Target volume delineation variation in radiotherapy for early stage rectal cancer in the Netherlands
- Nijkamp, Jasper
- de Haas-Kock, Danielle F. M.
- Beukema, Jannet C.
- Neelis, Karen J.
- Woutersen, Dankert
- Ceha, Heleen
- Rozema, Tom
- Slot, Annerie
- Vos-Westerman, Hanneke
- Intven, Martijn
- Spruit, Patty H.
- van der Linden, Yvette
- Geijsen, Debby
- Verschueren, Karijn
- van Herk, Marcel B.
- Marijnen, Corrie A. M.
DOIAbstract
Purpose: The aim of this study was to measure and improve the quality of target volume delineation by means of national consensus on target volume definition in early-stage rectal cancer. Methods and materials: The CTV's for eight patients were delineated by 11 radiation oncologists in 10 institutes according to local guidelines (phase 1). After observer variation analysis a workshop was organized to establish delineation guidelines and a digital atlas, with which the same observers re-delineated the dataset (phase 2). Variation in volume, most caudal and cranial slice and local surface distance variation were analyzed. Results: The average delineated CTV volume decreased from 620 to 460 cc (p <0.001) in phase 2. Variation in the caudal CTV...
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