Evaluation of prototype of improved electron collimation system for Elekta linear accelerators

Journal of Applied Clinical Medical Physics
Garrett M PitcherRobert L Carver

Abstract

This study evaluated a new electron collimation system design for Elekta 6-20 MeV beams, which should reduce applicator weights by 25%-30%. Such reductions, as great as 3.9 kg for the largest applicator, should result in considerably easier handling by members of the radiotherapy team. Prototype 10 × 10 and 20 × 20-cm2 applicators, used to measure weight, in-field flatness, and out-of-field leakage dose, were constructed according to the previously published design with two minor modifications: (a) rather than tungsten, lead was used for trimmer material; and (b) continuous trimmer outer-edge bevel was approximated by three steps. Because of lead plate softness, a 0.32-cm aluminum plate replaced the equivalent lead thickness on the trimmer's downstream surface for structural support. Models of all applicators (6 × 6-25 × 25 cm2 ) with these modifications were inserted into a Monte Carlo (MC) model for dose calculations using 7, 13, and 20 MeV beams. Planar dose distributions were measured and calculated at 1- and 2-cm water depths to evaluate in-field beam flatness and out-of-field leakage dose. Prototype 10 × 10 and 20 × 20-cm2 applicator measurements agreed with calculated weights, in-field flatness, and out-of-field leakage ...Continue Reading

References

Sep 30, 2016·Journal of Applied Clinical Medical Physics·Garrett M PitcherRobert L Carver
Aug 13, 2017·Journal of Applied Clinical Medical Physics·Garrett M PitcherRobert L Carver

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Methods Mentioned

BETA
IEC

Software Mentioned

OmniPro
Elekta
BEAMnrc
MC
DOSXYZnrc

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