The RT Dose module is used to convey 2D or 3D radiation dose data generated from treatment planning systems or similar devices

這個(gè)屬性支持單個(gè)照射野、或者是一組照射野、或者是一組fraction、或者是一個(gè)完成的治療計(jì)劃的劑量

provides for the inclusion of differential or cumulative dose volume histogram data.

The data contained within this module may supplement dose data in the RT Dose and/or RT Dose ROI modules, or it may be present in the absence of other dose data.

A structure set defines a set of areas of significance. Each area can be associated with a Frame of Reference and zero or more images. Information that can be transferred with each region of interest (ROI) includes geometrical and display parameters, and generation technique.

In general, a ROI can be defined by either a sequence of overlays or a sequence of contours.

This module, if present, is used to define the ROI as a set of contours. Each ROI contains a sequence of one or more contours, where a contour is either a single point (for a point ROI) or more than one point (representing an open or closed polygon).

RT Dose ROI provides ancillary dose-related information to the ROI data defined within the Structure Set and ROI Contour modules, which may be included in the RT Dose IOD composite object. These modules in combination provide for the definition of dose data in the form of isodose curves or named or unnamed dose points. Isodose curves in radiation oncology are simply contours identifying a set of points with the same dose value.

The RT ROI Observations module specifies the identification and interpretation of an ROI specified in the Structure Set and ROI Contour modules

Tolerance Tables may be used to compare planned with delivered machine parameters. If the absolute difference between the planned and delivered values exceeds the Tolerance Table value, treatment may be inhibited or the operator may be warned.

The RT Patient Setup Module contains information describing the positioning of the patient with respect to the treatment machine, along with any fixation devices used. It also describes the shielding devices applied to the patient. The module contains a sequence of patient setup descriptions, each of which may be referenced by one of more beams or brachy application setups.

The RT Fraction Scheme module contains attributes that describe a single or multiple scheme of dose descriptions. Each sequence item contains dose specification information, fractionation patterns, and either beam or brachytherapy application setup specifications. The design of the RT Fraction Scheme module allows a beam or brachytherapy application setup to be used in multiple fraction schemes.

Examples of Fractionation Pattern Schemes:

a) 1 fraction group, 1 fraction per day (Monday to Friday):

Number of Fraction Pattern Digits per Day = 1, Repeat Fraction Cycle Length = 1, Fraction

Pattern = 1111100

b) 2 fraction groups, 1 fraction per day, first fraction group Monday, Wednesday, and Friday,

second fraction group Tuesday and Thursday:

Fraction Group 1: Number of Fraction Pattern Digits Per Day = 1, Repeat Fraction Cycle Length

= 1, Fraction Pattern = 1010100

Fraction Group 2: Number of Fraction Pattern Digits Per Day = 1, Repeat Fraction Cycle Length

= 1, Fraction Pattern = 0101000

c) 2 fraction groups, 1 fraction per day, alternating fraction groups every day of treatment

(Monday to Friday):

Fraction Group 1: Number of Fraction Pattern Digits Per Day = 1, Repeat Fraction Cycle Length

= 2, Fraction Pattern = 10101000101000

Fraction Group 2: Number of Fraction Pattern Digits Per Day = 1, Repeat Fraction Cycle Length

= 2, Fraction Pattern = 01010001010100

d) 1 fraction group, 2 fractions per day (Monday to Friday):

Fraction Group 1: Number of Fraction Pattern Digits Per Day = 2, Repeat Fraction Cycle Length

= 1, Fraction Pattern = 11111111110000

e) 2 fraction groups, 2 fractions per day, alternating fraction groups every treatment (Monday to

Friday):

Fraction Group 1: Number of Fraction Pattern Digits Per Day = 1, Repeat Fraction Cycle Length

= 1, Fraction Pattern = 1111100

Fraction Group 2: Number of Fraction Pattern Digits Per Day = 2, Repeat Fraction Cycle Length

= 1, Fraction Pattern = 11111111110000

The RT Beams Module contains information defining equipment parameters for delivery of external radiation beams.

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 “l(fā)ogical” 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, which 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: 

Treatment Machine Sequence ;treatment machine information (single item)

Source Sequence ;library of sources used in brachy application

Application Setup Sequence  ;one or more applicators, sources, seeds etc

Brachy Accessory Device Sequence ;application level shields etc

Channel Sequence ;applicator, line source(s), seed(s) etc

Channel Shield Sequence ;channel-specific shields

Brachy Control Point Sequence ;mechanism to support individual source dwell times

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.

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 specify the start and end of a single pulse.

The RT Treatment Summary Record IOD may contain references to related RT Treatment Session Record IODs. These references are contained within the Referenced Treatment Record Sequence (3008,0030) of the RT General Treatment Record Module.

The RT Ion Tolerance Tables Module contains information describing the maximum allowed differences between the planned and measured attributes for Ion therpy.

The RT Ion Beams Module contains information defining equipment parameters for delivery of external Ion radiation beams.

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

specify the Beam Limiting Device Sequence.

 identify the Patient Support System.

The RT Beams Delivery Instruction Module contains additional information required by a Treatment Delivery System (TDS) when specifying delivery of an external beam radiotherapy treatment. This information is supplied by a Treatment Management System (TMS) when it creates an RT Beams Delivery Instruction SOP Instance, a composite SOP Instance in turn referenced by a Unified Procedure Step (UPS) in the Unified Procedure Step model.

The RT Beams Delivery Instruction Module consists of a sequence of one or more beam tasks, where each beam task may also specify one or more Delivery Verification images to be acquired prior to, during, or after the treatment delivery.