Comparison of Automatic Beam Angle Optimization and Manual using Intensity Modulated Radiation Therapy Planning in Brain Tumors

Baiq Septika Rufaida, Rinarto Subroto, Heri Sutanto, Wahyu Setia Budi

Abstract


This study aims to determine and analyze the results of planning intensity modulated radiation therapy (IMRT) in cases of brain tumors using conformity index (CI) and homogeneity index (HI) calculations between automatic beam angle optimization (BAO) and manual on IMRT delivery techniques sliding window (SW). The values obtained will then be used to determine the most optimal beam angle in IMRT radiotherapy planning, especially for cases of brain tumors. Nine brain tumor patients underwent IMRT radiotherapy planning using an experimental approach. Brain tumor images are sent to the treatment planning system (TPS) to determine the isocenter, determine energy, determine the number and direction of gantry angles, then IMRT planning is conducted by giving dose volume and priority to organs at risk (OAR) according to QUANTEC used in radiotherapy planning the brain manually, while the automatic technique uses the BAO application. Then the IMRT optimization was conducted with the delivery technique, namely the SW. The results of this study, the CI value of the automatic of (0.970±0.021) is better than the manual technique of (0.941±0.021) with a difference in the percentage value of (p=0.021) is significant, due to the automatic technique of PTV volume ratio which received 98% of the prescription dose is relatively large and the monitor unit (MU) obtained is less than manual technique, but the manual technique is better at protecting OAR. The value of HI using the manual technique of SW method (1.070±0.035) is better than the automatic technique of the SW method of (1.119±0.057) with a difference in the percentage value of (p=0.038) which is significant, due to the range of homogeneity in the manual technique for relatively small volumes than the automatic technique of the maximum dose using PTV parameters and the number of fields used is 5 fields

Keywords


conformity index; homogeneity index; beam angle optimization; intensity modulated radiation therapy; sliding window.

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DOI: http://dx.doi.org/10.52155/ijpsat.v29.2.3763

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