RTOG Protocol 0236 Plan Scoring Criteria
Target Volume
|
Target Volume Scoring |
|
|
No Variation |
Major Variation |
|
95% of the PTV volume covered by 60 Gy (20Gy/fraction)and |
Failure to achieve No Variation |
|
99% of the PTV volume covered by 54 Gy (18 Gy/fraction) and |
|
|
The dose at the Normalization point (100% prescription point, i.e. COMPTV) should be > 66 Gy (22 Gy/fraction) and < 100 Gy (33 Gy/fraction) |
|
Organs at Risk (OAR)
Critical Organ Dose-Volume Limits
The following table lists maximum dose limits to a point or volume within several critical organs.
Critical Organ Dose-Volume Limits Table
|
Organ |
Volume |
Dose (cGy) |
|
Spinal Cord |
Any point |
18 Gy (6 Gy per fraction) |
|
Esophagus |
Any point |
27 Gy (9 Gy per fraction) |
|
Ipsilateral Brachial Plexus |
24 Gy (8 Gy per fraction) |
|
|
Heart |
Any point |
30 Gy (10 Gy per fraction) |
|
Trachea and Ipsilateral Bronchus |
Any point |
30 Gy (10 Gy per fraction) |
|
Whole Lung (Right & Left) |
(See table below) |
(See table below) |
Any doses to the OARs in excess of the specified dose by more than 2.5% will be scored as a minor deviation. Any doses to the OARs in excess of the specified dose by more than 5% will be considered a major deviation.
The ratio of the prescription isodose volume to the PTV must be no greater than that indicated in the table below.
The ratio of the volume of 50% of the prescription dose (10 Gy per fraction = 30 Gy total) isodose to the volume of the PTV must be no greater than R50% where R50% is given by the table below.
The maximum absolute dose to any point 2 cm from the surface of the PTV in any direction must be no greater than D2cm where D2cm is given by the table below.
The fraction of the entire lung (right and left together minus the GTV and the major bronchi) that receives a total dose of 20 Gy or more must be no greater than V20 where V20 is given by the table below.
|
Maximum PTV Dimension (cm) |
Ratio of Prescription Isodose Volume to the PTV |
Ratio of 50% Prescription Isodose Volume to the PTV, R50% |
Maximum Dose 2 cm from PTV in any Direction, D2cm (Gy) |
Percent of Lung receiving 20 Gy total or more, V20 (%) |
PTV Volume (cc) |
||||
|
Deviation |
Deviation |
Deviation |
Deviation |
||||||
|
none |
minor |
none |
minor |
none |
minor |
none |
minor |
||
|
2.0 |
<1.2 |
1.2-1.4 |
<3.9 |
3.9-4.1 |
<28.1 |
28.1-30.1 |
<10 |
10-15 |
1.8 |
|
2.5 |
<1.2 |
1.2-1.4 |
<3.9 |
3.9-4.1 |
<28.1 |
28.1-30.1 |
<10 |
10-15 |
3.8 |
|
3.0 |
<1.2 |
1.2-1.4 |
<3.9 |
3.9-4.1 |
<28.1 |
28.1-30.1 |
<10 |
10-15 |
7.4 |
|
3.5 |
<1.2 |
1.2-1.4 |
<3.9 |
3.9-4.1 |
<28.1 |
28.1-30.1 |
<10 |
10-15 |
13.2 |
|
4.0 |
<1.2 |
1.2-1.4 |
<3.8 |
3.8-4.0 |
<30.4 |
30.4-32.4 |
<10 |
10-15 |
21.9 |
|
4.5 |
<1.2 |
1.2-1.4 |
<3.7 |
3.7-3.9 |
<32.7 |
32.7-34.7 |
<10 |
10-15 |
33.8 |
|
5.0 |
<1.2 |
1.2-1.4 |
<3.6 |
3.6-3.8 |
<35.1 |
35.1-37.1 |
<10 |
10-15 |
49.6 |
|
5.5 |
<1.2 |
1.2-1.4 |
<3.5 |
3.5-3.7 |
<37.4 |
37.4-41.7 |
<10 |
10-15 |
69.9 |
|
6.0 |
<1.2 |
1.2-1.4 |
<3.3 |
3.3-3.5 |
<39.7 |
39.7-41.7 |
<10 |
10-15 |
95.1 |
|
6.5 |
<1.2 |
1.2-1.4 |
<3.1 |
3.1-3.3 |
<42.0 |
42.0-44.0 |
<10 |
10-15 |
125.8 |
|
7.0 |
<1.2 |
1.2-1.4 |
<2.9 |
2.9-3.1 |
<44.3 |
44.3-46.3 |
<10 |
10-15 |
162.6 |
Note 1: For values of PTV dimension or volume not specified, linear interpolation between table entries is required.
Note 2: Protocol deviations greater than listed here as ‘minor’ will be classified as ‘major’ for protocol compliance.