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[Optimized 3-D planning by simple means. An example].

S Richter·M Flentje·J Richter
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Abstract

AIM: A treatment technique favorable for linacs with asymmetric jaws, which combines cranio-caudal matching fields with fields enclosing the whole target volume, is investigated with respect to field matching and sparing of normal tissue and organs at risk. PATIENT AND METHODS: For a pelvic target volume rapidly varying in cranio-caudal direction a 5-field technique was planned with individually weighted and blocked fields. Three fields adjoining in cranio-caudal direction were completed by 2 fields enclosing the whole target volume. The matching line was measured and calculated with Helax TMS. Furthermore a 4-field box and opposing fields were planned. The dose-volume histograms for target, bladder, intestine and soft tissue were exported. Normal tissue complication probability and tumor control probability, respectively, were calculated for all techniques. RESULTS: In the region of the matching line the summation of the measured normalized curves resulted in relative dose maxima of 6.0% (caudal) and 4.5% (cranial), respectively. For fields enclosing the whole target volume the dose maxima in the region of the matching line decreased to 2.0% (caudal) and 1.8% (cranial), respectively. For the dose profiles calculated with Helax TMS no overdose was found. The 5-field technique with adjoining fields results in a better sparing of the organs at risk compared to the other techniques, whereas the tumor control remains the same. CONCLUSIONS: In specific cases a technique with cranio-caudal adjoining fields can be recommended with respect to sparing of normal tissue and organs at risk.

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HumansImage Processing, Computer-AssistedNeoplasmsPelvisPhantoms, ImagingRadiotherapy DosageRadiotherapy Planning, Computer-AssistedRadiotherapy, Computer-AssistedEnglish AbstractJournal Article

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S Richter, M Flentje, J Richter. 2000. [Optimized 3-D planning by simple means. An example].. https://doi.org/10.1007/s000660050016

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