DICOM PS3.3 2016c - Information Object Definitions |
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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.
Table C.8-49. RT Fraction Scheme Module Attributes
Identification number of the Fraction Group. The value of Fraction Group Number (300A,0071) shall be unique within the RT Plan in which it is created. |
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Related instances of RT Dose (for grids, isodose curves and named/unnamed point doses). |
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>>Include Table 10-11 “SOP Instance Reference Macro Attributes” |
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Uniquely identifies Dose Reference specified by Dose Reference Number (300A,0012) within Dose Reference Sequence (300A,0010) in RT Prescription Module. |
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Relative importance of satisfying constraint, where high values represent more important constraints. |
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The dose (in Gy) that when reached or exceeded should cause some action to be taken. |
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The maximum dose (in Gy) that can be delivered to the dose reference. |
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Minimum permitted dose (in Gy) to Dose Reference if Dose Reference Type (300A,0020) of referenced Dose Reference is TARGET. |
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Prescribed dose (in Gy) to Dose Reference if Dose Reference Type (300A,0020) of referenced Dose Reference is TARGET. |
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Maximum permitted dose (in Gy) to Dose Reference if Dose Reference Type (300A,0020) of referenced Dose Reference is TARGET. |
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Maximum permitted fraction (in percent) of Target to receive less than the Target Prescription Dose (300A,0027) if Dose Reference Type (300A,0020) of referenced Dose Reference is TARGET and Dose Reference Structure Type (300A,0014) of referenced Dose Reference is VOLUME. |
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Maximum dose (in Gy) to entire Dose Reference if Dose Reference Type (300A,0020) of referenced Dose Reference is ORGAN_AT_RISK and Dose Reference Structure Type (300A,0014) of referenced Dose Reference is VOLUME. |
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Maximum permitted dose (in Gy) to any part of Dose Reference if Dose Reference Type (300A,0020) of referenced Dose Reference is ORGAN_AT_RISK and Dose Reference Structure Type (300A,0014) of referenced Dose Reference is VOLUME. |
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Maximum dose (in Gy) to non-overdosed part of Dose Reference if Dose Reference Type (300A,0020) of referenced Dose Reference is ORGAN_AT_RISK and Dose Reference Structure Type (300A,0014) of referenced Dose Reference is VOLUME. |
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Maximum permitted fraction (in percent) of Organ at Risk to receive more than the Organ at Risk Maximum Dose if Dose Reference Type (300A,0020) of referenced Dose Reference is ORGAN_AT_RISK and Dose Reference Structure Type (300A,0014) of referenced Dose Reference is VOLUME. |
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Total number of treatments (Fractions) prescribed for current Fraction Group. |
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Number of digits in Fraction Pattern (300A,007B) used to represent one day. See Note 2. |
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Number of weeks needed to describe treatment pattern. See Note 2. |
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String of 0's (no treatment) and 1's (treatment) describing treatment pattern. Length of string is 7 x Number of Fraction Pattern Digits Per Day x Repeat Fraction Cycle Length. Pattern shall start on a Monday. See Note 2. |
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Number of Beams in current Fraction Group. If Number of Beams is greater then zero, Number of Brachy Application Setups (300A,00A0) shall equal zero. |
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Sequence of treatment beams in current Fraction Group. One or more Items shall be included in this Sequence. Required if Number of Beams (300A,0080) is greater than zero. |
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Uniquely identifies Beam specified by Beam Number (300A,00C0) within Beam Sequence (300A,00B0) in RT Beams Module or within Ion Beam Sequence (300A,03A2) in RT Ion Beams Module. |
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Coordinates (x,y,z) of point at which Beam Dose is specified in the patient based coordinate system described in Section C.7.6.2.1.1 (mm). See Note 3. |
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Dose (in Gy) at Beam Dose Specification Point (300A,0082) due to current Beam for one treatment fraction. |
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Type of Dose of the Beam Dose (300A,0084). Shall not have the same value as Alternate Beam Dose Type (300A,0092). Required if Alternate Beam Dose (300A,0091) is present. May be present otherwise. |
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Alternate Dose (in Gy) at Beam Dose Specification Point (300A,0082) according to the Alternate Beam Dose Type (300A,0092). |
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Type of Dose of the Alternate Beam Dose (300A,0091). Shall not have the same value as Beam Dose Type (300A,0090). |
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Sequence of Items containing Beam Dose Verification Control Points. |
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The Cumulative Meterset Weight value, at which the beam dose point geometrical parameters apply. |
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Uniquely identifies the Control Point specified by Control Point Index (300A,0112) within Beam referenced by Referenced Beam Number (300C,0006). Required, if the referenced Cumulative Meterset Weight (300A,0134) corresponds to a Control Point in the Control Point Sequence (300A,0111). |
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The average depth (in mm) in the patient along a ray from the source to the dose point specified by the Beam Dose Specification Point (300A,0082) from the current Beam Dose Verification Control Point to the next one. |
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The average radiological depth in mm (water-equivalent depth, taking tissue heterogeneity into account) in the patient along a ray from the source to the dose point specified by the Beam Dose Specification Point (300A,0082) from the current Beam Dose Verification Control Point to the next one. |
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Average Source to patient surface (skin) distance in mm along a ray from the source to the dose point specified by the Beam Dose Specification Point (300A,0082) from the current Beam Dose Verification Control Point to the next one. |
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>>>Average Beam Dose Point Source to External Contour Distance |
Average Source to External Contour distance (mm) including devices associated with the patient anatomy model along a ray from the source to the dose point specified by the Beam Dose Specification Point (300A,0082) from the current Beam Dose Verification Control Point to the next one. |
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Machine setting to be delivered for current Beam, specified in Monitor Units (MU) or minutes as defined by Primary Dosimeter Unit (300A,00B3) (in RT Beams Module) for referenced Beam. See Note 4. |
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Number of Brachy Application Setups in current Fraction Group. If Number of Brachy Application Setups is greater then zero, Number of Beams (300A,0080) shall equal zero. |
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Sequence of treatment Brachy Application Setups in current Fraction Group. Required if Number of Brachy Application Setups (300A,00A0) is greater than zero. One or more Items shall be included in this Sequence. |
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Uniquely identifies Brachy Application Setup specified by Brachy Application Setup Number (300A,0234) within Brachy Application Setup Sequence (300A,0230) in RT Brachy Application Setups Module. |
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Coordinates (x,y,z) of point in the patient based coordinate system described in Section C.7.6.2.1.1 at which Brachy Application Setup Dose (300A,00A4) is specified (mm). |
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Dose (in Gy) at Brachy Application Setup Dose Specification Point (300A,00A2) due to current Brachy Application Setup. |
An RT Dose IOD referenced within the Referenced Dose Sequence (300C,0080) can be used for storing grid-based (pixel) data, isodose curves, and/or individual dose points (with optional dose point names) for the current Fraction Group.
The fractionation pattern does not indicate the actual start of treatment, or the order or timing of fraction delivery. If treatment does not commence as outlined in the pattern, it is the application's responsibility to make any necessary adjustments.
Examples of Fractionation Pattern Schemes:
2 fraction groups, 1 fraction per day, first fraction group Monday, Wednesday, and Friday, second fraction group Tuesday and Thursday:
2 fraction groups, 1 fraction per day, alternating fraction groups every day of treatment (Monday to Friday):
2 fraction groups, 2 fractions per day, alternating fraction groups every treatment (Monday to Friday):
The Beam Dose Specification Point (300A,0082) and Brachy Application Setup Dose Specification Point (300A,00A2) contain the coordinates of the single point used for dose normalization. This point is distinct from the Referenced Dose Reference Sequence (300C,0050) in the RT Beams Module and the Brachy Referenced Dose Reference Sequence (300C,0055) in the RT Brachy Application Setups Module, which are used for plan evaluation and dose tracking.
The Meterset at a given Control Point (see RT Beams Module) is equal to Beam Meterset (300A,0086) multiplied by the Cumulative Meterset Weight (300A,0134) for the Control Point, divided by the Final Cumulative Meterset Weight (300A,010E).
Attribute Referenced Patient Setup Number (300C,006A) was previously defined. Its use in this Module is now retired (see PS3.3-2004).
Attributes Beam Dose Point Depth, Beam Dose Point Equivalent Depth and Beam Dose Point SSD were previously included in this Module as optional Attributes but have been retired. See PS3.3-2011.
The Beam Delivery Duration Limit (300A,00C5) is the maximum time span allowed to deliver a single fraction of a beam to prevent significant over-treatments. Treatment is expected to be terminated upon reaching the Beam Delivery Duration Limit independent of the meterset. This limit represents the expected time span including some increase by a factor greater than 1 to accommodate normal variations in delivery.
The number of items in the Beam Dose Verification Control Point Sequence (300A,008B) is not required to be the same as in the Control Point Sequence (300A,0111). A different sampling can be chosen for the Beam Dose Verification Control Point Sequence, but where the Cumulative Meterset Weight of a Control Point Sequence Item is the same it shall be referenced by the Referenced Control Point Index (300C,00F0).
The values given in Average Beam Dose Point Depth (300A,008D), Average Beam Dose Point Equivalent Depth (300A,008E) and Average Beam Dose Point SSD (300A,008F) shall always contain average values from the current Beam Dose Verification Control Point to the next. In case of e.g., an arc therapy, these values reflect the changing depth parameters. In case these distances do not change, e.g., for a static beam treatment, the average value equals the static value under the given geometric conditions.
DICOM PS3.3 2016c - Information Object Definitions |
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