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Poster — Thurs Eve‐05: An assessment of PDDs and outputs predicted by a Monte Carlo‐based treatment planning system for electron beams
Author(s) -
AlDahlawi I,
Evans M,
Reniers B,
Asiev K,
Last J,
Parker W,
DeBlois F
Publication year - 2008
Publication title -
medical physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.473
H-Index - 180
eISSN - 2473-4209
pISSN - 0094-2405
DOI - 10.1118/1.2965924
Subject(s) - eclipse , monte carlo method , computational physics , radiation treatment planning , cathode ray , electron , range (aeronautics) , solar eclipse , beam (structure) , physics , nuclear medicine , optics , materials science , nuclear physics , mathematics , statistics , medicine , radiation therapy , astronomy , composite material
Monte Carlo simulation is currently considered to be the most accurate method of calculating dose distributions for electron beam therapy, and commercial treatment planning software using simplified macro Monte Carlo is available for electron treatment planning. In this work, Eclipse V8.1.18 is being investigated in preparation for the clinical use of CT‐based electron treatment planning. Water tank measurements of percentage depth doses ( PDDs ) and absolute outputs at depth of maximum dose ( Z max ) under different geometric conditions are compared to the results calculated by Eclipse. The measurements are carried out for a range of electron energies (6, 9, 12, and 16 MeV) for the standard open field (10×10 cm 2 ) and for circular cutouts (2, 3, and 6 cm diameters) at SSD of 100 cm. In addition, extended SSDs (105 and 110 cm) and oblique beam incident (gantry 345 degree) for the open field and 3 cm diameter cutout are measured and compared to Eclipse. For PDDs , the results predicted by Eclipse are generally acceptable, falling mostly within 5% of those measured in water. For output, the results predicted by Eclipse are similar, falling mostly within 3% of those measured in water. We observed the greatest differences between Eclipse and measurements near the water surface and in high dose gradients for PDDs . A similar observation is noted for a small field in the case of outputs.