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The Effect of Inaccuracy of MLC Leaf Position against Dose Distribution on VMAT Delivery Technique using EGSnrc Monte Carlo Simulation
Dirgayussa I.G.E.a, Yani S.b, Pratama D.c, Rhani M.F.d, Soh R.C.X.e, Haryanto F.b
a Department of Electrical Engineering, Institut Teknologi Del, Toba-Samosir, Indonesia
b Department of Physics, Institut Teknologi Bandung, Bandung, Indonesia
c Departement of Physics, Politeknik Negeri Bandung, Bandung, Indonesia
d Department of Radiology, Concord International Hospital Singapore, Singapore, Singapore
e Department of Radiology, Tan Tock Seng Hospital Singapore, Singapore, Singapore
[vc_row][vc_column][vc_row_inner][vc_column_inner][vc_separator css=”.vc_custom_1624529070653{padding-top: 30px !important;padding-bottom: 30px !important;}”][/vc_column_inner][/vc_row_inner][vc_row_inner layout=”boxed”][vc_column_inner width=”3/4″ css=”.vc_custom_1624695412187{border-right-width: 1px !important;border-right-color: #dddddd !important;border-right-style: solid !important;border-radius: 1px !important;}”][vc_empty_space][megatron_heading title=”Abstract” size=”size-sm” text_align=”text-left”][vc_column_text]© 2018 IEEE. A Monte Carlo simulation on VMAT delivery technique has implemented to investigate the effect of inaccuracy of MLC leaf position between the plan and the actual of MLC leaf position. The study aim to compare the dose distributions between these two parameters. In general, these studies divided into two stages, commissioning of head Linac and simulation of the VMAT delivery technique. At the commissioning stage, Monte Carlo simulation on PDD and dose profile for field size 6 × 6 cm 2 , 10 × 10 cm2 and 20 × 20 cm 2 was validating by experimental data. Commissioning results showed a good agreement between the simulation and experimental data. The 6.4 MeV initial incident electrons were used with an average deviation less than 5% for all field size. In the VMAT delivery technique simulation stage, an analysis of DynaLog file using homemade MATLAB program is used and generated the input files for DOSXYZnrc. One dimension of dose profile analyzed at some point sampling to determine differences in the dose distribution in the cylinder acrylic phantom. DynaLog analysis on the data file showed that the leaf error position is less than 1 mm is 97.1% of the total leaf position and no leaf error position is more than 2 mm. The doses distribution error was discovered less than 2% at isocenter. This study showed there is no significant error on doses distribution due to <1% inaccuracy of MLC leaf position. The Monte Carlo simulation was done using 24.7 billion particles of the phase space history file with a standard deviation of Monte Carlo calculations by 31.66%.[/vc_column_text][vc_empty_space][vc_separator css=".vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}"][vc_empty_space][megatron_heading title="Author keywords" size="size-sm" text_align="text-left"][vc_column_text]Delivery techniques,DynaLog files,EGSnrc,EGSnrc Monte Carlo,Incident electrons,Leaf position,Monte Carlo calculation,Standard deviation[/vc_column_text][vc_empty_space][vc_separator css=".vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}"][vc_empty_space][megatron_heading title="Indexed keywords" size="size-sm" text_align="text-left"][vc_column_text]DynaLog files,EGSnrc,Monte Carlo Simulation,Plan and Actual MLC leaf position[/vc_column_text][vc_empty_space][vc_separator css=".vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}"][vc_empty_space][megatron_heading title="Funding details" size="size-sm" text_align="text-left"][vc_column_text]ACKNOWLEBDGMENT This study was fully supported by Institute for Research and Community Services (LPPM) Institut Teknologi Del, Toba Samosir, North Sumatera.[/vc_column_text][vc_empty_space][vc_separator css=".vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}"][vc_empty_space][megatron_heading title="DOI" size="size-sm" text_align="text-left"][vc_column_text]https://doi.org/10.1109/IBIOMED.2018.8534813[/vc_column_text][/vc_column_inner][vc_column_inner width=”1/4″][vc_column_text]Widget Plumx[/vc_column_text][/vc_column_inner][/vc_row_inner][/vc_column][/vc_row][vc_row][vc_column][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][/vc_column][/vc_row]