Mike Oliver et al 2008 Phys. Med. Biol. 53 N187 doi:10.1088/0031-9155/53/10/N03
Monte Carlo dose calculation of segmental IMRT delivery to a moving phantom using dynamic MLC and gating log files
Mike Oliver1, Robert Staruch2, Adam Gladwish1, Jeff Craig2, Jeff Chen1,2,3 and Eugene Wong1,2,3,4
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Respiratory gating is emerging as a tool to limit the effect of motion for liver and lung tumors. In order to study the impact of target motion and gated intensity modulated radiation therapy (IMRT) delivery, a computer program was developed to simulate segmental IMRT delivery to a moving phantom. Two distinct plans were delivered to a rigid-motion phantom with a film insert in place under four conditions: static, sinusoidal motion, gated sinusoidal motion with a duty cycle of 25% and gated sinusoidal motion with duty cycle of 50% under motion conditions of a typical patient (A = 1 cm, T = 4 s). The MLC controller log files and gating log files were retained to perform a retrospective Monte Carlo dose calculation of the plans. Comparison of the 2D planar dose distributions between simulation and measurement demonstrated that our technique had at least 94% of the points passing gamma criteria of 3% for dose difference and 3 mm as the distance to agreement. This note demonstrates that the use of dynamic multi-leaf collimator and respiratory monitoring system log files together with a fast Monte Carlo dose calculation algorithm is an accurate and efficient way to study the dosimetric effect of motion for gated or non-gated IMRT delivery on a rigidly-moving body.
- PACS
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87.53.Kn Conformal radiation treatment
- Subjects
- Dates
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Issue 10 (21 May 2008)
Received 7 February 2008, in final form 8 April 2008
Published 30 April 2008
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Monte Carlo dose calculation of segmental IMRT delivery to a moving phantom using dynamic MLC and gating log files
Mike Oliver et al 2008 Phys. Med. Biol. 53 N187
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