DICOM PS3.3 2020a - Information Object Definitions

C.8.8.22 RT Brachy Session Record Module (Current)
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#### C.8.8.22 RT Brachy Session Record Module

Table C.8-58. RT Brachy 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.
Brachy Treatment Technique | (300A,0200) | 1 | Type of brachytherapy treatment technique. Enumerated Values: INTRALUMENARY INTRACAVITARY INTERSTITIAL CONTACT INTRAVASCULAR PERMANENT See RT Plan IOD.
Brachy Treatment Type | (300A,0202) | 1 | Type of brachytherapy treatment. Defined Terms: MANUAL Manually positioned HDR High dose rate MDR Medium dose rate LDR Low dose rate PDR Pulsed dose rate
Recorded Source Sequence | (3008,0100) | 1 | Sequence of Sources to be used within Application Setups. One or more Items shall be included in this Sequence.
>Source Number | (300A,0212) | 1 | Identification number of the Source. The value of Source Number (300A,0212) shall be unique within the Recorded Source Sequence (3008,0100) in which it is created.
>Source Type | (300A,0214) | 1 | Type of Source. Defined Terms: POINT LINE CYLINDER SPHERE
>Source Model ID | (300A,021B) | 3 | User-supplied identifier for the radioactive source model that was used for the source in the treatment plan of which this session record is based to. See Section C.8.8.15.15.
>Source Manufacturer | (300A,0216) | 2 | Manufacturer of source.
>Source Serial Number | (3008,0105) | 2 | Serial Number of source.
>Source Isotope Name | (300A,0226) | 1 | User-defined name of Isotope.
>Source Isotope Half Life | (300A,0228) | 1 | Half-life of Isotope (days).
>Source Strength Units | (300A,0229) | 1C | Measurement unit of Source Strength. Required if the source is not a gamma-emitting (photon) source. May be present otherwise. Enumerated Values: AIR_KERMA_RATE Air Kerma Rate if Source is Gamma emitting Isotope. DOSE_RATE_WATER Dose Rate in Water if Source is Beta emitting Isotope.
>Reference Air Kerma Rate | (300A,022A) | 1 | Air Kerma Rate in air of Isotope specified at Source Strength Reference Date (300A,022C) and Source Strength Reference Time (300A,022E) (in µGy h-1 at 1 m). Value shall be zero for non-gamma sources.
>Source Strength | (300A,022B) | 1C | Source Strength of Isotope at Source Strength Reference Date (300A,022C) and Source Strength Reference Time (300A,022E), in units specified in Source Strength Units (300A,0229). Required if the source is not a gamma-emitting (photon) source. See Section C.8.8.15.13.
>Source Strength Reference Date | (300A,022C) | 1 | Reference date for Reference Air Kerma Rate (300A,022A) or Source Strength (300A,022B) of Isotope.
>Source Strength Reference Time | (300A,022E) | 1 | Reference time for Air Kerma Rate (300A,022A) or Source Strength (300A,022B) of Isotope.
Treatment Session Application Setup Sequence | (3008,0110) | 1 | Sequence of Application Setups for RT Treatment Record for current RT Plan. One or more Items shall be included in this Sequence.
>Application Setup Type | (300A,0232) | 1 | Type of Application Setup. Defined Terms: FLETCHER_SUIT DELCLOS BLOEDORN JOSLIN_FLYNN CHANDIGARH MANCHESTER HENSCHKE NASOPHARYNGEAL OESOPHAGEAL ENDOBRONCHIAL SYED_NEBLETT ENDORECTAL PERINEAL
>Referenced Brachy Application Setup Number | (300C,000C) | 3 | References application setup specified by Application Setup Number (300A,0234) in Application Setup Sequence (300A,0230) in RT Brachy Application Setups Module within referenced RT Plan.
>Application Setup Name | (300A,0236) | 3 | User-defined name for Application Setup.
>Application Setup Manufacturer | (300A,0238) | 3 | Manufacturer of Application Setup.
>Template Number | (300A,0240) | 3 | Identification number of the Template.
>Template Type | (300A,0242) | 3 | User-defined type for Template Device.
>Template Name | (300A,0244) | 3 | User-defined name for Template Device.
>Application Setup Check | (3008,0116) | 3 | Results of check-wire travel through all channels of current Application Setup. Enumerated Values: PASSED Passed check FAILED Failed check UNKNOWN Unknown status
>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 Note.
>>Include Table 10-11 “SOP Instance Reference Macro Attributes” |
>Total Reference Air Kerma | (300A,0250) | 1 | Total Reference Air Kerma for current Application Setup, i.e., the sum of the products of the Air Kerma Rates of each Source in each Channel with its respective Channel Time (µGy at 1 m). Value shall be zero for non-gamma sources.
>Referenced Measured Dose Reference Sequence | (3008,0080) | 3 | Sequence of doses measured during treatment delivery, summed over entire session. 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 present. 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 present. 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 | Sequence of doses estimated for each treatment delivery. One or more Items are permitted in this Sequence.
>>Referenced Dose Reference Number | (300C,0051) | 1 | 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 present. It shall not be present otherwise.
>>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. It shall not be present otherwise.
>>Calculated Dose Reference Dose Value | (3008,0076) | 1 | Calculated Dose (Gy).
>Current Fraction Number | (3008,0022) | 2 | Fraction number for this application setup.
>Treatment Delivery Type | (300A,00CE) | 2 | Delivery Type of treatment. Defined Terms: TREATMENT normal patient treatment CONTINUATION continuation of interrupted 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 for other than NORMAL condition 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
>Recorded Brachy Accessory Device Sequence | (3008,0120) | 3 | Sequence of Brachy Accessory Devices associated with current Application Setup. One or more Items are permitted in this Sequence.
>>Referenced Brachy Accessory Device Number | (3008,0122) | 2 | Identification number of the Brachy Accessory Device. The value of Brachy Accessory Device Number (300A,0262) shall be unique within the Application Setup in which it is created.
>>Brachy Accessory Device ID | (300A,0263) | 2 | User or machine supplied identifier for Brachy Accessory Device.
>>Brachy Accessory Device Type | (300A,0264) | 1 | Type of Brachy Accessory Device. Defined Terms: SHIELD DILATATION MOLD PLAQUE FLAB
>>Brachy Accessory Device Name | (300A,0266) | 3 | User-defined name for Brachy Accessory Device.
>Recorded Channel Sequence | (3008,0130) | 1 | Sequence of Channels for current Application Setup. One or more Items shall be included in this Sequence.
>>Channel Number | (300A,0282) | 1 | Identification number of the Channel. The value of Channel Number (300A,0282) shall be unique within the Application Setup in which it is created.
>>Referenced Channel Number | (0074,1406) | 3 | The channel to be delivered, specified by the value of Channel Number (300A,0282) in referenced RT Plan.
>>Channel Length | (300A,0284) | 2 | Length of Channel (mm). See RT Plan IOD.
>>Channel Effective Length | (300A,0271) | 3 | Length of Channel (in mm) defined as the distance between the connector on the afterloader and the center of the distal-most possible position of the source. See Section C.8.8.15.16.
>>Channel Inner Length | (300A,0272) | 2C | The total physical inner length of channel (in mm). Specifies the distance between the connector on the afterloader and the end of the channel. Required if Channel Effective Length (300A,0271) is present. See Section C.8.8.15.16.1.
>>Afterloader Channel ID | (300A,0273) | 3 | Identification of the Channel connection on the afterloader. See Section C.8.8.15.16.2.
>>Specified Channel Total Time | (3008,0132) | 1 | Total amount of time in seconds, scaled for the current source delivery strength and other delivery factors, specified to be delivered at the time of treatment between the first Control Point and the final Control Point for the current Channel. In the case of resuming a partially delivered treatment, the Specified Channel Total time will only include the remainder to be treated. See Section C.8.8.22.2.
>>Delivered Channel Total Time | (3008,0134) | 1 | Total amount of time in seconds actually delivered between Control Point 0 and final Control Point of the Brachy Control Point Delivered Sequence (3008,0160) for current Channel.
>>Source Movement Type | (300A,0288) | 1 | Type of Source movement. Defined Terms: STEPWISE FIXED OSCILLATING UNIDIRECTIONAL
>>Specified Number of Pulses | (3008,0136) | 1C | Number of Pulses specified per fraction for current Channel. Required if Brachy Treatment Type (300A,0202) is PDR. See Section C.8.8.22.1.
>>Delivered Number of Pulses | (3008,0138) | 1C | Number of Pulses actually delivered per fraction for current Channel. Required if Brachy Treatment Type (300A,0202) is PDR. See Section C.8.8.22.1.
>>Specified Pulse Repetition Interval | (3008,013A) | 1C | Pulse repetition interval (sec) specified for current Channel. Required if Brachy Treatment Type (300A,0202) is PDR. See Section C.8.8.22.1
>>Delivered Pulse Repetition Interval | (3008,013C) | 1C | Pulse repetition interval (sec) actually delivered for current Channel. Required if Brachy Treatment Type (300A,0202) is PDR. See Section C.8.8.22.1.
>>Referenced Measured Dose Reference Sequence | (3008,0080) | 3 | Sequence of doses measured during treatment delivery, summed over entire session. 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 present. It shall not be present otherwise.
>>>Referenced Measured Dose Reference Number | (3008,0082) | 1C | 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. It shall not be present otherwise.
>>>Measured Dose Value | (3008,0016) | 1 | Measured Dose.
>>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 Plan. Required if Referenced Calculated Dose Reference Number (3008,0092) is not present. It shall not be present otherwise.
>>>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. It shall not be present otherwise.
>>>Calculated Dose Reference Dose Value | (3008,0076) | 1 | Calculated Dose (Gy).
>>Recorded Source Applicator Sequence | (3008,0140) | 3 | Sequence of recorded Source Applicators. One or more Items are permitted in this Sequence.
>>>Referenced Source Applicator Number | (3008,0142) | 2 | Identification number of the Source Applicator. The value of Source Applicator Number (300A,0290) shall be unique within the Channel in which it is created.
>>>Source Applicator ID | (300A,0291) | 2 | User or machine supplied identifier for Source Applicator.
>>>Source Applicator Type | (300A,0292) | 1 | Type of Source Applicator. Defined Terms: FLEXIBLE RIGID
>>>Source Applicator Name | (300A,0294) | 3 | User-defined name for Source Applicator.
>>>Source Applicator Length | (300A,0296) | 1 | Length of Source Applicator (mm), defined as the distance between the connector of the applicator and the distal-most position of the source.
>>>Source Applicator Tip Length | (300A,0274) | 2C | Length of Source Applicator Tip (in mm), defined as the distance between the outer tip of the applicator and the center of the distal-most possible position of the source. Required if Channel Effective Length (300A,0271) is present. See Section C.8.8.15.16.
>>>Source Applicator Manufacturer | (300A,0298) | 3 | Manufacturer of Source Applicator.
>>>Source Applicator Step Size | (300A,02A0) | 1C | Distance of path along channel (mm) between adjacent (potential) dwell positions. Required if Source Movement Type (300A,0288) is STEPWISE.
>>Transfer Tube Number | (300A,02A2) | 2 | Identification number of the Transfer Tube. The value of Transfer Tube Number (300A,02A2) shall be unique within the Channel in which it is created.
>>Transfer Tube Length | (300A,02A4) | 2C | Length of Transfer Tube of current afterloading Channel (mm). Required if value Transfer Tube Number (300A,02A2) is not zero length.
>>Recorded Channel Shield Sequence | (3008,0150) | 3 | Sequence of Channel Shields associated with current Channel. One or more Items are permitted in this Sequence. See RT Plan IOD for description of Channel Shields.
>>>Referenced Channel Shield Number | (3008,0152) | 2 | Identification number of the Channel Shield. The value of Channel Shield Number (300A,02B2) shall be unique within the Channel in which it is created.
>>>Channel Shield ID | (300A,02B3) | 2 | User or machine supplied identifier for Channel Shield.
>>>Channel Shield Name | (300A,02B4) | 3 | User-defined name for Channel Shield.
>>Referenced Source Number | (300C,000E) | 1 | Uniquely identifies the referenced Source within the Recorded Source Sequence (3008,0100) for current Application Setup.
>>Safe Position Exit Date | (3008,0162) | 1C | Date on which the source(s) exited the safe. Required if Recorded Channel Sequence (3008,0130) is present and Brachy Treatment Type (300A,0202) is not MANUAL or PDR.
>>Safe Position Exit Time | (3008,0164) | 1C | Time on which the source(s) exited the safe. Required if Recorded Channel Sequence (3008,0130) is present and Brachy Treatment Type (300A,0202) is not MANUAL or PDR.
>>Safe Position Return Date | (3008,0166) | 1C | Date on which the source(s) returned to the safe. Required if Recorded Channel Sequence (3008,0130) is present and Brachy Treatment Type (300A,0202) is not MANUAL or PDR.
>>Safe Position Return Time | (3008,0168) | 1C | Time on which the source(s) returned to the safe. Required if Recorded Channel Sequence (3008,0130) is present and Brachy Treatment Type (300A,0202) is not MANUAL or PDR.
>>Number of Control Points | (300A,0110) | 1 | Number of control points in Channel. For an N-segment Channel there will be 2N (stepwise movement) or N+1 (continuous movement) control points.
>>Brachy Control Point Delivered Sequence | (3008,0160) | 1 | Sequence of machine configurations describing this Channel. The number of Items in this Sequence shall equal the value of Number of Control Points (300A,0110). See RT Plan IOD and Section C.8.8.22.1 for description of Brachy Control Point Delivered Sequence.
>>>Referenced Control Point Index | (300C,00F0) | 3 | Index of current Control Point, starting at 0 for first Control Point.
>>>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.
>>>Control Point Relative Position | (300A,02D2) | 1 | Distance in mm between current Control Point Position and the center of the distal-most possible Source position in current Channel. See RT Plan IOD.
>>>Override Sequence | (3008,0060) | 3 | Sequence of parameters that were overridden during the administration of the treatment 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.
>>>>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).
>>Pulse Specific Brachy Control Point Delivered Sequence | (3008,0171) | 3 | Brachy Control Point Delivered Sequence for each PDR treatment pulse. Number of Items in the Sequence shall be equal to the Delivered Number of Pulses (3008,0138).
>>>Pulse Number | (3008,0172) | 1 | Identification Number of this delivered Pulse. The pulse numbers for a treatment start at 1 and increase monotonically by 1. A given SOP instance might only contain some of the pulses of the given treatment.
>>>Safe Position Exit Date | (3008,0162) | 1 | Date on which the source(s) exited the safe.
>>>Safe Position Exit Time | (3008,0164) | 1 | Time at which the source(s) exited the safe.
>>>Safe Position Return Date | (3008,0166) | 1 | Date on which the source(s) returned to the safe.
>>>Safe Position Return Time | (3008,0168) | 1 | Time at which the source(s) returned to the safe.
>>>Brachy Pulse Control Point Delivered Sequence | (3008,0173) | 1 | List of control points for this pulse. See Section C.8.8.22.1.
>>>>Referenced Control Point Index | (300C,00F0) | 3 | Index of current Control Point, starting at 0 for first Control Point in this Sequence.
>>>>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.
>>>>Control Point Relative Position | (300A,02D2) | 1 | Distance in mm between current Control Point Position and the center of the distal-most possible Source position in current Channel. See Section C.8.8.15.9.
>>>>Override Sequence | (3008,0060) | 3 | Parameters which were overridden during the administration of the treatment immediately prior to the current control point. One or more Items are permitted in this Sequence.
>>>>>Override Parameter Pointer | (3008,0062) | 2 | Data Element Tag of the Attribute that was overridden.
>>>>>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.

### Note

The Referenced Verification Image Sequence (300C,0040) may contain either images taken specifically for verification of the brachy application setup or reference images used in place of verification images, as might be done in HDR treatment planning.

##### C.8.8.22.1 PDR (Pulsed Dose Rate) Treatment

In Brachytherapy treatment techniques where Brachy Treatment Type (300A,0202) is PDR, the Brachy Control Point Sequence (300A,02D0) shall consist of 2N Items, where N = Delivered Number of Pulses (3008,0138). Each control point pair shall represent a single pulse and consist of the first control point of the pulse and the last control point of the pulse.

The Brachy Pulse Control Point Delivered Sequence (3008,0173) is consistent with the Brachy Control Point Delivered Sequence (3008,0160) as defined in the enclosing Recorded Channel Sequence (3008,0130) except all control points delivered are listed in this Sequence as opposed to listing only the start and end control points in the Brachy Control Point Delivered Sequence (3008,0160).

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DICOM PS3.3 2020a - Information Object Definitions