVE intraoperative (custom) applicator STEREOTACTIC stereotactic 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
>>Source to General Accessory Distance | (300A,0425) | 3 | Radiation source to general accessory distance (in mm) for current accessory.
>Number of Range Shifters | (300A,0312) | 1 | Number of range shifters associated with current beam.
>Recorded Range Shifter Sequence | (3008,00F2) | 1C | Sequence of range shifters recorded with Beam. Required if Number of Range Shifters (300A,0312) is non-zero. One or more Items shall be included in this Sequence. The number of Items shall be identical to the value of Number of Range Shifters (300A,0312).
>>Referenced Range Shifter Number | (300C,0100) | 1 | Uniquely identifies range shifter specified by Range Shifter Number (300A,0316) within Beam referenced by Referenced Beam Number (300C,0006).
>>Range Shifter ID | (300A,0318) | 1 | User or machine supplied identifier for Range Modulator.
>>Accessory Code | (300A,00F9) | 3 | An accessory identifier to be read by a device such as a bar code reader.
>Number of Lateral Spreading Devices | (300A,0330) | 1 | Number of lateral spreading devices associated with current beam.
>Recorded Lateral Spreading Device Sequence | (3008,00F4) | 1C | Sequence of lateral spreading devices associated with Beam. Required if Number of Lateral Spreading Devices (300A,0330) is non-zero. One or more Items shall be included in this Sequence. The number of Items shall be identical to the value of Number of Lateral Spreading Devices (300A,0330).
>>Referenced Lateral Spreading Device Number | (300C,0102) | 1 | Uniquely identifies lateral spreading device specified by Lateral Spreading Device Number (300A,0334) within Beam referenced by Referenced Beam Number (300C,0006).
>>Lateral Spreading Device ID | (300A,0336) | 1 | User or machine supplied identifier for Lateral Spreading Device.
>>Accessory Code | (300A,00F9) | 3 | An accessory identifier to be read by a device such as a bar code reader.
>Number of Range Modulators | (300A,0340) | 1 | Number of range modulators associated with current beam.
>Recorded Range Modulator Sequence | (3008,00F6) | 1C | Sequence of range modulators associated with Beam. Required if Number of Range Modulators (300A,0340) is non-zero. One or more Items shall be included in this Sequence. The number of Items shall be identical to the value of Number of Range Modulators (300A,0340).
>>Referenced Range Modulator Number | (300C,0104) | 1 | Uniquely identifies range modulator specified by Range Modulator Number (300A,0344) within Beam referenced by Referenced Beam Number (300C,0006).
>>Range Modulator ID | (300A,0346) | 1 | User or machine supplied identifier for Range Modulator.
>>Accessory Code | (300A,00F9) | 3 | An accessory identifier to be read by a device such as a bar code reader.
>>Range Modulator Type | (300A,0348) | 1 | Type of Range Modulator. Defined Terms: FIXED fixed modulation width and weights using ridge filter or constant speed wheel with constant beam current WHL_FIXEDWEIGHTS selected wheel/track (Range Modulator ID) is spinning at constant speed. Modulation width is adjusted by switching constant beam current on and off at wheel steps indicated by Range Modulator Interrupt Values WHL_MODWEIGHTS selected wheel/track (Range Modulator ID) is spinning at constant speed. Weight per wheel step is adjusted by modulating beam current according to selected Beam Current Modulation ID (300A,034C) Only one item in the Recorded Range Modulator Sequence (3008,00F6) can have a Range Modulator Type (300A,0348) of WHL_MODWEIGHTS.
>>Beam Current Modulation ID | (300A,034C) | 1C | User-supplied identifier for the beam current modulation pattern. Required if Range Modulator Type (300A,0348) is WHL_MODWEIGHTS
>Include Table C.8.8.28-1 “Patient Support Identification Macro Attributes” |
>Fixation Light Azimuthal Angle | (300A,0356) | 3 | Azimuthal angle (degrees) of the fixation light coordinate around IEC PATIENT SUPPORT Y-axis. Used for eye treatments. See Section C.8.8.25.6.4.
>Fixation Light Polar Angle | (300A,0358) | 3 | Polar angle (degrees) of the fixation light coordinate. Used for eye treatments. See Section C.8.8.25.6.4.
>Fixation Eye | (300A,0150) | 3 | The eye used for fixation. Enumerated Values: L left eye R right eye
>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 (the source of radiation is specified by Radiation Type (300A,00C6)) TRMT_PORTFILM portal image acquisition with treatment port (the source of radiation is specified by Radiation Type (300A,00C6)) CONTINUATION continuation of interrupted treatment SETUP no treatment beam was 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 were 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 in units specified by Primary Dosimeter Unit (300A,00B3). See Section C.8.8.26.1.
>Specified Secondary Meterset | (3008,0033) | 3 | Desired machine setting of secondary Meterset. See Section C.8.8.26.1.
>Delivered Primary Meterset | (3008,0036) | 3 | Machine setting actually delivered as recorded by primary Meterset in units specified by Primary Dosimeter Unit (300A,00B3). See Section C.8.8.26.1.
>Delivered Secondary Meterset | (3008,0037) | 3 | Machine setting actually delivered as recorded by secondary Meterset. See Section C.8.8.26.1.
>Specified Treatment Time | (3008,003A) | 3 | Treatment Time set (sec).
>Delivered Treatment Time | (3008,003B) | 3 | Treatment Time actually delivered (sec).
>Delivered Depth Dose Parameters Sequence | (300A,0506) | 3 | Set of parameters describing the depth dose distribution. Only a single item is permitted in this sequence.
>>Delivered Reference Dose Definition | (300A,0511) | 1 | Definition of the 100% delivered reference dose level. See Section C.8.8.25.9.
>>Delivered Distal Depth | (300A,0508) | 1 | Penetration depth in water (mm) of the delivered particle excluding any user-installed range modifying devices, measured at the Delivered Distal Depth Fraction (300A,0507). See Section C.8.8.25.9.
>>Delivered Distal Depth Fraction | (300A,0507) | 1 | Fraction of the value of dose relative to the 100% level defined by Delivered Reference Dose Definition (300A,0511). This determines the Delivered Distal Depth (300A,0508). A value of 1.0 refers to 100% of the reference dose level defined by the Delivered Reference Dose Definition (300A,0511). See Section C.8.8.25.9.
>>Delivered Nominal Range Modulated Region Depths | (300A,0510) | 1C | The depths of the proximal and distal limits of the range modulated region in water. Contains two values (in mm). The first value defines the depth of the proximal limit. The second value defines the depth of the distal limit. Required if Delivered Reference Dose Definition (300A,0511) has the value CENTER. See Section C.8.8.25.9.
>>Delivered Nominal Range Modulation Fractions | (300A,0509) | 1C | Delivered Fractions of the Delivered Reference Dose Definition (300A,0511) defining the proximal and distal limits at which the range-modulated region is defined. Contains two values. The first value defines the modulation fraction value at the proximal limit and the second value defines the modulation fraction value at the distal limit. A value of 1.0 refers to the 100% reference dose level as defined in Delivered Reference Dose Definition (300A,0511). Required if Delivered Nominal Range Modulated Region Depths (300A,0510) is present. See Section C.8.8.25.9.
>Number of Control Points | (300A,0110) | 1 | Number of control points in Beam.
>Ion Control Point Delivery Sequence | (3008,0041) | 1 | Sequence of beam control points for current ion treatment beam. One or more Items shall be included in this Sequence. The number of Items shall be identical to the value of Number of Control Points (300A,0110). See Section C.8.8.21.1.
>>Referenced Control Point Index | (300C,00F0) | 1 | Uniquely identifies Control Point specified by Control Point Index (300A,0112) within the 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 in units specified by Primary Dosimeter Unit (300A,00B3).
>>Delivered Meterset | (3008,0044) | 1 | Machine setting actually delivered at current control point in units specified by Primary Dosimeter Unit (300A,00B3).
>>Meterset Rate Set | (3008,0045) | 3 | The specified speed of delivery of the specified dose in units specified by Primary Dosimeter Unit (300A,00B3) per minute.
>>Meterset Rate Delivered | (3008,0046) | 3 | The delivered speed of delivery of the specified dose in units specified by Primary Dosimeter Unit (300A,00B3) per minute.
>>Nominal Beam Energy | (300A,0114) | 1C | Nominal Beam Energy at control point in MeV per nucleon. Defined at nozzle entrance before all Beam Modifiers. Required for Control Point 0 of Ion Control Point Delivery Sequence (3008,0041) or if Nominal Beam Energy (300A,0114) changes during beam administration, and KVP (0018,0060) is not present.
>>KVP | (0018,0060) | 1C | Peak kilo voltage output of the setup X-Ray generator used. Required for Control Point 0 of Ion Control Point Delivery Sequence (3008,0041), or if kVp changes during setup, and Nominal Beam Energy (300A,0114) is not present.
>>Ion Wedge Position Sequence | (300A,03AC) | 1C | Sequence of Wedge positions for current control point. Required for first item of Ion Control Point Sequence if Number of Wedges (300A,00D0) is non-zero, and in subsequent control points if Wedge Position (300A,0118) or Wedge Thin Edge Position (300A,00DB) changes during beam. One or more Items shall be included in this Sequence. The number of Items shall be identical to the value of Number of Wedges (300A,00D0).
>>>Referenced Wedge Number | (300C,00C0) | 1 | Uniquely references Wedge described by Wedge Number (300A,00D2) in Wedge Sequence (300A,00D1).
>>>Wedge Position | (300A,0118) | 1 | Position of Wedge at current control point. Enumerated Values: IN OUT
>>>Wedge Thin Edge Position | (300A,00DB) | 1C | Closest distance from the central axis of the beam along a wedge axis to the thin edge as projected to the machine isocentric plane (mm). Value is positive is the wedge does not cover the central axis, negative if it does. Required if Wedge Type (300A,00D3) of the wedge referenced by Referenced Wedge Number (300C,00C0) is PARTIAL_STANDARD or PARTIAL_MOTORIZ. See Section C.8.8.25.6.4.
>>Include Table C.8.8.27-1 “Beam Limiting Device Position Macro Attributes” |
>>Range Shifter Settings Sequence | (300A,0360) | 1C | Sequence of Range Shifter settings for the current control point. One or more Items shall be included in this Sequence. Required for Control Point 0 of Ion Control Point Delivery Sequence (3008,0041) or if Range Shifter Setting (300A,0362) changes during beam administration, and Number of Range Shifters (300A,0312) is non-zero.
>>>Referenced Range Shifter Number | (300C,0100) | 1 | Uniquely references Range Shifter described by Range Shifter Number (300A,0316) in Range Shifter Sequence (300A,0314).
>>>Range Shifter Setting | (300A,0362) | 1 | Machine specific setting attribute for the range shifter. The specific encoding of this value should be documented in a Conformance Statement. See Section C.8.8.25.5.
>>Lateral Spreading Device Settings Sequence | (300A,0370) | 1C | Sequence of Lateral Spreading Device settings for the current control point. One or more Items shall be included in this Sequence. Required for Control Point 0 of Ion Control Point Delivery Sequence (3008,0041) or if Lateral Spreading Device Setting (300A,0372) changes during beam administration, and Number of Lateral Spreading Devices (300A,0330) is non-zero.
>>>Referenced Lateral Spreading Device Number | (300C,0102) | 1 | Uniquely references Lateral Spreading Device described by Lateral Spreading Device Number (300A,0334) in Lateral Spreading Device Sequence (300A,0332).
>>>Lateral Spreading Device Setting | (300A,0372) | 1 | Machine specific setting attribute for the lateral spreading device. The specific encoding of this value should be documented in a Conformance Statement. See Section C.8.8.25.5.
>>Range Modulator Settings Sequence | (300A,0380) | 1C | Sequence of Range Modulator Settings for current control point. One or more Items shall be included in this Sequence. Required for Control Point 0 of Ion Control Point Delivery Sequence (3008,0041), or if Range Modulator Settings change during beam administration, and Number of Range Modulators (300A,0340) is non-zero.
>>>Referenced Range Modulator Number | (300C,0104) | 1 | Uniquely references Range Modulator described by Range Modulator Number (300A,0344) in Range Modulator Sequence (300A,0342).
>>>Range Modulator Gating Start Value | (300A,0382) | 1C | Start position defines the range modulator position at which the beam is switched on. Required if Range Modulator Type (300A,0348) of the range modulator referenced by Referenced Range Modulator Number (300C,0104) is WHL_MODWEIGHTS or WHL_FIXEDWEIGHTS
>>>Range Modulator Gating Stop Value | (300A,0384) | 1C | Stop position defines the range modulator position at which the beam is switched off. Required if Range Modulator Type (300A,0348) of the range modulator referenced by Referenced Range Modulator Number (300C,0104) is WHL_MODWEIGHTS or WHL_FIXEDWEIGHTS
>>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 Ion Control Point Delivery Sequence (3008,0041) 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 Ion Control Point Delivery Sequence (3008,0041), or if Gantry Rotation Direction changes during beam administration. Enumerated Values: CW clockwise CC counter-clockwise NONE no rotation
>>Gantry Pitch Angle | (300A,014A) | 2C | Gantry Pitch Angle. 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 Direction | (300A,014C) | 2C | Direction of Gantry Pitch Angle when viewing along the positive X-axis of the IEC GANTRY coordinate system, for segment following Control Point. Required for first item of Control Point Sequence, or if Gantry Pitch 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 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 Ion Control Point Delivery Sequence (3008,0041) or if beam limiting device (collimator) angle changes during beam administration.
>>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 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 Positions | (300A,0392) | 1C | Number of spot positions used to specify scanning pattern for current 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 the Number of Scan Spot Positions (300A,0392). See Section C.8.8.25.8.
>>Scan Spot Metersets Delivered | (3008,0047) | 1C | A set of Meterset values delivered to the scan spot positions. The order 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).
>>Scanning Spot Size | (300A,0398) | 3 | The Scanning Spot Size as calculated using the Full Width Half Maximum (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 Position Map (300A,0394) and Scan Spot Meterset Weights (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 Indices | (300A,0391) | 1C | The indices of the prescribed spots corresponding to each delivered spot. 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 Point Delivery Sequence (3008,0041) 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 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 | 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). 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 Direction | (300A,0142) | 2C | 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. Required for first item of Control Point Sequence, 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 Direction | (300A,0146) | 2C | 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. Required for first item of Control Point Sequence, 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 head fixation angle is the same direction as positive Table Top Pitch. See Section C.8.8.25.6.4.
>>Chair Head Frame Position | (300A,0151) | 3 | A device-specific value that specifies the relationship between the chair 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 This value is not intended to be used for geometric calculations, however, for the same device, the relative distance is meaningful. Typically used for eye treatments.
>>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 Ion Control Point Delivery Sequence (3008,0041) 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 Ion Control Point Delivery Sequence (3008,0041) 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 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 elements such as blocks, MLC and/or compensators). Required for Control Point 0 of Ion Control Point Delivery Sequence (3008,0041) or if Snout Position changes during beam administration.
>>Corrected Parameter Sequence | (3008,0068) | 3 | Introduces a sequence of items describing 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 Ion Beam Sequence (3008,0021) and all nested sequences therein.
>>>Parameter Item Index | (3008,0063) | 1 | Contains the ones-based sequence item index 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 Pointer | (3008,0061) | 1 | Contains the Data Element Tag of the parent sequence containing the attribute that was overriden. The value is limited in scope to the Treatment Session Ion Beam Sequence (3008,0021) and all nested sequences therein.
>>>Override Parameter Pointer | (3008,0062) | 1 | Contains the Data Element Tag of the attribute that was overridden.
>>>Parameter Item Index | (3008,0063) | 1 | Contains the ones-based sequence item index 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 Number | (3008,0067) | 3 | Positive integer identifying which value of a multi-valued attribute identified 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 Sequence | (0008,1072) | 3 | Identification of the operator who authorized override. Only a single Item 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).

### Note

Recording an extra tuning spot is considered reordering, even if the spots were delivered in the prescribed order. If re-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.

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DICOM PS3.3 2018a - Information Object Definitions