Abstract
Purpose: Comparison of the dosimetric accuracy of the enhanced collapsed cone (eCC) algorithm with the commercially avail-able Monte Carlo (MC) dose calculation for complex treatment techniques. Material and Methods: A total of 8 intensity-modulated radiotherapy (IMRT) and 2 stereotactic body radiotherapy (SBRT) lung cases were calculated with eCC and MC algorithms with the treatment planning systems (TPS) Oncentra MasterPlan 3.2 (Nucle-tron) and Monaco 2.01 (Elekta/CMS). Fluence optimization as well as sequencing of IMRT plans was primarily performed us-ing Monaco. Dose prediction errors were calculated using MC as reference. The dose-volume histrogram (DVH) analysis was complemented with 2D and 3D gamma evaluation. Both algorithms were compared to measurements using the Delta4 system (Scandidos). Results: Recalculated with eCC IMRT plans resulted in lower planned target volume (PTV) coverage, as well as in lower organs-at-risk (OAR) doses up to 8%. Small deviations between MC and eCC in PTV dose (1-2%) were detected for IMRT cases, while larger deviations were observed for SBRT (up to 5%). Conformity indices of both calculations were similar; however, the homogeneity of the eCC calculated plans was slightly better. Delta4 measurements confirmed high dosimetric accuracy of both TPS. Conclusion: Mean dose prediction errors < 3% for PTV suggest that both algorithms enable highly accurate dose calculations under clinical conditions. However, users should be aware of slightly underestimated OAR doses using the eCC algorithm.
Original language | English |
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Pages (from-to) | 433-441 |
Number of pages | 9 |
Journal | Strahlentherapie und Onkologie |
Volume | 187 |
Issue number | 7 |
DOIs | |
Publication status | Published - Jul 2011 |
Externally published | Yes |
Keywords
- Collapsed cone algorithm
- Dose calculation
- IMRT
- Monte Carlo
ASJC Scopus subject areas
- Radiology Nuclear Medicine and imaging
- Oncology