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Electron dosimetry of angular fields

Royal Marsden NHS Foundation Trust, Fulham Road, London SW3 6JJ, UK

View larger version (14K): [in this window] [in a new window]   Figure 1. Dimensions and angles of(a) cut-out 1, (b) cut-out 2 and (c) cut-out 3 at 1000 mm SSD.

View larger version (19K): [in this window] [in a new window]   Figure 2. Experimental set up for investigating the dose distribution with films.

View larger version (22K): [in this window] [in a new window]   Figure 3. Monte Carlo commissioning of the 9 MeV and 12 MeV electron beams: intercomparison of the depth–dose curves and the profiles. The Monte Carlo values were found to be within 1% of the measured values.

View larger version (89K): [in this window] [in a new window]   Figure 4. Distribution produced from cut-out 1 at 9 MeV and 1000 mm SSD.

View larger version (14K): [in this window] [in a new window]   Figure 5. Percentage depth-dose comparison for (a) cut-out 2 and (b) cut-out 3 for the 12 MeV beam.

View larger version (12K): [in this window] [in a new window]   Figure 6. Comparison of the distance from the angle vertex to 90% isodose for (a) 9 MeV and (b) 12 MeV beam at 1000 mm and 1100 mm SSD.

View larger version (10K): [in this window] [in a new window]   Figure 7. Comparison of the distance from the angle-vertex to 90% isodose for 9 MeV and 12 MeV beam at 1000 mm SSD.

View larger version (18K): [in this window] [in a new window]   Figure 8. Comparison between Monte Carlo and measured values of the distance from the angle vertex to 90% isodose for 9 MeV and 12 MeV beams for 1000 mm SSD.