When treating adenocarinoma of the pancreas to 75 Gy in 25 fractions, what dose constraints do you use for small bowel, large bowel, and stomach?
What are your fields? Do you treat nodes electively?
1 Answer
Mednet MemberInvited Expert
Radiation Oncology · Memorial Sloan Kettering Cancer Center
Answered on · Updated on
|
| Planning Volumes | Definition | Doses by Fractionation Scheme | |
| 15-Fraction | 25-Fraction | |||
|
| Microscopic Extension PTV | CTV + 5mm (CTV = GTV + 1cm + CA, SMA, +/- porta hepatis, +/- splenic hilum basins) | 37.5Gy/15 | 45Gy/25 |
| High Dose PTV | GTV + 5mm margin excluding GI PRV expansion | 67.5Gy/15 | 75Gy/25 | |
| Ultra High Dose PTV* | 1cm contraction of High Dose PTV | 90Gy/15 | 100Gy/25 | |
|
| Stomach-Duodenum PRV | Stomach and duodenum segments 1 and 2 + 3-5mm | Dmax < 45Gy | ...
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