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KMID : 0357520230460060527
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Journal of Radiological Science and Technology
2023 Volume.46 No. 6 p.527 ~ p.533
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Evaluation of Clinical Risk according to Multi-Leaf Collimator Positioning Error in Spinal Radiosurgery
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Kang Dong?Jin
Oh Geon
Shin Young?Joo
Kang Jin-Kyu
Jung Jae-Yong
Lee Bo-Ram
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Abstract
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The purpose of this study is to evaluate the clinical risk of spinal radiosurgery by calculating the dose difference due to dose calculation algorithm and multi-leaf collimator positioning error. The images acquired by the CT simulator were recalculated by correcting the multi-leaf collimator position in the dose verification program created using MATLAB and applying stoichiometric calibration and Monte Carlo algorithm. With multi-leaf collimator positioning error, the clinical target volume (CTV) showed a dose difference of up to 13% in the dose delivered to the 95% volume, while the gross tumor volume (GTV) showed a dose difference of 9%. The average dose delivered to the total volume showed dose variation from ?8.9% to 9% and ?10.1% to 10.2% for GTV and CTV, respectively. The maximum dose delivered to the total volume of the spinal cord showed a dose difference from ?14.2% to 19.6%, and the dose delivered to the 0.35 ㎤ volume showed a dose difference from ?15.5% to 19.4%. In future research, automating the linkage between treatment planning systems and dose verification programs would be useful for spinal radiosurgery.
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KEYWORD
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Spinal radiosurgery, Multi-leaf collimator positioning error, Stoichiometric calibration, Monte-Carlo algorithm, Dose verification program
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