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학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
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연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
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Background: The mid-term performance of clinical linear accelerator (LINAC) during volumetric modulated arc therapy (VMAT) treatment period is not performed in clinical practice and usually replaced with one-time plan quality assurance (QA). In this research we aim to monitor daily reproducibility of VMAT delivery from tracking individual leaf movement error and dosimetric error to evaluate the mid-term quality of the machine used. Materials and Methods: First, multileaf collimator (MLC) information was imported into MATLAB program to determine which of the MLC leaves in the leaf bank had the maximum RMS position error (maxRMS). We estimated where the maximum positional errors (maxPE) of the chosen leaf occur along its path length and tracked its daily variations over the entire treatment period. Secondly, picture information of dosimetric error from portal dosimetry was imported into MATLAB where representative high gamma index region (HGR) was determined as HGR with length of > 1 cm and their centers were daily tracked. Results and Discussion: The maxPEs in the brain and tongue cases were distributed broader than in other cases, but all data were found located within ${\pm}0.5mm$. From first day to last day all of five cases show the similar visual pattern of HGRs and Centers of the longest HGRs remained within ${\pm}1mm$ of that in first day. These findings prove excellent mid-term performance of the LINAC used in VMAT treatments over a full course of treatment. Conclusion: Tracking the daily location changes of leaf movement and dosimetric error can be a good indicator of predicting the daily quality like stability and reproducibility of beam delivering in VMAT treatment.
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참고문헌 (31)
참고문헌 신청
Bruggeman DJ / 2017 / Multi-centre audit of VMAT planning and pre-treatment verification / Radiother. Oncol 124:302~310
Liang B / 2016 / Comparisons of volumetric modulated arc therapy (VMAT) quality assurance (QA) systems:sensitivity analysis to machine errors / Radiat. Oncol 11:146
Sjölin M / 2016 / Incorrect dosimetric leaf separation in IMRT and VMAT treatment planning: Clinical impact and correlation with pretreatment quality assurance / Phys. Medica 32:918~925
Paslera M / 2015 / Linking log files with dosimetric accuracy – A multi-institutional study on quality assurance of volumetric modulated arc therapy / Radiother. Oncol 117:407~411
Nithiyanantham K / 2015 / Analysis of direct clinical consequences of MLC positional errors in volumetric-modulated arc therapy using 3D dosimetry system / J. Appl. Clin. Med. Phys 16(5):296~305
Liang B / 2016 / Comparisons of volumetric modulated arc therapy (VMAT) quality assurance (QA) systems:sensitivity analysis to machine errors / Radiat. Oncol 11:146
Sjölin M / 2016 / Incorrect dosimetric leaf separation in IMRT and VMAT treatment planning: Clinical impact and correlation with pretreatment quality assurance / Phys. Medica 32:918~925
Paslera M / 2015 / Linking log files with dosimetric accuracy – A multi-institutional study on quality assurance of volumetric modulated arc therapy / Radiother. Oncol 117:407~411
Nithiyanantham K / 2015 / Analysis of direct clinical consequences of MLC positional errors in volumetric-modulated arc therapy using 3D dosimetry system / J. Appl. Clin. Med. Phys 16(5):296~305
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