| DICOM PS3.3 2016a - Information Object Definitions |
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The RT Brachy Application Setups Module describes the application of a brachytherapy radiotherapy treatment. It contains one or more sources, each associated with one or more Channels. A Channel is a device by which a source is placed in its intended treatment position or positions. A Channel may consist of a Source Applicator plus a Transfer Tube, a Source Applicator alone, a rigid or flexible linear source, or a seed. A number of Channels (for example applicators, sources or seeds) are generally arranged in an Application Setup, which may be considered a "logical" device. It is important not to confuse Application Setup with Applicator. The model used here has been primarily built around the concept of remote afterloading, but extended to support other brachytherapy applications such as manual applicators and molds, seeds, and sources. Additional devices that are not Channels are described as Brachy Accessory Devices. Examples of Accessory Devices include shields that modify the dose distribution from all sources in the treatment. However, Channel shields modify the dose only for the source(s) in that Channel.
The data in the module are arranged as follows:
Table C.8-51. RT Brachy Application Setups Module Attributes
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Type of brachytherapy treatment technique. See Section C.8.8.15.1. |
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Introduces single item sequence describing treatment machine to be used for treatment delivery. |
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User-defined name identifying treatment machine to be used for treatment delivery. |
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Manufacturer of the equipment to be used for treatment delivery. |
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Institution where the equipment is located that is to be used for treatment delivery. |
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Mailing address of the institution where the equipment is located that is to be used for treatment delivery. |
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Department in the institution where the equipment is located that is to be used for treatment delivery. |
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Manufacturer's model name of the equipment that is to be used for treatment delivery. |
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Manufacturer's serial number of the equipment that is to be used for treatment delivery. |
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Sequence of Sources to be used within Application Setups. One or more Items shall be included in this Sequence. |
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Identification number of the Source. The value of Source Number (300A,0212) shall be unique within the RT Plan in which it is created. |
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Identifier for the Source Instance. Identifies the actual source instance of the source, to which Source Strength Reference Date (300A,022C) and Source Strength Reference Time (300A,022E) refer. |
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Identifier for the Source Model. Identifies the model, the source instance belongs to. |
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User-supplied identifier for encapsulation material of active Source. |
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Nominal thickness of wall of encapsulation (mm). See Section C.8.8.15.12. |
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Nominal transmission through wall of encapsulation (between 0 and 1). See Section C.8.8.15.12 |
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Measurement unit of Source Strength. Required if the source is not a gamma-emitting (photon) source. May be present otherwise. |
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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. |
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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. |
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Reference date for Reference Air Kerma Rate (300A,022A) or Source Strength (300A,022B) of Isotope. |
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Reference time for Air Kerma Rate (300A,022A) or Source Strength (300A,022B) of Isotope. |
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Identification number of the Application Setup. The value of Application Setup Number (300A,0234) shall be unique within the RT Plan in which it is created. |
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Identification number of the Template. The value of Template Number (300A,0240) shall be unique within the Application Setup in which it is created. |
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Sequence of reference images used for validation of current Application Setup. |
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>>Include Table 10-11 “SOP Instance Reference Macro Attributes” |
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Total Reference Air Kerma for current Application Setup, i.e., the product of Air Kerma Rate of all Sources in all Channels with their respective Channel Times (µGy at 1 m). Value shall be zero for non-gamma sources. |
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Sequence of Brachy Accessory Devices associated with current Application Setup. |
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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. |
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User or machine supplied identifier for Brachy Accessory Device. |
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User-supplied identifier for material of Brachy Accessory Device. See Note. |
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Nominal thickness of Brachy Accessory Device (mm). See Section C.8.8.15.12. |
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Nominal Transmission through Brachy Accessory Device (between 0 and 1). See Section C.8.8.15.12. |
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Uniquely identifies ROI representing the Brachy Accessory specified by ROI Number (3006,0022) in Structure Set ROI Sequence (3006,0020) in Structure Set Module within RT Structure Set referenced by Referenced RT Structure Set Sequence (300C,0060) in RT General Plan Module. See Section C.8.8.15.2. |
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Identification number of the Channel. The value of Channel Number (300A,0282) shall be unique within the Application Setup in which it is created. |
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Length of Channel (mm). See Section C.8.8.15.3. |
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Total amount of time between first and final Control Points of the Brachy Control Point Sequence (300A,02D0) for current Channel (sec). Channel Total Time calculation is based upon the Reference Air Kerma Rate (300A,022A) of the Referenced Source Number (300C,000E). |
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Type of Source movement. See Section C.8.8.15.4. |
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Number of Pulses per fraction for current Channel. Required if Brachy Treatment Type (300A,0202) is PDR. |
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Pulse repetition interval (sec) for current Channel. Required if Brachy Treatment Type (300A,0202) is PDR. |
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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. |
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User or machine supplied identifier for Source Applicator. Required if Source Applicator Number (300A,0290) is sent. |
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Type of Source Applicator. Required if Source Applicator Number (300A,0290) is sent. |
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Length of Source Applicator (mm), defined as the distance between the connector of the applicator and the distal-most position of the source. Required if Source Applicator Number (300A,0290) is sent. |
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User-supplied identifier for material of Source Applicator wall. See Note. |
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Nominal Thickness of Source Applicator wall (mm). See Section C.8.8.15.12. |
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Nominal Transmission through Source Applicator wall (between 0 and 1). See Section C.8.8.15.12. |
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Distance of path along channel (in mm) between adjacent (potential) dwell positions. Required if Source Movement Type (300A,0288) is STEPWISE. |
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Uniquely identifies ROI representing the Source Applicator specified by ROI Number (3006,0022) in Structure Set ROI Sequence (3006,0020) in Structure Set Module within RT Structure Set referenced by Referenced RT Structure Set Sequence (300C,0060) in RT General Plan Module. Required if Source Applicator Number (300A,0290) is sent. See Section C.8.8.15.2. |
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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. |
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Length of Transfer Tube of current afterloading Channel (mm). Required if value Transfer Tube Number (300A,02A2) is non-null. |
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Sequence of Channel Shields associated with current Channel. One or more Items are permitted in this Sequence. See Section C.8.8.15.5. |
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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. |
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User-supplied identifier for material of Channel Shield. See Note. |
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Nominal Thickness of Channel Shield (mm). See Section C.8.8.15.12. |
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Nominal Transmission of Channel Shield (between 0 and 1). See Section C.8.8.15.12. |
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Uniquely identifies ROI representing the Channel Shield specified by ROI Number (3006,0022) in Structure Set ROI Sequence (3006,0020) in Structure Set Module within RT Structure Set referenced by Referenced RT Structure Set Sequence (300C,0060) in RT General Plan Module. See Section C.8.8.15.2. |
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Uniquely identifies the referenced Source within Source Sequence (300A,0210) for current Application Setup. |
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Number of control points in Channel. For an N-segment Channel there will be 2N (stepwise movement) or N+1 (continuous movement) control points. |
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Value of Cumulative Time Weight (300A,02D6) for final Control Point in Brachy Control Point Sequence (300A,02D0). Required if Cumulative Time Weight (300A,02D6) is non-null in Control Points specified within Brachy Control Point Sequence (300A,02D0). See Section C.8.8.15.6. |
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Sequence of machine configurations describing this Channel. Two or more Items shall be included in this Sequence. See Section C.8.8.15.7. |
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Index of current Control Point, starting at 0 for first Control Point. |
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Cumulative time weight to current Control Point (where the weighting is proportional to time values delivered). Cumulative Time Weight for first item in Brachy Control Point Sequence (300A,02D0) is always zero. See Section C.8.8.15.6 and Section C.8.8.15.8. |
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Distance between current Control Point Position and the distal-most possible Source position in current Channel (mm). See Section C.8.8.15.9. |
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Coordinates (x, y, z) of Control Point in the patient based coordinate system described in Section C.7.6.2.1.1 (mm). See Section C.8.8.15.10. |
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(x,y,z) component of the direction vector of the brachy source or seed at the Control Point 3D Position (300A,02D4). See Section C.8.8.15.14. |
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Introduces a sequence of Dose References for current Channel. |
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Uniquely identifies Dose Reference described in Dose Reference Sequence. (300A,0010) within RT Prescription Module of current RT Plan. |
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Coefficient used to calculate cumulative dose contribution from this Source to the referenced Dose Reference at the current Control Point. See Section C.8.8.15.11. |
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Material ID (300A,00E1) may also be specified within a referenced ROI, if an ROI is used to describe the object.
In permanent implant techniques the value for Channel Total Time (300A,0286) shall be mean life time of the isotope. The Brachy Control Point Sequence (300A,02D0) shall consist of two items: the first having Cumulative Time Weight (300A,02D6) = 0 and the second having Cumulative Time Weight (300A,02D6) = Final Cumulative Time Weight (300A,02C8).
| DICOM PS3.3 2016a - Information Object Definitions |
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