Monte Carlo simulation and validation of the multi-leaf collimator of Varian 23EX accelerator / 南方医科大学学报

<p><b>OBJECTIVE</b>To simulate the multi-leaf collimator of Varian linear accelerator using Monte Carlo method.</p><p><b>METHODS</b>The multi-leaf collimator model was established using the DYNVMLC module of BEAMnrc and validated by comparison of Monte Carlo simulation and actual measurement results.</p><p><b>RESULTS</b>The simulation results were well consistent with the actual measurement results with a bias of less than 3%.</p><p><b>CONCLUSION</b>The multi-leaf collimator of Varian linear accelerator can be successfully modeled using Monte Carlo method for analysis of the impact of the geometric properties of the multi-leaf collimator on the dose distribution.</p>

Measurement and calculation of X-ray small fields' data for Varian accelerator / 中华放射肿瘤学杂志

Objective The beam data is compared with those obtained from Monte Carlo (MC)simulation and measurement to investigate their feasibility and reliability for X-ray small fields.MethodsThe beam data,including the total scatter factor (Scp),percentage depth dose (PDD) was acquired byneasurement and calculation with the field size ranging from 0.5 cm × 0.5 cm to 10 cm x 10 cm.The resultswere compared and analyzed.Results All the data is most consistent for the fields size of ≥3.5 cmx 3.5cm,but they are obvious different for the fields size of ≤ 3.0 cm × 3.0 cm.The measurements seem toreliable using the chambers of CC04 and CC13 for the fields size of ≥2.0 cm x 2.0 cm.Conclusions It isdemonstrated that the accurate measurements and calculations of Scp and PDD can be obtained for the fieldssize of ≥2.0 cm ×2.0 cm,but they needed morc rcscarchcs for thc smaller fields.